Hi folks,
I've change the syllabus a bit. We were not able to spend time with Goal 8, static electricity, so I've removed it from the syllabus. Sorry for the confusion.
Jim Mueller
Wednesday, June 18, 2014
Physics Syllabus for the 2013 - 2014 School Year
Hi folks,
Here is the complete syllabus for what we covered in physics.
Thank you for being a part of class this year.
I hope you all have a wonder-filled summer.
Sincerely,
Jim Mueller
Here is the complete syllabus for what we covered in physics.
Thank you for being a part of class this year.
I hope you all have a wonder-filled summer.
Sincerely,
Jim Mueller
Wednesday, May 14, 2014
Some help with Ray Diagrams for Physics
Hi folks,
These websites do a very nice job explaining ray diagrams and how to draw them. There are videos as well.
Convex Mirrors http://www.physicsclassroom.com/class/refln/Lesson-4/Ray-Diagrams-Convex-Mirrors
Concave Mirrors http://www.physicsclassroom.com/class/refln/Lesson-3/Ray-Diagrams-Concave-Mirrors
Convex Lenses http://www.physicsclassroom.com/class/refrn/Lesson-5/Converging-Lenses-Ray-Diagrams
Concave Lenses http://www.physicsclassroom.com/class/refrn/Lesson-5/Diverging-Lenses-Ray-Diagrams
Jim Mueller
These websites do a very nice job explaining ray diagrams and how to draw them. There are videos as well.
Convex Mirrors http://www.physicsclassroom.com/class/refln/Lesson-4/Ray-Diagrams-Convex-Mirrors
Concave Mirrors http://www.physicsclassroom.com/class/refln/Lesson-3/Ray-Diagrams-Concave-Mirrors
Convex Lenses http://www.physicsclassroom.com/class/refrn/Lesson-5/Converging-Lenses-Ray-Diagrams
Concave Lenses http://www.physicsclassroom.com/class/refrn/Lesson-5/Diverging-Lenses-Ray-Diagrams
Jim Mueller
Wednesday, May 7, 2014
Tuesday, May 6, 2014
5/5 Physics update and homework due 5/12
Hi folks,
This week we spent a large amount of time taking another look at ray diagrams. Last week's quiz was difficult for most folks so I took the time this week do more with lenses, mirrors and ray diagrams.
We also took a bit of time to talk about the very strange world of the speed of light. Reality gets quite weird as things approach the speed of light and we had a small amount of time to take a look at that.
Next week is our last week to meet other than the final and I'd like to allow time for questions and review. For homework this week, please spend time looking over your old quizzes. Bring any questions you may have to class next week for us all to take a look at. Remember, there are no dumb questions. If you feel uncertain about something, it's almost guaranteed someone else in class has the same issue…and they may not even know it.
Feel free to email me if you need some help as well.
See you all next week.
Science Jim
This week we spent a large amount of time taking another look at ray diagrams. Last week's quiz was difficult for most folks so I took the time this week do more with lenses, mirrors and ray diagrams.
We also took a bit of time to talk about the very strange world of the speed of light. Reality gets quite weird as things approach the speed of light and we had a small amount of time to take a look at that.
Next week is our last week to meet other than the final and I'd like to allow time for questions and review. For homework this week, please spend time looking over your old quizzes. Bring any questions you may have to class next week for us all to take a look at. Remember, there are no dumb questions. If you feel uncertain about something, it's almost guaranteed someone else in class has the same issue…and they may not even know it.
Feel free to email me if you need some help as well.
See you all next week.
Science Jim
Sunday, May 4, 2014
Physics Final Exam on May 20
Hi folks,
Just a reminder that we have two more classes and then the final exam.
To prepare for the final, I would highly recommend taking a look at all your old quizzes. The final exam will be based on the same material those quizzes were based on. Be sure to go over all questions that you may have missed and be sure to understand them so that you'll be ready for the exam. If you have trouble understanding where you went wrong, there's a good chance the material was covered in a recording and you can also email me if you need help. Feel free to ask questions at the beginning or end of class as well.
I'll provide all formulas and constants so you will not need to worry about memorizing anything.
Good luck everyone!
Never Stop Wondering,
Science Jim
Just a reminder that we have two more classes and then the final exam.
To prepare for the final, I would highly recommend taking a look at all your old quizzes. The final exam will be based on the same material those quizzes were based on. Be sure to go over all questions that you may have missed and be sure to understand them so that you'll be ready for the exam. If you have trouble understanding where you went wrong, there's a good chance the material was covered in a recording and you can also email me if you need help. Feel free to ask questions at the beginning or end of class as well.
I'll provide all formulas and constants so you will not need to worry about memorizing anything.
Good luck everyone!
Never Stop Wondering,
Science Jim
Friday, May 2, 2014
4/27 Physics Video: Color
Begin forwarded message:
From: YouTube <noreply@youtube.com>Subject: Congrats, your video is now on YouTube!Date: May 2, 2014 at 8:03:01 AM EDTTo: Jim Mueller <Sciencejim@gmail.com>
Your video is now on YouTube.
Physics week 29 Color
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Wednesday, April 30, 2014
Tuesday, April 29, 2014
4/29 Physics Update and Homework due 5/6
Hi folks,
Today we spent some time looking at the ray diagrams associated with convex and concave mirrors. After that we spent the rest of the class taking a look at how color works. We took a look at additive and subtractive colors and how three colors make up all the colors that we can see.
Homework for this week is to:
Read pg. 421 - 438 in the Conceptual Physics book
Do Review Questions #'s 2 - 25
Today we spent some time looking at the ray diagrams associated with convex and concave mirrors. After that we spent the rest of the class taking a look at how color works. We took a look at additive and subtractive colors and how three colors make up all the colors that we can see.
Homework for this week is to:
Read pg. 421 - 438 in the Conceptual Physics book
Do Review Questions #'s 2 - 25
Tuesday, April 22, 2014
4/22 Physics update and homework due 4/29
Hi folks,
In today's class, we got into ray diagrams and spent a good amount of time drawing them for convex and concave lenses. We spent some time on mirrors as well.
Homework due 4/29
Read Conceptual Physics pgs 463-476
Do Review Questions #'s 1 - 3
Do Think and Explain #'s 1 - 12
In today's class, we got into ray diagrams and spent a good amount of time drawing them for convex and concave lenses. We spent some time on mirrors as well.
Homework due 4/29
Read Conceptual Physics pgs 463-476
Do Review Questions #'s 1 - 3
Do Think and Explain #'s 1 - 12
Thursday, April 10, 2014
4/9 Physics update and homework due 4/23
Hi folks,
Today we began our discussion on light by taking a look at the electromagnetic spectrum, and exploring how light refracts as it goes through lenses and liquids. We will do more with light during our next class session.
Remember, no class next week due to Spring Break.
Homework due 4/23 is to:
Read pgs. 442 - 459
Do review questions on pg. 460 #'s 13 - 23
Do Think and Explain questions on pg. 462 #'s 8 - 10
Thursday, April 3, 2014
Message from Science Jim on homework for this week (4/1)
Science Jim is having computer problems so he asked me to send everyone his response to my email about this week's homework.
> Sorry about the homework for this week. My other computer has everyone's email addresses on it and at this point it's still not working right. Since i'm not sure when I'll be able to make that happen, let's just say no homework for this week.
>
> Congratulations! :)
> Science Jim
Madison Cross Sugg
mcsugg@mac.com
> Sorry about the homework for this week. My other computer has everyone's email addresses on it and at this point it's still not working right. Since i'm not sure when I'll be able to make that happen, let's just say no homework for this week.
>
> Congratulations! :)
> Science Jim
Madison Cross Sugg
mcsugg@mac.com
Wednesday, March 26, 2014
Tuesday, March 25, 2014
Chapter for homework
Hi folks,
The chapter I assigned for homework is not in the original .pdf I gave you. I thought I had given you the full book. Here's the chapter.
.
The chapter I assigned for homework is not in the original .pdf I gave you. I thought I had given you the full book. Here's the chapter.
.
3/25 physics update and homework due 4/1
Hi folks,
This week we worked on the concept of resonance. Resonance is when energy is transferred by a wave of a certain frequency causing something with a similar frequency to vibrate. It is the way energy can be transferred by waves. We did a variety of demonstrations to explore this concept.
Homework for this week, is to read the Resonance chapter in the Bite-Size Physics eBook and do the questions at the end of the chapter.
This week we worked on the concept of resonance. Resonance is when energy is transferred by a wave of a certain frequency causing something with a similar frequency to vibrate. It is the way energy can be transferred by waves. We did a variety of demonstrations to explore this concept.
Homework for this week, is to read the Resonance chapter in the Bite-Size Physics eBook and do the questions at the end of the chapter.
Tuesday, March 18, 2014
Recording of Physics Class week 24
Your video is now on YouTube.
Physics week 24
3/18 Physics update and homework for 3/25
Hi folks,
Today we spent a bit more time mastering some of the math from the past weeks. The quizzes pointed to some issues in solving the energy problems and conservation of momentum problems so we spent more time explaining them and doing some examples in class.
We also spent a bit of time finding the relationship between the tension of a slinky and the velocity of a wave.
For homework due next week do the enclosed .pdf.
Today we spent a bit more time mastering some of the math from the past weeks. The quizzes pointed to some issues in solving the energy problems and conservation of momentum problems so we spent more time explaining them and doing some examples in class.
We also spent a bit of time finding the relationship between the tension of a slinky and the velocity of a wave.
For homework due next week do the enclosed .pdf.
Physics Class is on for today
Hi folks,
From what I've heard it looks like folks can make it so we will be having class today at the usual time.
See you all soon.
Jim Mueller
From what I've heard it looks like folks can make it so we will be having class today at the usual time.
See you all soon.
Jim Mueller
Wednesday, March 12, 2014
Physics recording week 22 Waves
Your video is now on YouTube.
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3/11 Physics update and homework due 3/18
Hi folks,
Today we spent quite a bit more time reviewing some energy math problems. This is fairly tough and the quizzes seemed to indicate it could use a bit more work. We also got a bit deeper into waves and actually used the formula Velocity = Wavelength x Frequency to determine the velocity of a Slinky wave.
Homework for this week is to:
Do the Think and Explain Questions on page 388 of the Conceptual Physic book #'s 1-5
Do the think and solve problems on page 399 #'s 1 - 4
Also, work through the bowling ball problem that you did for the quiz today at home. It certainly looks like many of you may want to spend a bit more time on this. Please hand these questions in next week as well. The answers are at the bottom so that you can be sure you get them right. This question will keep reappearing in different forms on the quizzes and so it is in your best interest to get this material down pat.
EXTRA CREDIT: Find a swing and figure out the frequency and period of the swing.
EXTRA CREDIT: Go to a pond or a pool and find the frequency, wavelength and velocity of some water waves you create.
A bowling ball is rested on top of one of those ramps at the 19m (62 ft) bowling lane. If the ball has a mass of 7lbs (3kg) and the top of the ramp is 1m off the ground…
a. what speed will the ball have at the bottom of the ramp?
b. if the ball is going at 3m/s by the time it hits the pins, what's the friction force of the alley?
c. what energy did the ball lose going down the alley?
d. whats the energy efficiency of the ball/alley combo?
e. if the ball comes to a rest after hitting 1 pin, what energy did that pin get?
A bowling ball is rested on top of one of those ramps at the 19m (62 ft) bowling lane. If the ball has a mass of 7lbs (3kg) and the top of the ramp is 1m off the ground…
a. what speed will the ball have at the bottom of the ramp?
4.5
b. if the ball is going at 3m/s by the time it hits the pins, what's the friction force of the alley?
.9N
c. what energy did the ball lose going down the alley?
16.5J
d. whats the energy efficiency of the ball/alley combo?
45%
e. if the ball comes to a rest after hitting 1 pin, what energy did that pin get?
13.5
Today we spent quite a bit more time reviewing some energy math problems. This is fairly tough and the quizzes seemed to indicate it could use a bit more work. We also got a bit deeper into waves and actually used the formula Velocity = Wavelength x Frequency to determine the velocity of a Slinky wave.
Homework for this week is to:
Do the Think and Explain Questions on page 388 of the Conceptual Physic book #'s 1-5
Do the think and solve problems on page 399 #'s 1 - 4
Also, work through the bowling ball problem that you did for the quiz today at home. It certainly looks like many of you may want to spend a bit more time on this. Please hand these questions in next week as well. The answers are at the bottom so that you can be sure you get them right. This question will keep reappearing in different forms on the quizzes and so it is in your best interest to get this material down pat.
EXTRA CREDIT: Find a swing and figure out the frequency and period of the swing.
EXTRA CREDIT: Go to a pond or a pool and find the frequency, wavelength and velocity of some water waves you create.
A bowling ball is rested on top of one of those ramps at the 19m (62 ft) bowling lane. If the ball has a mass of 7lbs (3kg) and the top of the ramp is 1m off the ground…
a. what speed will the ball have at the bottom of the ramp?
b. if the ball is going at 3m/s by the time it hits the pins, what's the friction force of the alley?
c. what energy did the ball lose going down the alley?
d. whats the energy efficiency of the ball/alley combo?
e. if the ball comes to a rest after hitting 1 pin, what energy did that pin get?
A bowling ball is rested on top of one of those ramps at the 19m (62 ft) bowling lane. If the ball has a mass of 7lbs (3kg) and the top of the ramp is 1m off the ground…
a. what speed will the ball have at the bottom of the ramp?
4.5
b. if the ball is going at 3m/s by the time it hits the pins, what's the friction force of the alley?
.9N
c. what energy did the ball lose going down the alley?
16.5J
d. whats the energy efficiency of the ball/alley combo?
45%
e. if the ball comes to a rest after hitting 1 pin, what energy did that pin get?
13.5
Tuesday, March 4, 2014
3-4 Physics update and homework due 3/11
Hi folks,
Today we spent time studying waves and the definitions of the properties of waves. We went outside and, with a rope, did a bit of a hands-on experience getting to understand frequency, amplitude and wavelength.
Homework for this week is to:
Read pp. 372 - 379 in the Conceptual Physics book
Do Review Questions pg. 387 #'s 1 - 11
Do Plug and Chug 1-5
Today we spent time studying waves and the definitions of the properties of waves. We went outside and, with a rope, did a bit of a hands-on experience getting to understand frequency, amplitude and wavelength.
Homework for this week is to:
Read pp. 372 - 379 in the Conceptual Physics book
Do Review Questions pg. 387 #'s 1 - 11
Do Plug and Chug 1-5
Physics class today?
Hi folks,
Just checking in on how folks feel about physics class today. It's supposed to be 33 at noon and 36 by the time class begins. Not a lot of time for melt if it's icy by you. I feel that I can make it but I'm wondering about others. Please let me know as soon as you can.
Thanks,
Science Jim
Just checking in on how folks feel about physics class today. It's supposed to be 33 at noon and 36 by the time class begins. Not a lot of time for melt if it's icy by you. I feel that I can make it but I'm wondering about others. Please let me know as soon as you can.
Thanks,
Science Jim
Thursday, February 27, 2014
Correction for the physics homework
Hi folks,
Question 2. C. asks for the amount of work that friction does. It should ask for the amount of force applied to the sled. Sorry for the confusion there.
Jim Mueller
Question 2. C. asks for the amount of work that friction does. It should ask for the amount of force applied to the sled. Sorry for the confusion there.
Jim Mueller
Tuesday, February 25, 2014
2/25 physics class and homework due 3/4
Hi folks,
Today our future physicists under took a little mechanical engineering task. I gave them the task to create the most energy efficient vehicle that they could. Using a variety of materials, they were to create a vehicle that uses as much of the energy they gave it as efficiently as possible. They had to measure the energy they put into the vehicle (primarily gravitational potential energy) and the energy out and figure out how energy efficient their vehicle was.
Homework for 3/4 is to do the enclosed questions. I've included the answers to the Olympic energy questions to help you study.
Also, do the math for today's lab and hand that in next week as well.
1. Thinking about the energy formulas, tell me if it make sense to have a heavy vehicle or a light vehicle as far as gPE goes.
2. If you created a balloon car, would you want it to be heavy? Why or why not?
3. If you and a friend were on identical sleds and your friend weighs twice as much as you do, which of you would go farther? Which of you would have more velocity? Describe this in relation to momentum and describe this in relation to energy.
Use these formulas to solve the following Olympic energy problems. Answers below.
gPE = MgH
KE = ½ MV^2 (^2 means squared)
W = FD
1. A ski jumper who has a mass of 70 kg stands at the top of a ski jump that is 20m tall.
a. What is his potential energy?
b. If there's no friction, what would his speed be as he launches from the jump?
c. If his speed is 14 m/s, what is the energy efficiency of the ramp?
d. What work did friction do on our ski hero?
e. What was the average force of friction between the ramp and his skis if he travels
75 m down the ramp
2. a. If the Jamaican bob sled with a mass of 300 kg reaches a top speed of 150 km/h (42 m/s), what was the least amount of energy the bob sled started with?
b. What was the lowest height the bob sled started at?
c. If the track is 2200m long, what work did friction do on our Jamaican bob sledders by the time the team comes to a complete rest at the bottom?
d. If the height of the track was really 200 m, what was the energy efficiency of the bob sled?
1. a. gPE = Mgh
70kg x 20 m x 10 m/s^2 = 14,000J
70kg x 20 m x 10 m/s^2 = 14,000J
b. KE = ½ MV^2
14,000 J = ½ 70 kg x v^2
v = 20 m/s
c. KE = ½ 70kg x (14)^2
KE = 6860 J
Work out/ Work in x 100
6860/14000 x 100 = 49% Efficient
d. 14,000J - 6860J = 7140 J
e. W = FD
7140J = F x 75m
F = 95.2 N
2. a. KE = ½ MV^2
KE = ½ 300kg (42 m/s)^2
KE = 264,600 J
b. gPE = MgH
264,600 = 300kg x 10m/s^2 x H
H = 88.2 m
c. W = FD
264,600 J = F x 2200 m
F = 120.27 N
d. gPE = MgH
gPE = 300 kg x 10 m/s^2 x 200 m
gPE = 600,000 J That's the maximum amount of energy. Since their energy was 264,600 J their energy efficiency was…
Work out / Work in x 100
264,600/ 600,000 x 100 = 44%
Monday, February 24, 2014
Payment for Science Classes
Hi folks,
Just a reminder, that payment is due for the final session of classes. The cost is $250 for the full 2 hour class and $180 for the 1.5 hour class.
If you wish to mail your payments, my address is 3105 Whitfield Rd. Chapel Hill, NC 27514.
I hope everyone is enjoying this wonderful spring-like weather.
Jim Mueller
Just a reminder, that payment is due for the final session of classes. The cost is $250 for the full 2 hour class and $180 for the 1.5 hour class.
If you wish to mail your payments, my address is 3105 Whitfield Rd. Chapel Hill, NC 27514.
I hope everyone is enjoying this wonderful spring-like weather.
Jim Mueller
Tuesday, February 18, 2014
Recording of Physics week 21: Working with Energy Formulas
This is short since most of the class was lab work.
Your video is now on YouTube.
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2/18 Physics class update and homework due 2/25
Hi folks,
Today we began the next part of our energy unit with is energy in motion, in other words, waves. Today we worked on the concept of frequency and hertz.
In order to work with this, the students created 3 pendulums. One of which had a frequency of .5 Hz, one had a frequency of 1 Hz and the last had a frequency of 2 Hz. From their data, they then predicted what length of string would have a frequency of 1.5 Hz.
Extra Credit possibility. Continue working with pendulums and do a lab exploring one of the many variables you thought of today during class. For example, changing the weight of the bob. Does the height of the swing matter? Does interference of the swing matter.
Homework due 2/25
Read Conceptual Physics pgs 103-118
Do Review Questions pg 119 and 120 #'s 7-12, 18 and 20
Do Plug and Chug pg 120 #'s 4-7
Do Think and Explain pg 120 and 121 #'s 2 and 3.
Today we began the next part of our energy unit with is energy in motion, in other words, waves. Today we worked on the concept of frequency and hertz.
In order to work with this, the students created 3 pendulums. One of which had a frequency of .5 Hz, one had a frequency of 1 Hz and the last had a frequency of 2 Hz. From their data, they then predicted what length of string would have a frequency of 1.5 Hz.
Extra Credit possibility. Continue working with pendulums and do a lab exploring one of the many variables you thought of today during class. For example, changing the weight of the bob. Does the height of the swing matter? Does interference of the swing matter.
Homework due 2/25
Read Conceptual Physics pgs 103-118
Do Review Questions pg 119 and 120 #'s 7-12, 18 and 20
Do Plug and Chug pg 120 #'s 4-7
Do Think and Explain pg 120 and 121 #'s 2 and 3.
Thursday, February 13, 2014
PDF for homework
Here's the .pdf for the homework this week. It seems to have not attached last time.
Physics update for 2/11 and homework due 2/18
Hi Folks,
Sorry about how late this is. I thought I sent this out on Tuesday night.
Today we got into the concept of Potential and Kinetic energy and how they change into each other. We also discussed energy efficiency and conservation of energy.
For homework this week:
Find the energy the ramp stole from the ball (if you haven't already finished that in class).
Find the energy efficiency of the ramp. Take the work out (the energy the box was hit with) divided by the work in (the potential energy the ball started with) and multiply that by 100 to convert it to a percentage.
Read the Potential and Kinetic Energy chapter in the eBook
Open the following simulation and use it to answer the following questions in the .pdf.
Wednesday, February 12, 2014
Tuesday, February 4, 2014
2/4 Physics update and homework due 2/11
Hi folks,
Today we continued our investigation into simple machines and their relation to work. We did some work with pulleys and discovered the inverse relationship between distance and force.
For homework this week:
Read the pulley chapter in the book.
Take a look at the enclosed .pdf and do all the questions at the end.
Also, answer the following questions.
1. With the pulleys, how did work out relate to work in?
2. With the levers, did work out relate to work in? It should have. So what wasn't measured that caused work out to not relate to work in in the same way as the pulleys?
3. What relationship did force have in regards to distance as you worked with the pulleys?
4. As you increased the number of pulleys, what effect did that have on the effort force? What effect did it have on the effort distance?
5. a. If you were lifting a load that required a force of 10N with one pulley, what effort force would be required?
b. Same question, but now you're using 2 pulleys?
c. How about 10 pulleys?
6. a. If you were lifting that load 1 meter, what would the work in distance be for one pulley?
b. 2 pulleys?
c. 10 pulleys?
Today we continued our investigation into simple machines and their relation to work. We did some work with pulleys and discovered the inverse relationship between distance and force.
For homework this week:
Read the pulley chapter in the book.
Take a look at the enclosed .pdf and do all the questions at the end.
Also, answer the following questions.
1. With the pulleys, how did work out relate to work in?
2. With the levers, did work out relate to work in? It should have. So what wasn't measured that caused work out to not relate to work in in the same way as the pulleys?
3. What relationship did force have in regards to distance as you worked with the pulleys?
4. As you increased the number of pulleys, what effect did that have on the effort force? What effect did it have on the effort distance?
5. a. If you were lifting a load that required a force of 10N with one pulley, what effort force would be required?
b. Same question, but now you're using 2 pulleys?
c. How about 10 pulleys?
6. a. If you were lifting that load 1 meter, what would the work in distance be for one pulley?
b. 2 pulleys?
c. 10 pulleys?
Thursday, January 30, 2014
Graph for Physics class
Hi folks,
Here's a template to help you get started on the graph for the homework this week. The vertical axis is the force it took to lift the pennies, the effort force. The horizontal axis is the distance that the fulcrum was from the load. Let me know if you have any questions.
Tuesday, January 28, 2014
1/28 Physics class and homework due 2/4
Hi folks,
Today we talked about about human energy and how humans get and use energy in the form of calories.
We also did a bit of work with simple machines and did a lab using the lever.
Homework this week is to answer the questions in this email and
Read the Levers chapter in the Bite-Size Physics book I sent and do all 5 questions at the end of the chapter. Please use the answers as reference only! Answer them yourself first. :)
Create the graph we talked about in class and using that graph answer the following questions.
1. What happened to the effort force as the fulcrum got closer to the load?
2. What happened to the effort force as the fulcrum got farther from the load?
3. What happened to the load force as the fulcrum got closer to the load?
4. How about when the fulcrum got farther from the load?
5. If you wanted to lift an object that you couldn't lift by yourself, where would you put the fulcrum? Close to, or far from the load?
6. What relationship does distance have to force in regards to the lever?
Today we talked about about human energy and how humans get and use energy in the form of calories.
We also did a bit of work with simple machines and did a lab using the lever.
Homework this week is to answer the questions in this email and
Read the Levers chapter in the Bite-Size Physics book I sent and do all 5 questions at the end of the chapter. Please use the answers as reference only! Answer them yourself first. :)
Create the graph we talked about in class and using that graph answer the following questions.
1. What happened to the effort force as the fulcrum got closer to the load?
2. What happened to the effort force as the fulcrum got farther from the load?
3. What happened to the load force as the fulcrum got closer to the load?
4. How about when the fulcrum got farther from the load?
5. If you wanted to lift an object that you couldn't lift by yourself, where would you put the fulcrum? Close to, or far from the load?
6. What relationship does distance have to force in regards to the lever?
Tuesday, January 21, 2014
1/21 physics update and homework due 1/28
Hi folks,
Last week we did a nice conceptual overview of what energy is and this week we got a bit more into the nitty gritty and mathematics behind energy. We introduced the concept that energy is the ability to do work and that work is equal to force times distance. To make that more concrete, we went outside and pushed my car again. This time, however, we measured the amount of force it took to move the car and measured how much time it took to move it. Using those measurements we calculated the energy it took for us to move the car and we found how many Watts and how much horsepower we used.
In my opinion the text that we're using goes into too little detail on energy. I'm including my Energy eBook to help supplement the text
Homework for due 1/28 is to
Read pp 103 and 104
Read the Energy and Work chapter in the eBook
Do Review Questions on page 119 #'s 1 - 5
Plug and Chug Pg 120 #'s 1 and 3
Think and Solve # 2, 4
Also, do the "Find the Power" experiment in the eBook. We did the first part where you find your wattage in class. (Email me if you can't remember your wattage.) Compare yourself to at least 5 different appliances.
Last week we did a nice conceptual overview of what energy is and this week we got a bit more into the nitty gritty and mathematics behind energy. We introduced the concept that energy is the ability to do work and that work is equal to force times distance. To make that more concrete, we went outside and pushed my car again. This time, however, we measured the amount of force it took to move the car and measured how much time it took to move it. Using those measurements we calculated the energy it took for us to move the car and we found how many Watts and how much horsepower we used.
In my opinion the text that we're using goes into too little detail on energy. I'm including my Energy eBook to help supplement the text
Homework for due 1/28 is to
Read pp 103 and 104
Read the Energy and Work chapter in the eBook
Do Review Questions on page 119 #'s 1 - 5
Plug and Chug Pg 120 #'s 1 and 3
Think and Solve # 2, 4
Also, do the "Find the Power" experiment in the eBook. We did the first part where you find your wattage in class. (Email me if you can't remember your wattage.) Compare yourself to at least 5 different appliances.
Wednesday, January 15, 2014
Link to Phet Sim for Physics homework
Hi folks,
Sorry, I forgot to include the link for the sim. Here you go. http://phet.colorado.edu/en/simulation/collision-lab
Sorry, I forgot to include the link for the sim. Here you go. http://phet.colorado.edu/en/simulation/collision-lab
Tuesday, January 14, 2014
1/14 Physics update and Homework due 1/21
Hi folks,
We have started our energy block today. We discussed how we perceive energy using our energy "antennae", our ears, eyes and skin. We also discussed how energy is like a phantom. It's invisible until it interacts with matter, it changes forms and it can neither be created nor destroyed.
Homework for this week is to do the enclosed .pdf. This is another exercise with a PHET simulation. There still seems to be some confusion with conservation of momentum so this well help to nail down that concept. Besides….it's kinda fun! :)
We have started our energy block today. We discussed how we perceive energy using our energy "antennae", our ears, eyes and skin. We also discussed how energy is like a phantom. It's invisible until it interacts with matter, it changes forms and it can neither be created nor destroyed.
Homework for this week is to do the enclosed .pdf. This is another exercise with a PHET simulation. There still seems to be some confusion with conservation of momentum so this well help to nail down that concept. Besides….it's kinda fun! :)
Recording of Week 17 class: Introduction to Energy
Your video's now on YouTube.
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