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 2/24
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.
Monday, February 17, 2014
Wednesday, February 12, 2014
Monday, February 10, 2014
2/10 physics update and homework due 2/17
Hi Folks,
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.
Tuesday, February 4, 2014
2-3 physics update and homework due 2/10
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?
Tuesday, January 28, 2014
Monday, January 27, 2014
1/27 Physics update and Homework due 2/3
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. :)
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. :)
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
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