Hi folks,
Today we investigated simple machines and their relation to work. We did some work with pulleys and levers and discovered the inverse relationship between distance and force.
For homework:
Read the lever and pulley chapters in the Bite-Size Physics book I've attached to this email.
Answer the questions at the end of each chapter.
Also, answer the following questions.
Create the graph I've included below and use that to 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?
Answer the following questions as well.
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?
Last, Due MONDAY: Take two pictures that give a real world example of each of the following concepts. So, 10 pictures in all. You can email these to me or bring them to class.
Newton's First Law
Newton's Second Law
Newton's Third Law
Momentum
Impulse
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