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```							Physics Alive with Paul Hewitt       Name __________________________________Period_________
Chapter 4 Newton’s First Law

Students talking during this video presentation will have 5 points automatically deducted from this assignment
each time they disrupt the class. All responses must be in complete sentences.

The law of inertia and the concept of mass are introduced and supported with a variety of examples and
demonstrations. The concepts of weight, cancellation of forces, and net force are also illustrated.

1. What does Paul Hewitt use an anvil to demonstrate?

2. What did Aristotle realize about motion?

3. How did Galileo describe motion?

4. What is the Law of Inertia?

5. What does a straight line path at a constant speed imply about an objects velocity?

6. What does Paul demonstrate by suspending two clay balls over his head with a coat hanger?

7. How is mass related to inertia?

8. What is the difference between mass and weight?

9. The heavy cylinder that Paul places on the table is pulled down by the force of gravity. Why doesn’t it
move in a straight line?

10. What is a net force?
11. What is the acceleration of a moving object if no net force is applied to it?

12. How is acceleration different from inertia?

13. What is Paul demonstrating when he suspends a heavy ball by a string and then pulls on the string below
the heavy ball?

14. Why is Paul not crushed when the student hits the anvil with a sledge hammer?

15. What is the net force of any object in equilibrium?

16. If you weigh 150 pounds and distribute your weight equally between two bathroom scales, how much

17. Harry, a painter, is suspended in a bosun’s chair by two ropes. What is the tension in each rope?

18. If Harry ties one rope to a flagpole so that only the remaining rope supports him, what is the tension in
that rope?

```
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