Lesson 4: What are the laws of motion? - be011.k12.sd.us

[Pages:4]Ch. 15: Forces and Motion Lesson 4: What are the laws of motion?

1. Name 2 scientists who studied motion.

2. State Newton's 1st Law of Motion.

3. What happens to an object at rest if two balanced forces act on it?

4. Why does a kicked soccer ball eventually quit moving?

5. Define inertia.

6. Which has greater inertia, a beach ball or a bowling ball? Explain.

7. It takes 3 people to get a heavy object to start moving, but once it's moving it only takes 2 people to keep it moving. Why?

Ch. 15: Forces and Motion Lesson 4: What are the laws of motion?

8. An object moves in circular path at a constant speed. Are the forces on the object balanced? Explain.

9. State Newton's 2nd Law.

10. The same unbalanced force is applied to objects A, B, and C. Object B has the greatest acceleration, and object A the least. Rank the masses of the three objects.

11. Suppose you are riding on a bicycle. You stop to place a heavy object on the back of the bike. How will the increased mass affect the bike's acceleration if you pedal with the same force? Explain.

12. Write the equation for Newton's 2nd Law.

Ch. 15: Forces and Motion Lesson 4: What are the laws of motion?

13. An object has a mass of 12 kg. A force of 36 N is applied to it. What is the objects acceleration?

14. A ball with a mass of .2 kg is kicked with a force of 5 N. What is the balls acceleration?

15. State Newton's 3rd Law.

16. Why does a rubber ball bounce?

17. For every ______ there is an equal and opposite ______.

18. Give some examples of the statement in #17.

19. You apply a force to a soccer ball when you kick it. Compare this force to the force that the soccer ball exerts on your foot.

Ch. 15: Forces and Motion Lesson 4: What are the laws of motion?

20. A ball rolls down a lane and strikes a pin. Which is greater, the force of the ball on the pin or the force of the pin on the ball? Explain.

21. Define momentum.

22. Which has greater momentum, a car sitting still or a pebble rolling down a hill? Explain.

23. State the law of conservation of momentum.

24. In a game of pool, the six-ball collides with the tenball, which was originally at rest. The collision causes the six-ball to stop. Predict the motion of the ten-ball after the collision, assuming both balls have the same mass.

25. An adult and a child are ice skating. The child pushes away from the adult. The child moves backward. What will happen to the adult?

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