The document contains questions and answers about concepts related to gravity, projectiles, and Newton's laws of motion. Some of the key points covered include: - Satellites need to be above the atmosphere to avoid air resistance. - The maximum projectile distance is achieved at a 45 degree angle. - Gravity accelerates objects at 9.8 m/s^2 near Earth's surface. - Newton's three laws of motion explain forces like inertia, acceleration, and action-reaction pairs between objects in contact.

1. 2 pt 3 pt 4 pt 5pt 1 pt 2 pt 3 pt 4 pt 5 pt 1 pt 2pt 3 pt 4pt 5 pt 1pt 2pt 3 pt 4 pt 5 pt 1 pt 2 pt 3 pt 4pt 5 pt 1pt Gravity and Projectiles Potpourri Newton’s 1st Newton’s 2nd Newton’s 3rd

2. Why is it important that a satellite be above earth’s atmosphere?

3. So it won’t encounter air resistance

4. At what angle should a slingshot be oriented to achieve maximum distance?

5. 45 degrees

6. What is the acceleration of Gravity? (Rounded to the nearest tenth)

7. 9.8 m/s

8. A ball is thrown straight up at 30m/s, about how long will it be in the air?

9. 6 seconds

10. Given d=1/2at 2 How far will an object have fallen if it was dropped from a plane 16 seconds ago?

11. 480m

12. The kilogram is a measure of an object’s:

13. Mass

14. This gives you both the magnitude and direction of velocity

15. What is a velocity vector?

16. This force ensures that an object, whether rolled or thrown will always come to a stop.

17. What is friction?

18. Who is the coolest teacher ever?

19. Mr. Coffeen

20. How much does one kilogram weigh in Newtons?

21. 9.8N or 10N

22. This is the force that is explained by Newton’s First Law

23. What is inertia?

24. Inertia applies to bodies at rest and:

25. Bodies in constant motion

26. If a body has twice the inertia of another body, it also has twice the_____

27. Mass of the other body

28. A large man and a small woman are on a train that makes a sudden stop. The woman falls forward but the man keeps his footing. Who had more inertia?

29. The large man

30. Does a bowling ball have more inertia on the Earth or on the Moon?

31. The same both places

32. What equation do we use to describe Newton’s Second Law?

33. F=ma

34. 10kg brick and a 1kg brick are dropped in a vacuum, the force of gravity on the 10kg brick is:

35. 10 times as much

36. An object is pulled northward at 20N and southward at 15N. What magnitude of the net force?

37. 5N

38. A 1000kg truck is accelerated at 8m/s/s, how much force was applied to do so?

39. 8000N

40. Convert this equation into the force gravity exerts on earth: F=ma

41. F=ga Or F=10a Or F=9.8a

42. Paraphrase Newton’s Third Law

43. Every action has an equal and opposite reaction

44. A high school student hits a nail with a hammer. During the collision there is a force on which object?

45. Both nail and hammer

46. A boxer swings as hard as he can at a helium balloon then equally hard at a punching bag. Which object did he hit with more force?

47. The punching bag

48. An archer shoots an arrow. Consider the action force to be the bowstring pushing against the arrow. The reaction force is:

49. The arrow pushing against the bowstring

50. A rocket is able to propel itself in in the vacuum of space by firing its engines. The force that propels the rocket is:

51. The exhaust gasses rushing away from the ship