1. Newton’s Laws of Motion: Review Chapters 4-6 November 9/10

2. Question When a balloon deflates, the balloon pushes on the air and _______.

3. Answer The air pushes on the balloon

4. Question Object one has twice as much mass as another object. Object one also has twice as much _____

5. Answer Inertia

6. Questions When all the forces acting on an object are balanced and the net force is zero, the object is said to be in ___________.

7. Answer Equilibrium

8. Questions Accelerations are produced by

9. Answer Forces

10. Question A book weighs 4 N. When held at rest in your hands, the net force on the book is ____.

11. Answer Zero

12. Question Which has a greater mass, a kilogram of feathers or a kilogram of steel?

13. Answer The both have the same mass, 1 kg

14. Question As a ball falls, the action force is the pull of Earth's mass on the ball. What is the reaction to this force?

15. Answer The pull of the ball’s mass on the Earth

16. Question The outside force that often slows objects down or stops their motion is ___.

17. Answer Friction

18. Question If you push off the ground with a force of 500 N when you jump upward, what force pushes Earth downward?

19. Answer 500 N according the Newton’s 3 rd law

20. Question What is the pressure exerted on a table by a book that weighs 35 N and covers an area of 3 m 2 ?

21. Answer Known F = 35 N A = 3 m 2 Unknown P Equation P = F A Solve P = 35 N 3m 2 P = 11.67 N/m 2 or 11.67 Pa

22. Questions- honors With what acceleration does an 65 kg box move if it is pushed 155 N?

23. Answer Known m = 65 kg F = 155 N Unknown a = ? Equation F = ma Solve F = ma 155N = (65kg)a 155 = (65kg)a 65kg 2.38 m/s 2

24. Question A dog walks on a street. What is the force of friction between the 225 N dog and the street that has a coefficient of friction of 0.26?

25. Answer Known w = 225 N = F N µ = 0.26 Unknown F f = ? Equation F f = µF N Solve F f = µF N F f = (0.26)(225N) F f = 58.5 N

26. Question Force and accelerations are ______________ proportional.

27. Answer Directly proportional – More force results in more acceleration

28. Question Mass and acceleration are __________________ proportional.

29. Answer Inversely proportional – More mass results in less acceleration – Less mass results in more acceleration

30. Question Pressure and Area are _______________ proportional.

31. Answer Inversely proportional – More area covered results in less pressure – Less area covered results in more pressure

32. Question Which has greater tangential speed, a horse near the outside rail of a merry-go- round or a horse near the inside rail?

33. Answer The one on the outside because it has a larger radius

34. Question Which has greater rotational speed, a horse near the outside rail of a merry-go- round or a horse near the inside rail?

35. Answer They both have the same rotational speed

36. Question According the Newton’s law of universal gravitation, what is the relationship between force and distance

37. Answer Inverse squared

38. Questions In what direction does centripetal force pull?

39. Answer Inward / toward the center of the circle

40. Question If centripetal force is taken away, what will happen to the object moving in the circle?

41. Answer The object will fly off tangent (in a straight line)

42. Question a.is always an attraction. b.depends on how massive they are. c.depends inversely on the square of the distances between them. d.all of the above The gravitational force between two massive spheres

43. Answer a.is always an attraction. b.depends on how massive they are. c.depends inversely on the square of the distances between them. d.all of the above The gravitational force between two massive spheres

44. Question Gravitational forces are the weakest forces found in nature. Because of this _____. a.the gravitational effect between a pencil and Earth cannot be seen b.there is no gravitational force between two 1- kg masses c.gravitational forces that are easily observed involve one or more large masses d.there is no movement between two large masses located near each other in space

45. Answer Gravitational forces are the weakest forces found in nature. Because of this _____. a.the gravitational effect between a pencil and Earth cannot be seen b.there is no gravitational force between two 1- kg masses c.gravitational forces that are easily observed involve one or more large masses d.there is no movement between two large masses located near each other in space