1. Physical Science Ch 2 & 3 Test Review

2. _______ is the rate of change in position. Motion

3. _______ is how far an object has moved. Distance

4. _______ is the distance from the starting point. Displacement

5. _______ is the distance an object travels per unit of time. Speed

6. _______ is any change over time. Rate

7. _______ is the equation for speed. Speed = distance time time

8. _______ is the speed at a given point in time Instantaneous speed

9. _______ is total distance traveled divided by total time. Average Speed

10. _______ describes both the speed and direction of an object. Velocity

11. The difference between velocity and speed is _______. Direction

12. _______ is the rate of change in velocity. Acceleration

13. _______ is negative acceleration. Deceleration

14. _______ is the equation for acceleration. Acceleration = Velocity Time Time

15. The Greek letter _______ (Δ) stands for _______. Delta change change

16. A _______ is a push or pull one body exerts on another. Force

17. _______ forces are equal in size, but opposite in direction. Balanced

18. _______ forces always cause a change in motion of an object. Unbalanced

19. _______ forces never cause a change in motion of an object. Balanced

20. _______ force is when two or more forces combine. Net

21. _______ is the reason why a table cloth can be quickly removed from a table without disturbing the place settings. Inertia

22. State Newton’s first law of motion. An object moving at constant velocity keeps moving at that velocity unless a net force acts on it.

23. _______ is the force that opposes motion between two touching surfaces. Friction

24. State Newton’s second law as an equation. F=ma

25. _______ is the value of acceleration due to gravity on the earth. 9.8 m/s 2

26. What is the equation for weight of an object on the earth? W = mg

27. _______ is the force air exerts on a moving object. Air Resistance

28. _______ is the area where two surface “bumps” stick together. Micro welds

29. State three types of friction. Static, Sliding, & Rolling

30. _______ friction occurs when an object is not moving. Static

31. _______ friction is the force opposing motion 2 touching surfaces where micro welds constantly break & reform. Sliding

32. _______ is the highest velocity that will be reached by a falling object. Terminal Velocity

33. Terminal velocity is when _______ is equal to _______. Acceleration due to gravity Airresistance

34. Explain why according to Newton’s 2 nd law of motion why players can’t hit or throw a softball as far as a baseball. Same force is applied thing with greater mass will have a slower acc., so softball bigger mass, will be moving slower than baseball.

35. _______ is the reason that a person can safely parachute from a high-flying plane. Air Resistance

36. Why is it that you do not feel the gravitational force between your hand and a pencil that you hold in your hand? In comparison, your hand is insignificant

37. _______ is the measure of the force of gravity on an object. Weight

38. Does gravity have any effect on the mass of a substance? NO

39. What are the four basic forces? GravityElectromagnetic Weak Nuclear Force Strong Nuclear Force

40. _______ is anything that is thrown or shot through the air. Projectile

41. _______ motion of a projectile is due to gravity. Vertical

42. _______ _______ is acceleration toward the center of a curved or circular path. Centripetal Acceleration

43. _______ _______ is a force acting toward the center of a curved or circular path. Centripetal Force

44. Explain why something in orbit of the earth seems to be weightless. All falling at same speed

45. If an object was in circular motion, what path would it travel if the motion stopped? Straight line

46. State Newton’s third law of motion. For every action there is an equal but opposite reaction

47. According to Newton’s third law of motion, forces come in _______. pairs

48. _______ is a property that a moving object has because of it’s mass and velocity. Momentum

49. _______ is the equation for momentum. p = m v

50. State the law of conservation of momentum. Momentum can neither be created nor destroyed it just changes forms

51. _______ states that momentum can neither be created nor destroyed it just changes forms. Law of Conservation of Momentum