- Semester Review Questions

ESSENTIAL IDEA

**The type of motion demonstrated by an object depends on the net force exerted upon the object.**

**Position and time data was collected in a physics class by students using a motion detector.**

**The graphs below represent five of the data sets collected by the students.**

**Use the graphs below for questions 1-5.**

AC E

BD

1. Which graph describes an object that is not moving?

a) Ab) Bc) Cd) De) E

2. Which graph describes an object with the greatest uniform speed?

a) Ab) Bc) Cd) De) E

3. Which graph describes an object moving with the greatest uniform acceleration?

a) Ab) Bc) Cd) De) E

4. Which graphs describe objects moving (not stationary) with uniform speed?

a) Ab) Bc) Cd) De) E

5. Which graphs describe objects moving with uniform acceleration?

a) Ab) Bc) Cd) De) E

ESSENTIAL IDEA**The type of motion demonstrated by an object depends on the net force exerted upon the object.**

**Position and time data for a moving car was collected by physics students using a motion detector.**

**The graph below represents one of the data sets collected by the students.**

**Use the graph below for question 6-7.**

6. Which description of the observed motion is most accurate?

The car is...

a) standing still for the first 10 seconds and then moves with a uniform speed.

b) accelerating away for the first 10 seconds and then it moves with a uniform speed.

c) standing still for the first 10 seconds and then it moves with uniform acceleration.

d) moving with a uniform speed for the first 10 seconds and then it moves with uniform acceleration.

e) moving with a uniform speed for the first 10 seconds and then it stands still.

7. During which of the following times is the car moving the fastest?

a) 2-6 secondsb) 6-10 secondsc) 10-14 secondsd) 16-20 seconds

**The bird shown above accelerates from rest, crosses the street at a uniform speed and then slows down.**

8. Which graph matches this described motion?

ABC

a) Ab) Bc) C

ESSENTIAL IDEA**The type of motion demonstrated by an object depends on the net force exerted upon the object.**

**A physics student pulls a ticker tape through a ticker tape machine.**

**Use this set up for questions 9-10.**

9. Which ticker tape dot set(s) could be produced when the tape is pulled to the right with a uniform speed?

(you may select more than one)

a)c)e)

b)d)

10. Which ticker tape dot set(s) could be produced when the tape is pulled to the right with a uniform acceleration?

(you may select more than one)

a)c)e)

b)d)

11. Select the ticker tape dot set produced by an object moving with the greatest uniform speed.

a)c)e)

b)d)

12. Select the ticker tape dot set produced by an object that accelerates and then slows down.

a)c)e)

b)d)

ESSENTIAL IDEA**The type of motion demonstrated by an object depends on the net force exerted upon the object.**

**The tickertape machine is turned on and the tape is released. **

**Assume that there is no friction in the system.**

**Use this example for questions 13-15**

13. Which of the following ticker tape dot sets would be produced by the falling weight?

a)b)c)d)

14. Which of the following position vs. time graphs would best describe the motion of the falling weight?

a) b) c) d)

15. What kind of motion will the falling weight have?

a) no motion

b) uniform speed

c) uniform acceleration

d) both uniform speed and uniform acceleration

**A toy wind up truck pulls the ticker tape at a constant speed for a while and then slows to a stop.**

The pattern of dots shown above was found on a ticker tape.

16. Select the graph that best matches this pattern.

a) b) c) d)

ESSENTIAL IDEAThe type of motion demonstrated by an object depends on the net force exerted upon the object.

17. A snail moves 30.cm in 15. seconds. What is the average speed of the snail?

a) 450 cm/sb) 2 cm/sc) 0.5 cm/sd) 45 cm/s

Position and Time data was collected by physics students. That data is shown on the graphs below.

Use these graphs for questions 18-21.

Object A.Object B.

18. Determine the average speed of object A for the entire 20 seconds.

a) 40 m/sb) 0.1 m/sc) 10 m/sd) 1m/s

19. Determine the average speed of object B for the entire 20 seconds.

a) 40 m/sb) 0.1 m/sc) 10 m/sd) 1m/s

20. Compare the speed of object A to object B between 18-20 seconds.

a) A is moving faster than B between 18-20 seconds.

b) B is moving faster than A between 18-20 seconds.

c) A and B are moving at the same speed between 18-20 seconds.

21. Select the explanation that best supports the correct answer to #20.

a) Object A is moving at a uniform speed.

b) Object A is accelerating.

c) Object B is moving at a uniform speed.

d) Object B is accelerating.

I.II.

22. Which ticker tape trace is collected from an object with the highest average speed?

a) I

b) II

c) both object I and object II have the same speed.

ESSENTIAL IDEAThe type of motion demonstrated by an object depends on the net force exerted upon the object.

23. What is the average speed of runner A at 40 meters?

a) 5.7 m/sb) 400 m/sc) 280 m/sd) 4 m/s

24. What is the average speed of runner B at 40 meters?

a) 5.7 m/sb) 400 m/sc) 280 m/sd) 4 m/s

25. Which runner won the race?

a) Runner Ab) Runner Bc) Runners A and B tied.

A baseball player accelerates away from first base.

26. Select the statement that best describes the forces exerted on the baseball player.

a) The forces exerted on the baseball player are balanced.

b) There is no net force exerted on the baseball player.

c) Gravity causes the baseball player to accelerate.

d) There is a net force exerted on the baseball player.

A marble moves across a table at a constant velocity.

27. Select the statement that best describes the forces exerted on the marble while it moves at a constant velocity.

a) A net force pushes the marble.

b) Gravity pushes the marble.

c) No net force is exerted on the marble.

d) The marble experiences unbalanced forces.

ESSENTIAL IDEAThe type of motion demonstrated by an object depends on the net force exerted upon the object.

An air hockey puck moving in a straight line at 1m/s hits the side of a table. After the hit, the puck moves away from the side of the table at 1m/s in a different direction.

28. Select the statement that best describes the forces exerted on the puck.

a) A net force is exerted on the puck at A.

b) A net force is exerted on the puck at B.

c) A net force is exerted on the puck at C.

d) No net force is exerted on the puck at A, B or C.

Position and time data was collected in a physics class by students using a motion detector.

The graphs below represent three of the data sets collected by the students.

Use the graphs below for questions 29-32.

Object A. Object B. Object C.

29. When is a net force is exerted on the object described by graph A?

a) 0-3 secondsb) 6-9 secondsc) 9-12 secondsd) nevere) both a and b

30. When is a net force is exerted on the object described by graph B?

a) 0-9 secondsb) only 6-9 secondsc) 9-12 secondsd) nevere) both a and c

31. When is a net force is exerted on the object described by graph C?

a) 0-3 secondsb) 6-9 secondsc) 9-12 secondsd) nevere) both a and c

32. Select all of the ticker tape traces where a net force is exerted on the object.

(you may select more than one answer)

a)c)e)

b)d)

ESSENTIAL IDEAThe type of motion demonstrated by an object depends on the net force exerted upon the object.

You push a salt shaker so that it slides across the table and comes to a stop.

Use this example for questions 33-35.

33. Which of the following diagrams best represents the forces exerted on the salt shaker in A?

a) c) e)

b) d)

34. Which of the following diagrams best represents the forces exerted on the salt shaker in B?

a) c) e)

b) d)

35. Which of the following diagrams best represents the forces exerted on the salt shaker in C?

a) c) e)

b) d)

ESSENTIAL IDEAThe type of motion demonstrated by an object depends on the net force exerted upon the object.

36. What is the net force exerted on the helicopter?

a) 13,000 Newtonsc) 1,500 Newtons

b) 26,000 Newtonsd) 500 Newtons

37. What will happen to the 2kg block?

a) The block will accelerate at 5 m/s2.c) The block will accelerate at 3 m/s2.

b) The block will accelerate at 6 m/s2.d) The block will not accelerate.

38. What will happen to the 2kg block?

a) The block will accelerate at 5 m/s2.c) The block will accelerate at 3 m/s2.

b) The block will accelerate at 1 m/s2.d) The block will not accelerate.

ESSENTIAL IDEAWhen objects interact, like forces are exchanged and momentum is transferred.

In the following figure, student A has a mass of 75 kg, and student B has a mass of 50 kg.

They sit in identical office chairs facing each other.

Student A places his hands on the hands of student B, as shown.

Student A then suddenly pushes outward with his hands, causing both chairs to move.

39. During the push and while the students are still touching one another, .

a) neither student exerts a force on the other.

b) student A exerts a force on student B, but B does not exert any force on A. .

c) each student exerts a force on the other, but B exerts the larger force. .

d) each student exerts a force on the other, but A exerts the larger force. .

e) each student exerts the same amount of force on the other. .

ESSENTIAL IDEAWhen objects interact, like forces are exchanged and momentum is transferred.

The students drawn above are holding bathroom scales.

They push against one another as the picture shows.

40. If the scale on the left reads 40.N, the scale on the right will read...

a) Greater than 40. newtons.

b) Less than 40. newtons.

c) 40. newtons.

d) It depends on whether or not the people move.

A large truck collides with a small car as shown above.

41. The force exerted by the truck will be...

a) zero.

b) greater than the force exerted by the car on the truck.

c) smaller than the force exerted by the car on the truck.

d) the same size as the force exerted by the car on the truck.

A pair of blocks are push along a frictionless surface as shown below.

Use this example for questions 42-44.

42. What is the size and direction of the force exerted by the hand (total force on both blocks)?

a) 6 newtons to the rightc) 15 newtons to the righte) 9 newtons to the right

b) 6 newtons to the leftd) 15 newtons to the left

43. What is the size and direction of the force exerted by block A on block B (just the force on block B)?

a) 6 newtons to the rightc) 15 newtons to the righte) 9 newtons to the right

b) 6 newtons to the leftd) 15 newtons to the left

44. What is the direction and magnitude of the force exerted by block B on Block A?

a) 6 newtons to the rightc) 15 newtons to the righte) 9 newtons to the right

b) 6 newtons to the leftd) 15 newtons to the left

ESSENTIAL IDEAWhen objects interact, like forces are exchanged and momentum is transferred.

Block A slides along a frictionless surface at 1m/s.

Block B is stationary.

The two blocks will collide.

Use this example for questions 45-49.

45. During the collision, what will be the direction of the net force on block B?

a) b) c) no net force will be exerted on block B

46. During the collision, what will be the direction of the net force on block A?

a) b) c) no net force will be exerted on block A

47. During the collision, the force exerted by block A on block B is...

a) greater than the force exerted by block B on A.

b) less than the force exerted by block B and A.

c) the same as the force exerted by block B on A.

48. During the collision, the acceleration experienced by block A is...

a) greater than the acceleration experienced by block B.

b) less than the acceleration experienced by block B.

c) the same as the acceleration experienced by block B.

49. Predict the velocity of block B after the collision.

a) greater than 1 m/s to the rightb) less than 1m/s to the rightc) 1m/s to the right

Block A slides along a frictionless surface at 1m/s.

Block B is stationary.

The two blocks will collide elastically.

Use this example for questions 50-51.

50. Predict the velocity of block A after the collision.

a) greater than 1 m/s to the rightb) less than 1m/s to the rightc) 1m/s to the right

51. Predict the velocity of block A after the collision.

a) greater than 1 m/s to the rightb) less than 1m/s to the rightc) 1m/s to the right

ESSENTIAL IDEAWhen objects interact, like forces are exchanged and momentum is transferred.

Block A slides along a frictionless surface at 1m/s.

Block B is stationary.

The two blocks will collide elastically.

Use this example for questions 52-53.

52. Predict the velocity of block A after the collision.

a) greater than 1 m/s to the rightb) less than 1m/s to the rightc) 1m/s to the right

53. Predict the velocity of block A after the collision.

a) greater than 1 m/s to the rightb) less than 1m/s to the rightc) 1m/s to the right

A soccer ball with a mass of 0.45kg is traveling at 10 m/s.

54. What is the momentum of the soccer ball?

a) 45 kg•m/s b) 4.5 kg•m/sc) 0.45 kg•m/sd) 450 kg•m/s

55. What was the change in momentum experienced by the ball?

a) 1 kg•m/s b) 2 kg•m/sc) 3 kg•m/sd) 1/2 kg•m/s

A force of 3N is exerted on a block for 3 seconds.

The surface is frictionless.

56. What is the change in momentum experienced by the block?

a) 3 kg•m/s b) 9 kg•m/sc) 6 kg•m/sd) 1 kg•m/s

ESSENTIAL IDEAWhen objects interact, like forces are exchanged and momentum is transferred.

57. Where will the ball experience the greatest change in momentum?

a) Ab) Bc) Cd)D

The graph above represents the net force exerted on a box.

58. What is the change in momentum experienced by the box after 12 seconds?

a) 18 kg•m/s b) 6 kg•m/sc) 24 kg•m/sd) 72 kg•m/s

A pumpkin dropped onto the floor from the top of the ladder will break.

A pumpkin dropped into a box of styrofoam peanuts from the ladder will not break.

59. Select the response that best explains why the pumpkin won’t break when dropped into the deep box of styrofoam peanuts?

a) The peanuts exert a smaller stopping force over a long time, while the floor exerts a big stopping force over a short time.

b) The peanuts exert a larger stopping force over a short time, while the floor exerts a small stopping force over a long time.

c) The peanuts take force away from the pumpkin.

d) The peanuts make the pumpkin bounce.

ESSENTIAL IDEAWhen objects interact, like forces are exchanged and momentum is transferred.

The picture below shows identical drivers in two different cars.

Car A and Car B are moving at the same speed before a collision.

During the collision, each driver is brought to rest (v=0m/s).

Car A does not have an airbag.Car B has an airbag.

60. Before the collision, which driver had a greater momentum?

a) The driver in car Ab) The driver in car Bc) Both drivers had the same momentum

61. Which driver experienced a greater change in momentum?

a) The driver in car Ab) The driver in car Bc) Both drivers had the same change in momentum

62. Which driver takes more time to slow to a stop?

a) The driver in car Ab) The driver in car Bc) Both drivers take the same time to stop

63. Which driver experiences a greater average force during the collision?

a) The driver in car Ab) The driver in car Bc) Both drivers experience the same force

64. What is the cause of injury in a collision?

a) the change in momentumb) the amount of net forcec) the mass of the driver

ESSENTIAL IDEAEnergy can be transferred between objects or systems or transformed from one kind into another.

A ball is released from A and allowed to roll along the smooth surface through C.

Use this diagram for questions 65-66

65. Which of the graphs below best describes the amount of gravitational potential energy and kinetic energy of the ball?

a) ABC

b) ABC

c) ABC

d) ABC

66. Which of the following correctly describes the order of energy transfer in this situation?

a) KEGPEKE

b) GPEKEGPE

c) GPEGPEGPE

d) KEKEKE

ESSENTIAL IDEAThe principle of conservation of energy can be used to predict characteristics of systems.

67. What is the gravitational potential energy of the ball?

a) 20. jb) 50jc) 1.0jd) 10j

ESSENTIAL IDEAThe principle of conservation of energy can be used to predict characteristics of systems.

68. What is the kinetic energy of the cart?

a) 10.jb) 2.5jc) 1.0jd)100j

A pendulum bob is released from rest at A and reaches its maximum speed at B.

Friction is not present in this system.

mass m=0.2 kgheight h = 0.3 mgravitational acceleration = 10. m/s2

69. What is the kinetic energy of the pendulum bob at B?

a) 0.5jb) 0.6jc) 0.06jd) 60j

A ball rolls along a flat surface and then rolls up a hill.

The ball stops for a moment at B before rolling back downhill.

Friction is not present in this system.

mass =0.25 kgspeed = 2.00 m/s

70. What is the total energy of the system at B?

a) 0.5jb) 1.0jc) 0.25jd) 0.75j

ESSENTIAL IDEAThe principle of conservation of energy can be used to predict characteristics of systems.

A pendulum bob is released from rest at A and reaches its maximum speed at B.

Friction is not present in this system.

Use this diagram for questions 71-72.

71. How does the gravitational potential energy of the bob at A compare to the kinetic energy of the bob at B?

a) GPE A is greater than KE Bb) GPE A is less than KE Bc) GPE A = KE B

72. The total change in energy in this system during the motion from A to B =

a) mg∆hb) 1/2mv2c) 0

A pendulum bob is released from rest at A and reaches its maximum speed at B.

Friction is not present in this system.

mass m=0.2 kgheight h = 0.3 mgravitational acceleration = 10. m/s2

73. What is the kinetic energy of the pendulum bob at B?

a) 0.5jb) 0.6jc) 0.06jd) 60j

A ball rolls along a flat surface and then rolls up a hill.

The ball stops for a moment at B before rolling back downhill.

Friction is not present in this system.

mass =0.25 kgspeed = 2.00 m/s

74. What is the gravitational potential energy of the ball at B?

a) 0.5jb) 1.0jc) 0.25jd) 0.75j

ESSENTIAL IDEAThere is a universal tendency for potential energy to be distributed in less concentrated states over time.

A ball is released from A at a height H.

The ball rolls down the hill and across a rough surface.