Motion and Forces Review

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Motion and Forces MCAS Review

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1. A race car travels at an average speed of 80 m/s in a race. The total distance of the race is 640,000 m. How long does it take the race car to finish the race?

800 s

8,000 s

6,400,000 s

51,200,000 s

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2. The table below shows the time it takes four cars to go from 0 to 60 km/hr.

Based on the information given, which of the following quantities can be compared for the four cars?

average acceleration

instantaneous speed

stopping distance

stopping time

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3. Which of the following will always change when an object accelerates?

mass

potential energy

velocity

weight

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4. A toy cart that has a weight of 10 N moves with a constant velocity of 2 m/s to the right on a horizontal table. According to Newton’s laws of motion, which of the following statements is correct?

The table exerts a force of 10 N upward on the toy cart.

The toy cart exerts a force of 10 N upward on the table.

The toy cart exerts a force of 2 N downward on the table.

The table exerts a force of 2 N to the right on the toy cart.

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5. Two students are standing next to each other on a level field. One of the students throws a table tennis ball forward toward a line 2.0 m away. At the same time, the second student throws a bowling ball in the same direction. Both balls take the same time to travel the 2.0 m. Only the second student feels a noticeable backward push when she throws her ball. Which of the following statements explains why only the second student feels a noticeable backward push?

The bowling ball exerts a much larger reaction force.

The bowling ball undergoes a much larger acceleration.

The bowling ball requires more force to overcome gravity.

The bowling ball converts more inertia into kinetic energy

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6. A 1500 kg car increases its speed by 2 m/s for each second of travel. What is the net force acting on the car?

a. 750 N

b. 1500 N

c. 3000 N

d. 6000 N

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7. Two students are in-line skating. The diagram below shows student S pushing student T. Student S has a mass of 60 kg, and student T has a mass of 40 kg. Student S is pushing student T in a straight line with a force equal to the friction on student T’s skates. Which of the following must happen if student S continues to push student T with the same force?

Student T will lose his balance.

Student T will travel in a circle.

Student T will move at a constant velocity.

Student T will move at a constant acceleration.

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8. A student is driving her car when an insect strikes her windshield. Which of the following statements best describes the forces in this situation?

The insect strikes the windshield with the same force as the windshield strikes the insect.

The insect strikes the windshield with a force, and the windshield exerts no force on the insect.

The insect exerts no force on the windshield, and the windshield strikes the insect with a large force.

The insect strikes the windshield with a small force, and the windshield strikes the insect with a large force.

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9. The graph below shows the distance an object traveled over time.

Which line segment represents the time interval during which the object was moving at a positive constant speed?

segment W

segment X

segment Y

segment Z

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10. The graph below shows the speed of an object during a 10 s time interval.

In which of the following time intervals is the speed of the object decreasing?

between 0 s and 2 s

between 2 s and 4 s

between 6 s and 8 s

between 8 s and 10 s

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11. A student leaving school walks 2.5 km north and then walks 1.0 km south. What is the student’s displacement?

1.0 km south

1.5 km north

2.5 km north

3.5 km south

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12. Which of the following statements identifies the main difference between vector and scalar quantities?

Only vectors have direction.

Only scalars have magnitude.

Only scalars have units associated with them.

Only vectors have units associated with them.

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13. A person with a weight of 120 lb. is standing on a scale. What force is the scale exerting on the person?

0 lb. up

60 lb. up

120 lb. up

240 lb. up

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14. Four students push on a block of wood with the forces shown in the diagram below. Assume friction is negligible.

The block slides horizontally. What is the net force acting on the block of wood?

3 N to the left

8 N to the left

11 N to the right

25 N to the right

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