NEWTON’S LAWS TEST REVIEW

A motorcycle traveling 35 mi/hr slows as it approaches a stop sign. This is an example of —

a) acceleration b) distance c) speed d) velocity

1

A released balloon flies across the room. The balloon slows down as the forces become —

a) balanced b) frictional c) restricted d) unbalanced

2

A bike racer travels 17 mi/hr in a southerly direction. This is an example of —

a) distance b) speed c) velocity d) acceleration

3

4

The net force of balanced force pairs is ____.

a. positive.b. negative.c. either positive or negative.d. zero

Between which two locations would the greatest change in speed most likely occur?

a) Between S and T b) Between T and U c) Between U and X d) Between T and X

6

What force is necessary to accelerate a 1,250 kg car at a rate of 40 m/s2?

a. 31.25 Nb. 40.0 Nc. 1,250 Nd. 50,000 N

Based on the observations, the runners do not accelerate during — a) Segment A b) Segments A and C c) Segments B and C d) Segments C and D

Segment During a race, runners . . .

A. . . wait at the starting line for the starter’s signal.

B. . . speed up on the straight section of the track.

C. . . change direction as they round the corner of the track.

D. . . slow down after they cross the finish line.

What is the net force acting on the object?

Are the forces balanced or unbalanced?

8

30 Nleft

50 Nright

20 N right

unbalanced

How does Newton’s first law of motion apply to a ball rolling across the gym floor after an unbalanced force is applied?

a) The ball will stop at the line halfway across the gym.

b) The ball will continue to roll until an unbalanced force is applied.

c) The ball will start bouncing until it hits the wall. d) The ball will roll in a zigzag pattern to the other

end of the gym.

9

The law requires all people riding in a car to wear seat belts. If the car suddenly stops, the seat belts hold the passengers in place. How does Newton’s fi rst law of motion apply when a person is not wearing a seat belt?

a) A The passengers will continue moving forward due to inertia.

b) B The passengers will move backward into the seat.

c) C The passengers will lean into another passenger’s seat.

d) D The passengers will not be affected by the sudden stop of the car.

10

When the air is released from a balloon, the air moves out one end and the balloon moves in the other direction. Which statement does this situation best illustrate?

A What goes up must come down. B For every action there is an equal and opposite reaction. C The shape and size of an object aff ect air resistance. D The acceleration due to Earth’s gravity is 9.8 m/s2.

11

Which of these statements best describes the action-reaction force needed to launch a space shuttle?

a) The ground pushes up on the rocket when exhaust gases push down on the ground.

b) Exhaust gases push down on air, while the ground pushes up on the rocket.

c) The rocket pushes exhaust gases down, while the exhaust gases push the rocket up.

d) Gravity pulls the rocket exhaust down, while friction pushes up against the atmosphere.

12

If a force of 50 N is applied to each of the three objects, which one will have the least acceleration?

a) Object X, because it has the greatest mass b) Object Y, because it has the least volume c) Object Z, because it has the least mass d) Object Z, because it has the greatest volume

OBJECT MASS (g) VOLUME (cm3)

X 38 32

Y 36 19

Z 21 35

How much force is needed to accelerate a 3 kg toy car at a rate of 1.5 m/s2?

F = M x AF = 3kg x 1.5m/s2

F= 4.5 N