Exam 1

Question 1

Which of the following is a vector quantity?
A. time B. acceleration C. mass D. speed

Answer 1

B. acceleration

Question 2

If an object is accelerating upward,
A. the net force on it must be upward.
B. the net force on it must be downward.
C. its velocity must be upward.
D. its velocity must be downward.

Answer 2

A. the net force on it must be upward.

Question 3

A car moving along the x-axis is traveling in the negative direction. If it speeds up, its acceleration is
A. positive. B. zero. C. negative. D. undetermined.

Answer 3

C. negative.

Question 4

The net force on the car in the previous question is
A. in the −y direction.
B. zero.
C. in the direction opposite to its acceleration.
D. in the same direction as its acceleration.

Answer 4

D. in the same direction as its acceleration.

Question 5

For an object near Earth’s surface, its weight is always
A. equal to its mass.
B. a scalar.
C. equal and opposite to the normal force.
D. vertically downward.

Answer 5

D. vertically downward.

Question 6

Which of the following is a vector quantity?
A. distance B. speed C. time D. force

Answer 6

D. force

Question 7

If an object moves in one dimension with a constant, positive velocity,
A. its acceleration is zero.
B. its acceleration is positive.
C. its acceleration is negative.
D. it must be speeding up.

Answer 7

A. its acceleration is zero.

Question 8

If an object is accelerating to the left,
A. its velocity must be to the left.
B. the net force on it must be to the left.
C. its velocity must be to the right.
D. the net force on it must be to the right.

Answer 8

B. the net force on it must be to the left.

Question 9

A car moving along the x-axis is traveling in the positive direction. If it slows down, its
acceleration is
A. positive. B. zero. C. negative. D. undetermined.

Answer 9

C. negative.

Question 10

The net force on the car in the previous question is
A. in the same direction as its acceleration.
B. in the direction opposite to its acceleration.
C. zero.
D. in the −y direction.

Answer 10

A. in the same direction as its acceleration.

Question 11

Which of the following is a scalar quantity?
A. acceleration B. time C. velocity D. force

Answer 11

B. time

Question 12

An object that is accelerating could have
A. a changing speed.
B. a changing velocity.
C. a changing direction.
D. Any of the above

Answer 12

D. Any of the above

Question 13

If the net force on an object is to the right,
A. its acceleration must be to the right. B. its velocity must be to the right.
C. its acceleration must be to the left. D. its velocity must be to the left.

Answer 13

A. its acceleration must be to the right.

Question 14

An elevator is moving upward. If it slows down as it approaches the top floor, its acceleration is
A. upward. B. zero. C. downward. D. undetermined.

Answer 14

C. downward.

Question 15

The net force on the elevator in the previous question is
A. in an undetermined direction.
B. zero.
C. in the direction opposite to its acceleration.
D. in the same direction as its acceleration.

Answer 15

D. in the same direction as its acceleration.

Question 16

An object that is accelerating must have
A. a nonzero instantaneous velocity. B. a changing velocity.
C. an instantaneous velocity of zero. D. a constant velocity.

Answer 16

B. a changing velocity.

Question 17

If the net force on an object is downward,
A. its acceleration must be upward.
B. its acceleration must be downward.
C. its velocity must be upward.
D. its velocity must be downward.

Answer 17

B. its acceleration must be downward.

Question 18

An elevator is moving downward. If it slows down as it approaches the first floor, its acceleration is
A. upward. B. zero. C. downward. D. undetermined.

Answer 18

A. upward.

Question 19

The net force on the elevator in the previous question is
A. in the same direction as its acceleration.
B. in the direction opposite to its acceleration.
C. zero.
D. in an undetermined direction.

Answer 19

A. in the same direction as its acceleration.

Question 20

For an object near Earth’s surface, its weight
A. is vertically downward.
B. is equal and opposite to the normal force.
C. is only there if the object is touching Earth.
D. is equal to its mass.

Answer 20

A. is vertically downward.

Question 21

If an object moves in one direction with a constant, negative, velocity,
A. It must be slowing down.
B. Its acceleration must be zero.
C. Its acceleration is postive.
D. Its acceleration is negative.

Answer 21

B. Its acceleration must be zero.