Question 1

Whenever the net force on an object is zero, its acceleration

Accepted Answer

A)  may be zero.
B)  is zero.

Question 2

Starting from rest, the distance a freely falling object will fall in 10 s is about

Accepted Answer

A)  10 m.
B)  50 m.
C)  100 m.
D)  500 m.

Question 3

When you stand at rest on a pair of bathroom scales, the readings on the scales will always

Accepted Answer

A)  each be half your weight.
B)  each equal your weight.
C)  add to equal your weight.

Question 4

Where is friction most evident?

Accepted Answer

A)  on the road
B)  in a cup of coffee
C)  in the atmosphere
D)  everywhere

Question 5

The average speed of a horse that gallops a distance of 10 km in a time of 30 min is

Accepted Answer

A)  10 km/h.
B)  20 km/h.
C)  30 km/h.
D)  more than 30 km/h.

Question 6

An object in mechanical equilibrium is an object

Accepted Answer

A)  at rest.
B)  moving with constant velocity.
C)  having no acceleration.
D)  all of the above

Question 7

Suppose a jumper claims a hang time of 2 s. Then that jumper must be able to jump a height of

Accepted Answer

A)  1 m.
B)  2 m.
C)  3 m.
D)  4 m.
E)  5 m.

Question 8

Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much

Accepted Answer

A)  inertia.
B)  mass.
C)  volume.
D)  all of the above
E)  none of the above

Question 9

A ball is thrown upward and caught when it comes back down. In the presence of air resistance, the speed with which it is caught is

Accepted Answer

A)  more than the speed it had when thrown upward.
B)  less than the speed it had when thrown upward.
C)  the same as the speed it had when thrown upward.

Question 10

Consider drops of water that leak from a dripping faucet. As the drops fall, they

Accepted Answer

A)  get closer together.
B)  get farther apart.
C)  remain at a relatively fixed distance from one another.

Question 11

A pot falls from a ledge and hits the ground 45 m below. The speed with which it hits the ground is about

Accepted Answer

A)  30 m/s.
B)  60 m/s.
C)  120 m/s.
D)  more than 120 m/s.

Question 12

When can an object be in a state of equilibrium?

Accepted Answer

A)  when two or more forces are acting on it
B)  when it is at rest and no forces are acting on it
C)  only when one force is acting on the object
D)  when an object is not moving

Question 13

A ball is thrown 125 m upward and then falls the same distance back to the Earth. Neglecting air resistance, its total time in the air is about

Accepted Answer

A)  5 s.
B)  10 s.
C)  15 s.
D)  more than 20 s.

Question 14

Ten seconds after starting from rest, a freely falling object on Earth will have a speed of about

Accepted Answer

A)  10 m/s.
B)  50 m/s.
C)  100 m/s.
D)  more than 100 m/s.

Question 15

When a loaf of bread rises, its density

Accepted Answer

A)  increases.
B)  decreases.
C)  stays the same.

Question 16

A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is

Accepted Answer

A)  30 N.
B)  300 N.
C)  3000 N.
D)  more than 3000 N.

Question 17

The two measurements necessary for calculating average speed are

Accepted Answer

A)  acceleration and time.
B)  velocity and time.
C)  distance and time.
D)  distance and acceleration.
E)  velocity and distance.

Question 18

An object weighs 30 N on Earth. A second object weighs 30 N on the Moon. Which has the greater mass?

Accepted Answer

A)  the one on Earth
B)  the one on the Moon
C)  They have the same mass.
D)  not enough information given

Question 19

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

Accepted Answer

A)  more than 10 N.
B)  less than 10 N.
C)  10 N.

Question 20

If a nonrotating object has no acceleration, then we can say for certain that it is

Accepted Answer

A)  at rest.
B)  moving at constant nonzero velocity.
C)  in mechanical equilibrium.
D)  all of the above
E)  none of the above

Exam 2: Describing Motion

Starting from rest, the distance a freely falling object will fall in 10 s is about

Correct AnswerverifiedShow Answer

Consider drops of water that leak from a dripping faucet. As the drops fall, they

Correct AnswerverifiedShow Answer

Suppose a jumper claims a hang time of 2 s. Then that jumper must be able to jump a height of

Correct AnswerverifiedShow Answer

An object in mechanical equilibrium is an object

Correct AnswerverifiedShow Answer

If a nonrotating object has no acceleration, then we can say for certain that it is

Correct AnswerverifiedShow Answer

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

Correct AnswerverifiedShow Answer

Whenever the net force on an object is zero, its acceleration

Correct AnswerverifiedShow Answer

When a loaf of bread rises, its density

Correct AnswerverifiedShow Answer

When you stand at rest on a pair of bathroom scales, the readings on the scales will always

Correct AnswerverifiedShow Answer

When can an object be in a state of equilibrium?

Correct AnswerverifiedShow Answer

Ten seconds after starting from rest, a freely falling object on Earth will have a speed of about

Correct AnswerverifiedShow Answer

An object weighs 30 N on Earth. A second object weighs 30 N on the Moon. Which has the greater mass?

Correct AnswerverifiedShow Answer

A ball is thrown upward and caught when it comes back down. In the presence of air resistance, the speed with which it is caught is

Correct AnswerverifiedShow Answer

A ball is thrown 125 m upward and then falls the same distance back to the Earth. Neglecting air resistance, its total time in the air is about

Correct AnswerverifiedShow Answer

Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much

Correct AnswerverifiedShow Answer

The two measurements necessary for calculating average speed are

Correct AnswerverifiedShow Answer

The average speed of a horse that gallops a distance of 10 km in a time of 30 min is

Correct AnswerverifiedShow Answer

A pot falls from a ledge and hits the ground 45 m below. The speed with which it hits the ground is about

Correct AnswerverifiedShow Answer

A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is

Correct AnswerverifiedShow Answer

Where is friction most evident?

Correct AnswerverifiedShow Answer

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