Question 1

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

Accepted Answer

A) may be less than zero. 
B) is zero. 
C) may be more than zero. 
A) may be less than zero. 
B) is zero. 
C) may be more than zero.

Question 2

Your weight as measured on your bathroom scale is

Accepted Answer

A) equal to your mass. 
B) the force due to gravity on you. 
C) a property of mechanical equilibrium. 
D) all of the above 
A) equal to your mass. 
B) the force due to gravity on you. 
C) a property of mechanical equilibrium. 
D) all of the above

Question 3

The newton is a unit of

Accepted Answer

A) force. 
B) mass. 
C) density. 
D) inertia. 
A) force. 
B) mass. 
C) density. 
D) inertia.

Question 4

If an object's mass is decreasing while a constant force is applied to the object, the acceleration

Accepted Answer

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

Question 5

A 10-N falling object encounters 10 N of air resistance. The net force on the object is

Accepted Answer

A) 0 N. 
B) 4 N. 
C) 6 N. 
D) 10 N. 
E) none of these 
A) 0 N. 
B) 4 N. 
C) 6 N. 
D) 10 N. 
E) none of these

Question 6

An apple at rest weighs 1 N. The net force on the apple when it is in free fall is

Accepted Answer

A) 0 N. 
B) 0.1 N. 
C) 1 N. 
D) 9.8 N. 
E) none of the above 
A) 0 N. 
B) 0.1 N. 
C) 1 N. 
D) 9.8 N. 
E) none of the above

Question 7

A car by itself is capable of a certain maximum acceleration. When it tows a twice-as-massive car, its maximum acceleration is

Accepted Answer

A) one half. 
B) one third. 
C) one fourth. 
D) the same. 
E) none of these 
A) one half. 
B) one third. 
C) one fourth. 
D) the same. 
E) none of these

Question 8

A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to the ground first?

Accepted Answer

A) The light woman 
B) The heavy man 
C) Both should arrive at the same time. 
D) not enough information 
A) The light woman 
B) The heavy man 
C) Both should arrive at the same time. 
D) not enough information

Question 9

A block is dragged without acceleration in a straight-line path across a level surface by a force of 6 N. What is the force of friction between the block and the surface?

Accepted Answer

A) less than 6 N 
B) 6 N 
C) more than 6 N 
D) need more information 
A) less than 6 N 
B) 6 N 
C) more than 6 N 
D) need more information

Question 10

Two objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the

Accepted Answer

A) lighter object. 
B) heavier object. 
C) Both hit at the same time. 
D) not enough information 
A) lighter object. 
B) heavier object. 
C) Both hit at the same time. 
D) not enough information

Question 11

If you are driving at 20 m/s and slam on your brakes and skid at 0.5g to a full stop, the skidding time is about

Accepted Answer

A)  3 s. 
B)  4 s. 
C)  5 s. 
D)  6 s. 
E) greater than 6 s. 
A)  3 s. 
B)  4 s. 
C)  5 s. 
D)  6 s. 
E) greater than 6 s.

Question 12

A 1000-kg automobile enters a freeway on-ramp at 20 m/s and accelerates uniformly up to 40 m/s in a time of 10 seconds. How far does the automobile travel during that time?

Accepted Answer

A) 100 m 
B) 200 m 
C) 300 m 
D) 400 m 
E) none of the above 
A) 100 m 
B) 200 m 
C) 300 m 
D) 400 m 
E) none of the above

Question 13

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

Question 14

If less horizontal force is applied to a sliding object than is needed to maintain a constant velocity, the object

Accepted Answer

A) accelerates in the direction of the applied force. 
B) experiences decreased friction. 
C) eventually slides to a stop. 
D) none of the above 
A) accelerates in the direction of the applied force. 
B) experiences decreased friction. 
C) eventually slides to a stop. 
D) none of the above

Question 15

The mass of a pet turtle that weighs 10 N is about

Accepted Answer

A) 1 kg. 
B) 10 kg. 
C) 100 kg. 
D) 1000 kg. 
E) none of the above 
A) 1 kg. 
B) 10 kg. 
C) 100 kg. 
D) 1000 kg. 
E) none of the above

Question 16

A feather and a coin will have equal accelerations when falling in a vacuum because

Accepted Answer

A) their velocities are the same. 
B) the force of gravity is the same for each in a vacuum. 
C) the force of gravity does not act in a vacuum. 
D) the ratio of both the feather's and coin's weight to mass is the same. 
E) none of the above 
A) their velocities are the same. 
B) the force of gravity is the same for each in a vacuum. 
C) the force of gravity does not act in a vacuum. 
D) the ratio of both the feather's and coin's weight to mass is the same. 
E) none of the above

Question 17

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

Accepted Answer

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

Question 18

A force of 1 N accelerates 1-kg box at the rate of 1 m/s2. The acceleration of a 2-kg box by a net force of 2 N is

Accepted Answer

A) half as much. 
B) twice as much. 
C) the same. 
D) none of the above 
A) half as much. 
B) twice as much. 
C) the same. 
D) none of the above

Question 19

Which has the greater mass?

Accepted Answer

A) a king-size pillow 
B) an automobile battery 
C) both the same 
A) a king-size pillow 
B) an automobile battery 
C) both the same

Question 20

A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is then

Accepted Answer

A) 300 N downward. 
B) 500 N downward. 
C) 800 N downward. 
D) 300 N upward. 
E) 500 N upward. 
A) 300 N downward. 
B) 500 N downward. 
C) 800 N downward. 
D) 300 N upward. 
E) 500 N upward.

Exam 4: Newtons Second Law of Motion

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

Your weight as measured on your bathroom scale is

The newton is a unit of

If an object's mass is decreasing while a constant force is applied to the object, the acceleration

A 10-N falling object encounters 10 N of air resistance. The net force on the object is

An apple at rest weighs 1 N. The net force on the apple when it is in free fall is

A car by itself is capable of a certain maximum acceleration. When it tows a twice-as-massive car, its maximum acceleration is

A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to the ground first?

A block is dragged without acceleration in a straight-line path across a level surface by a force of 6 N. What is the force of friction between the block and the surface?

Two objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the

If you are driving at 20 m/s and slam on your brakes and skid at 0.5g to a full stop, the skidding time is about

A 1000-kg automobile enters a freeway on-ramp at 20 m/s and accelerates uniformly up to 40 m/s in a time of 10 seconds. How far does the automobile travel during that time?

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

If less horizontal force is applied to a sliding object than is needed to maintain a constant velocity, the object

The mass of a pet turtle that weighs 10 N is about

A feather and a coin will have equal accelerations when falling in a vacuum because

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

A force of 1 N accelerates 1-kg box at the rate of 1 m/s2. The acceleration of a 2-kg box by a net force of 2 N is

Which has the greater mass?

A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is then

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A force of 1 N accelerates 1-kg box at the rate of 1 m/s². The acceleration of a 2-kg box by a net force of 2 N is