Question 1

When a constant and sustained upward force acts on a rocket, its acceleration increases mainly because

Accepted Answer

A) gravity becomes weaker with increased distance. 
B) the mass of the rocket decreases as fuel is burned. 
C) No way, for acceleration would be constant. 
A) gravity becomes weaker with increased distance. 
B) the mass of the rocket decreases as fuel is burned. 
C) No way, for acceleration would be constant.

Question 2

A ball thrown straight upward takes 10 seconds for its up-and-down round trip. Because of air resistance, the time taken for the ball just to go up is

Accepted Answer

A) less than 5 s. 
B) 5 s. 
C) more than 5 s. 
A) less than 5 s. 
B) 5 s. 
C) more than 5 s.

Question 3

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

Question 4

The mass of a lamb that weights 110 N is about

Accepted Answer

A) 1 kg. 
B) 11 kg. 
C) 110 kg. 
D) 1100 kg. 
E) none of the above 
A) 1 kg. 
B) 11 kg. 
C) 110 kg. 
D) 1100 kg. 
E) none of the above

Question 5

Nellie pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration?

Accepted Answer

A) 0.3 m/s2 
B) 3.0 m/s2 
C) 10 m/s2 
D) 30 m/s2 
E) 300 m/s2 
A) 0.3 m/s2 
B) 3.0 m/s2 
C) 10 m/s2 
D) 30 m/s2 
E) 300 m/s2

Question 6

The force required to maintain a constant velocity for an astronaut in free space is equal to

Accepted Answer

A) zero. 
B) the mass of the astronaut. 
C) the weight of the astronaut. 
D) the force required to stop the astronaut. 
E) none of the above 
A) zero. 
B) the mass of the astronaut. 
C) the weight of the astronaut. 
D) the force required to stop the astronaut. 
E) none of the above

Question 7

A mobile phone is pulled northward by a force of 10 N and at the same time pulled southward by another force of 15 N. The resultant force on the phone is

Accepted Answer

A) 0 N. 
B) 5 N. 
C) 25 N. 
D) 150 N. 
A) 0 N. 
B) 5 N. 
C) 25 N. 
D) 150 N.

Question 8

A rock is thrown vertically into the air. At the top of its path, its acceleration is

Accepted Answer

A) zero. 
B) 10 m/s2. 
C) between 0 and 10 m/s2. 
D) greater than 10 m/s2. 
A) zero. 
B) 10 m/s2. 
C) between 0 and 10 m/s2. 
D) greater than 10 m/s2.

Question 9

A kilogram is a measure of an object's

Accepted Answer

A) force. 
B) mass. 
C) both of these 
D) neither of these 
A) force. 
B) mass. 
C) both of these 
D) neither of these

Question 10

A bag of groceries that has a mass of 10 kilograms weighs about

Accepted Answer

A) 1 N. 
B) 10 N. 
C) 100 N. 
D) 1000 N. 
E) greater than 1000 N. 
A) 1 N. 
B) 10 N. 
C) 100 N. 
D) 1000 N. 
E) greater than 1000 N.

Question 11

A 1-kg rock that weighs 10 N is thrown straight upward at 20 m/s. Neglecting air resistance, the net force that acts on it when it is half way to the top of its path is

Accepted Answer

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

Question 12

Suzie Skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on Suzie is then

Accepted Answer

A) 90 N. 
B) 250 N. 
C) 410 N. 
D) 500 N. 
E) none of the above 
A) 90 N. 
B) 250 N. 
C) 410 N. 
D) 500 N. 
E) none of the above

Question 13

A rock is thrown vertically into the air. At the top of its path the net force on it is

Accepted Answer

A) less than mg. 
B) mg. 
C) more than mg. 
A) less than mg. 
B) mg. 
C) more than mg.

Question 14

A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds. The speed of the car just before the brakes were applied was

Accepted Answer

A) 1.2 m/s. 
B) 15 m/s. 
C) 30 m/s. 
D) 45 m/s. 
E) none of the above 
A) 1.2 m/s. 
B) 15 m/s. 
C) 30 m/s. 
D) 45 m/s. 
E) none of the above

Question 15

A car by itself is capable of a certain maximum acceleration. When it tows a car of the same mass, 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 16

In which case would you have the largest mass of gold? If your chunk of gold weighed 1 N on the

Accepted Answer

A) Moon. 
B) Earth. 
C) planet Jupiter. 
A) Moon. 
B) Earth. 
C) planet Jupiter.

Question 17

Scotty Skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about

Accepted Answer

A) 0.2 g. 
B) 0.3 g. 
C) 0.4 g. 
D) 0.5 g. 
E) greater than 0.5 g. 
A) 0.2 g. 
B) 0.3 g. 
C) 0.4 g. 
D) 0.5 g. 
E) greater than 0.5 g.

Question 18

Two factors that greatly affect air resistance on falling objects are frontal area and

Accepted Answer

A) mass. 
B) weight. 
C) speed. 
A) mass. 
B) weight. 
C) speed.

Question 19

Phil stands at rest with both feet on a scale that reads 500 N. When he gently lifts one foot, the scale reads

Accepted Answer

A) less than 500 N. 
B) 500 N. 
C) more than 500 N. 
A) less than 500 N. 
B) 500 N. 
C) more than 500 N.

Question 20

At equilibrium on a bathroom weighting scale, the downward pull of gravity on you is balanced by

Accepted Answer

A) your weight. 
B) an upward support force. 
C) your mass. 
A) your weight. 
B) an upward support force. 
C) your mass.

Exam 4: Newtons Second Law of Motion

When a constant and sustained upward force acts on a rocket, its acceleration increases mainly because

A ball thrown straight upward takes 10 seconds for its up-and-down round trip. Because of air resistance, the time taken for the ball just to go up is

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

The mass of a lamb that weights 110 N is about

Nellie pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration?

The force required to maintain a constant velocity for an astronaut in free space is equal to

A mobile phone is pulled northward by a force of 10 N and at the same time pulled southward by another force of 15 N. The resultant force on the phone is

A rock is thrown vertically into the air. At the top of its path, its acceleration is

A kilogram is a measure of an object's

A bag of groceries that has a mass of 10 kilograms weighs about

A 1-kg rock that weighs 10 N is thrown straight upward at 20 m/s. Neglecting air resistance, the net force that acts on it when it is half way to the top of its path is

Suzie Skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on Suzie is then

A rock is thrown vertically into the air. At the top of its path the net force on it is

A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds. The speed of the car just before the brakes were applied was

A car by itself is capable of a certain maximum acceleration. When it tows a car of the same mass, its maximum acceleration is

In which case would you have the largest mass of gold? If your chunk of gold weighed 1 N on the

Scotty Skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about

Two factors that greatly affect air resistance on falling objects are frontal area and

Phil stands at rest with both feet on a scale that reads 500 N. When he gently lifts one foot, the scale reads

At equilibrium on a bathroom weighting scale, the downward pull of gravity on you is balanced by

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