Question 1

An apple weighs 1 N. The magnitude of 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) 10 N. 
E) none of the above 
A) 0 N. 
B) 0)1 N. 
C) 1 N. 
D) 10 N. 
E) none of the above

Question 2

A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration in meters per second squared?

Accepted Answer

A) 0)3 
B) 3)0 
C) 10 
D) 30 
E) 300 
A) 0)3 
B) 3)0 
C) 10 
D) 30 
E) 300

Question 3

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 a state of zero acceleration first?

Accepted Answer

A) the light woman 
B) the heavy man 
C) both should at the same time 
D) not enough information 
A) the light woman 
B) the heavy man 
C) both should at the same time 
D) not enough information

Question 4

As a rocket continues to burn fuel, a constant thrust gives it an increased acceleration. Why is this so and what principle is involved?

Accepted Answer

In accord with Newton's Second

Question 5

A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the

Accepted Answer

A) player's grip on the glove. 
B) force the glove exerts on the ball. 
C) friction of the ground against the player's shoes. 
D) muscular effort in the player's arms. 
E) none of the above 
A) player's grip on the glove. 
B) force the glove exerts on the ball. 
C) friction of the ground against the player's shoes. 
D) muscular effort in the player's arms. 
E) none of the above

Question 6

A skydiver jumps from a high-flying plane. As the velocity of her fall increases, the acceleration

Accepted Answer

A) increases. 
B) decreases. 
C) remains unchanged regardless of air resistance. 
A) increases. 
B) decreases. 
C) remains unchanged regardless of air resistance.

Question 7

An object maintains its state of motion because it has

Accepted Answer

A) mass. 
B) weight. 
C) speed. 
D) acceleration. 
E) all of the above 
A) mass. 
B) weight. 
C) speed. 
D) acceleration. 
E) all of the above

Question 8

A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor

Accepted Answer

A) exactly below the midpoint of the ceiling. 
B) ahead of the midpoint of the ceiling. 
C) behind the midpoint of the ceiling. 
D) more information needed to solve this problem 
E) none of the above 
A) exactly below the midpoint of the ceiling. 
B) ahead of the midpoint of the ceiling. 
C) behind the midpoint of the ceiling. 
D) more information needed to solve this problem 
E) none of the above

Question 9

On the surface of Jupiter, where the acceleration due to gravity is about three times that of Earth, a 100-kg rock would have a weight of about

Accepted Answer

A) 1000 N. 
B) 3000 N. 
C) 6000 N. 
D) 9000 N. 
A) 1000 N. 
B) 3000 N. 
C) 6000 N. 
D) 9000 N.

Question 10

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

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.

Question 11

Two books are tied together with a length of string. With the string taut, one book is pushed off the edge of a table. As it falls, the other book is dragged horizontally across the table surface. With no friction, acceleration of the books is

Accepted Answer

A) zero. 
B) g/2. 
C) g) 
D) a value between zero and g. 
E) a value that could be greater than g. 
A) zero. 
B) g/2. 
C) g) 
D) a value between zero and g. 
E) a value that could be greater than g.

Question 12

An elephant and a feather fall from a tree through the air to the ground below. The amount of air-resistance force is greater on the

Accepted Answer

A) elephant. 
B) feather. 
C) is the same on each 
A) elephant. 
B) feather. 
C) is the same on each

Question 13

The vector quantity is represented by

Accepted Answer

A) beta sequencing. 
B) a line. 
C) time over distance. 
D) an arrow. 
A) beta sequencing. 
B) a line. 
C) time over distance. 
D) an arrow.

Question 14

A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push with

Accepted Answer

A) just as much force. 
B) 10 times as much force. 
C) 100 times as much force. 
D) one-tenth the amount of force. 
E) none of the above 
A) just as much force. 
B) 10 times as much force. 
C) 100 times as much force. 
D) one-tenth the amount of force. 
E) none of the above

Question 15

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second squared is

Accepted Answer

A) 0) 
B) 5) 
C) 10. 
D) infinite. 
E) none of the above 
A) 0) 
B) 5) 
C) 10. 
D) infinite. 
E) none of the above

Question 16

The force exerted on the tires of a car to directly accelerate it along a road is exerted by the

Accepted Answer

A) engine. 
B) tires. 
C) air. 
D) road. 
E) none of the above 
A) engine. 
B) tires. 
C) air. 
D) road. 
E) none of the above

Question 17

When a ball rolls down an incline, it gains speed but its acceleration remains constant. Is this true? Explain.

Accepted Answer

Yes, it's true if the incline is free fr

Question 18

Suppose you're coasting in a car at 60 km/h and apply the brakes until you slow to 40 km/h. When you suddenly release the brake, the car tends to

Accepted Answer

A) momentarily regain its higher initial speed. 
B) continue moving at 40 km/h in the absence of forces. 
C) decrease in speed whether or not other forces act. 
A) momentarily regain its higher initial speed. 
B) continue moving at 40 km/h in the absence of forces. 
C) decrease in speed whether or not other forces act.

Question 19

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

Question 20

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

Exam 3: Newtons Laws of Motion

An apple weighs 1 N. The magnitude of net force on the apple when it is in free-fall is

A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration in meters per second squared?

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 a state of zero acceleration first?

As a rocket continues to burn fuel, a constant thrust gives it an increased acceleration. Why is this so and what principle is involved?

A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the

A skydiver jumps from a high-flying plane. As the velocity of her fall increases, the acceleration

An object maintains its state of motion because it has

A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor

On the surface of Jupiter, where the acceleration due to gravity is about three times that of Earth, a 100-kg rock would have a weight of about

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

Two books are tied together with a length of string. With the string taut, one book is pushed off the edge of a table. As it falls, the other book is dragged horizontally across the table surface. With no friction, acceleration of the books is

An elephant and a feather fall from a tree through the air to the ground below. The amount of air-resistance force is greater on the

The vector quantity is represented by

A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push with

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second squared is

The force exerted on the tires of a car to directly accelerate it along a road is exerted by the

When a ball rolls down an incline, it gains speed but its acceleration remains constant. Is this true? Explain.

Suppose you're coasting in a car at 60 km/h and apply the brakes until you slow to 40 km/h. When you suddenly release the brake, the car tends to

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

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

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