Question 1

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 these 
A) 0 N. 
B) 0)1 N. 
C) 1 N. 
D) 9)8 N. 
E) none of these

Question 2

A ball is thrown vertically into the air.Because of air resistance,its time coming down compared to its time going up is

Accepted Answer

A) less. 
B) the same. 
C) more. 
A) less. 
B) the same. 
C) more.

Question 3

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 per second is

Accepted Answer

A) 0) 
B) 4)9. 
C) 9)8. 
D) infinite. 
E) none of these 
A) 0) 
B) 4)9. 
C) 9)8. 
D) infinite. 
E) none of these

Question 4

A heavy rock and a light rock of the same size are falling through the air from a tall building.The one that encounters the greatest air resistance is the

Accepted Answer

A) light rock. 
B) heavy rock. 
C) same for both 
A) light rock. 
B) heavy rock. 
C) same for both

Question 5

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales.The reading on each scale is

Accepted Answer

A) 200 N. 
B) 400 N. 
C) 800 N. 
D) 1600 N. 
E) none of these 
A) 200 N. 
B) 400 N. 
C) 800 N. 
D) 1600 N. 
E) none of these

Question 6

Two factors that greatly affect air resistance on falling objects are the

Accepted Answer

A) size and mass of the object. 
B) size and weight of the object. 
C) size and speed of the object. 
A) size and mass of the object. 
B) size and weight of the object. 
C) size and speed of the object.

Question 7

A coconut and a feather fall from a tree through the air to the ground below.The amount of air-resistance force is

Accepted Answer

A) greater on the coconut. 
B) greater on the feather. 
C) the same on each. 
A) greater on the coconut. 
B) greater on the feather. 
C) the same on each.

Question 8

When a falling object has reached its terminal velocity,its acceleration is

Accepted Answer

A) constant. 
B) zero. 
C) g) 
A) constant. 
B) zero. 
C) g)

Question 9

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 10

Compared to the mass of a certain object on Earth,the mass of the same object on the moon is

Accepted Answer

A) one sixth as much. 
B) the same. 
C) six times as much. 
D) zero. 
A) one sixth as much. 
B) the same. 
C) six times as much. 
D) zero.

Question 11

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

Accepted Answer

A) about 3. 
B) about 4. 
C) about 5. 
D) about 6. 
E) more than 6. 
A) about 3. 
B) about 4. 
C) about 5. 
D) about 6. 
E) more than 6.

Question 12

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

Accepted Answer

A) zero. 
B) 9)8. 
C) between 0 and 9.8. 
D) greater than 9.8. 
A) zero. 
B) 9)8. 
C) between 0 and 9.8. 
D) greater than 9.8.

Question 13

A jumbo jet has a mass of 100,000 kg.The thrust for each of its four engines is 50,000 N.What is the jet's acceleration in meters per second per second when taking off?

Accepted Answer

A) 0)25 
B) 1 
C) 2 
D) 4 
E) none of these 
A) 0)25 
B) 1 
C) 2 
D) 4 
E) none of these

Question 14

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 15

Neglecting friction,a large block of ice and a small block of ice start sliding down an incline together.The heavier block will get to the bottom

Accepted Answer

A) before the light block. 
B) after the light block. 
C) at the same time as the light block. 
A) before the light block. 
B) after the light block. 
C) at the same time as the light block.

Question 16

The human body can,under certain conditions,withstand an acceleration of 10 g.What net force would produce this acceleration of a 50-kg person?

Accepted Answer

A) about 500 N 
B) about 2500 N 
C) about 5000 N 
D) about 25,000 N 
E) none of these 
A) about 500 N 
B) about 2500 N 
C) about 5000 N 
D) about 25,000 N 
E) none of these

Question 17

A rocket becomes progressively easier to accelerate as it travels upward from the ground mainly because

Accepted Answer

A) gravity becomes weaker with increased distance. 
B) the applied force on the rocket increases as burning of fuel progresses. 
C) the mass of the rocket decreases as fuel is burned. 
A) gravity becomes weaker with increased distance. 
B) the applied force on the rocket increases as burning of fuel progresses. 
C) the mass of the rocket decreases as fuel is burned.

Question 18

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

Question 19

Which has the greater mass?

Accepted Answer

A) a king-size pillow 
B) an automobile battery 
C) neither - both have the same 
A) a king-size pillow 
B) an automobile battery 
C) neither - both have the same

Question 20

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

Accepted Answer

A) less than its weight. 
B) more than its weight. 
C) equal to its weight. 
A) less than its weight. 
B) more than its weight. 
C) equal to its weight.

Exam 4: Newtons Second Law of Motion: Force and Acceleration

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

A ball is thrown vertically into the air.Because of air resistance,its time coming down compared to its time going up is

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 per second is

A heavy rock and a light rock of the same size are falling through the air from a tall building.The one that encounters the greatest air resistance is the

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales.The reading on each scale is

Two factors that greatly affect air resistance on falling objects are the

A coconut and a feather fall from a tree through the air to the ground below.The amount of air-resistance force is

When a falling object has reached its terminal velocity,its acceleration is

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

Compared to the mass of a certain object on Earth,the mass of the same object on the moon is

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

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

A jumbo jet has a mass of 100,000 kg.The thrust for each of its four engines is 50,000 N.What is the jet's acceleration in meters per second per second when taking off?

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

Neglecting friction,a large block of ice and a small block of ice start sliding down an incline together.The heavier block will get to the bottom

The human body can,under certain conditions,withstand an acceleration of 10 g.What net force would produce this acceleration of a 50-kg person?

A rocket becomes progressively easier to accelerate as it travels upward from the ground mainly because

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?

Which has the greater mass?

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

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