Question 1

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

Accepted Answer

A) 500 N 
B) 2500 N 
C) 5000 N 
D) 25,000 N 
E) none of the above 
A) 500 N 
B) 2500 N 
C) 5000 N 
D) 25,000 N 
E) none of the above C

Question 2

A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car?

Accepted Answer

A) 500 N 
B) 1000 N 
C) 1500 N 
D) 2000 N 
E) none of these 
A) 500 N 
B) 1000 N 
C) 1500 N 
D) 2000 N 
E) none of these D

Question 3

An astronaut on another planet drops a 1-kg rock from rest and finds that it falls a vertical distance of 2.5 meters in one second. On this planet, the rock has a weight of

Accepted Answer

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

Question 4

A rock weighs 30 N on Earth and another rock weighs 30 N on the Moon. Which rock 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 
A) the one on Earth 
B) the one on the Moon 
C) They have the same mass. 
D) not enough information

Question 5

A single brick falls with acceleration g. The reason a double brick falls with the same acceleration is

Accepted Answer

A) that in free fall all accelerations are g. 
B) its ratio of force to mass is the same. 
C) an experimental fact tested many times. 
D) none of the above 
A) that in free fall all accelerations are g. 
B) its ratio of force to mass is the same. 
C) an experimental fact tested many times. 
D) none of the above

Question 6

A push on a 1-kg brick accelerates it. Neglecting friction, equally accelerating a 10-kg brick requires

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 7

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 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 8

A heavy block at rest is suspended by a vertical rope. When the block accelerates upward by the rope, the rope tension

Accepted Answer

A) is less than its weight. 
B) equals its weight. 
C) is greater than its weight. 
A) is less than its weight. 
B) equals its weight. 
C) is greater than its weight.

Question 9

Compared to the mass of an apple on Earth, the mass of the apple 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 10

A large and a small person wish to parachute at equal terminal velocities. The larger person should

Accepted Answer

A) get a larger parachute. 
B) jump lightly. 
C) pull upward on the supporting strands to decrease the downward net force. 
D) jump first from the plane. 
A) get a larger parachute. 
B) jump lightly. 
C) pull upward on the supporting strands to decrease the downward net force. 
D) jump first from the plane.

Question 11

A skydiver's terminal velocity will be greatest if she falls

Accepted Answer

A) head first. 
B) lying flat on her back. 
C) lying flat on her stomach. 
D) with her parachute open. 
A) head first. 
B) lying flat on her back. 
C) lying flat on her stomach. 
D) with her parachute open.

Question 12

A heavy ball hangs by a string, with a second string attached to its bottom. A slow pull on the bottom string breaks the

Accepted Answer

A) top string. 
B) bottom string. 
C) top or bottom string equally. 
A) top string. 
B) bottom string. 
C) top or bottom string equally.

Question 13

If the net force on a cart is tripled, the cart's acceleration

Accepted Answer

A) is one third. 
B) is two thirds. 
C) is three times as much. 
D) is more than three times as much. 
A) is one third. 
B) is two thirds. 
C) is three times as much. 
D) is more than three times as much.

Question 14

Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her 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 15

Strange as it may seem, it is just as difficult to accelerate a car on a level surface on the Moon as it is here on Earth because

Accepted Answer

A) the mass of the car is independent of gravity. 
B) the weight of the car is independent of gravity. 
C) both of these 
D) neither of these 
A) the mass of the car is independent of gravity. 
B) the weight of the car is independent of gravity. 
C) both of these 
D) neither of these

Question 16

Neglecting friction, a small and a large block of ice begin sliding down an incline together. The larger block reaches the bottom

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s2. What is the mass of the car?

Accepted Answer

A) 500 kg 
B) 1000 kg 
C) 1500 kg 
D) 3000 kg 
E) none of these 
A) 500 kg 
B) 1000 kg 
C) 1500 kg 
D) 3000 kg 
E) none of these

Question 19

A coconut and a bird's feather fall from a tree through the air to the ground below. The force of air resistance 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 20

You drive your car at a constant 60 km/h along the highway. You apply the brakes until the car slows to 40 km/h. If at that moment you suddenly release the brakes, the car tends to

Accepted Answer

A) momentarily regain its higher initial speed. 
B) continue moving at 40 km/h. 
C) decrease in speed if no other forces act. 
A) momentarily regain its higher initial speed. 
B) continue moving at 40 km/h. 
C) decrease in speed if no other forces act.

Exam 4: Newtons Second Law of Motion

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

A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car?

An astronaut on another planet drops a 1-kg rock from rest and finds that it falls a vertical distance of 2.5 meters in one second. On this planet, the rock has a weight of

A rock weighs 30 N on Earth and another rock weighs 30 N on the Moon. Which rock has the greater mass?

A single brick falls with acceleration g. The reason a double brick falls with the same acceleration is

A push on a 1-kg brick accelerates it. Neglecting friction, equally accelerating a 10-kg brick requires

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?

A heavy block at rest is suspended by a vertical rope. When the block accelerates upward by the rope, the rope tension

Compared to the mass of an apple on Earth, the mass of the apple on the Moon is

A large and a small person wish to parachute at equal terminal velocities. The larger person should

A skydiver's terminal velocity will be greatest if she falls

A heavy ball hangs by a string, with a second string attached to its bottom. A slow pull on the bottom string breaks the

If the net force on a cart is tripled, the cart's acceleration

Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration

Strange as it may seem, it is just as difficult to accelerate a car on a level surface on the Moon as it is here on Earth because

Neglecting friction, a small and a large block of ice begin sliding down an incline together. The larger block reaches the bottom

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

A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s2. What is the mass of the car?

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

You drive your car at a constant 60 km/h along the highway. You apply the brakes until the car slows to 40 km/h. If at that moment you suddenly release the brakes, the car tends to

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A car has a mass of 1000 kg and accelerates at 2 m/s². What net force is exerted on the car?

A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s². What is the mass of the car?