Question 1

A skydiver steps from a helicopter and falls for a few seconds until he reaches his terminal velocity.Thereafter,until he opens his parachute,his acceleration

Accepted Answer

A) is constant. 
B) increases. 
C) decreases. 
D) is zero. 
E) none of these

Question 2

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

Question 3

An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward.The magnitude of the resultant force on the object is

Accepted Answer

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

Question 4

The brakes of a speeding truck are slammed on and it skids to a stop.If the truck were heavily loaded so that it had twice the total mass,the skidding distance would be

Accepted Answer

A) 1/2 as far. 
B) 1 1/2 times as far. 
C) 2 times as far. 
D) 4 times as far. 
E) the same.

Question 5

A falling skydiver of mass 100 kg experiences 500 N of air resistance.The acceleration of the skydiver is

Accepted Answer

A) 0)2 g. 
B) 0)3 g. 
C) 0)4 g. 
D) 0)5 g. 
E) more than 0.5 g.

Question 6

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

Accepted Answer

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

Question 7

A 10-kg brick and a 1-kg book are dropped in a vacuum.The force of gravity on the 10-kg brick is

Accepted Answer

A) the same as the force on the 1-kg book. 
B) 10 times as much. 
C) one-tenth as much. 
D) zero.

Question 8

An astronaut on another planet drops a 1-kg rock from rest.The astronaut notices that the rock falls 2 meters straight down in one second.On this planet,how much does the rock weigh?

Accepted Answer

A) 1 N 
B) 4 N 
C) 4)9 N 
D) 5 N

Question 9

A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree.What is the deceleration in meters per second per second of the car?

Accepted Answer

A) 110 
B) 220 
C) 800 
D) 880 
E) can't be solved without the mass of the car

Question 10

A 10-kilogram block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface and comes to rest.It takes the block 2 seconds to stop.The stopping force acting on the block is about

Accepted Answer

A) 5 N. 
B) 10 N. 
C) 25 N. 
D) 50 N. 
E) none of these

Question 11

The force required to maintain an object at a constant velocity in free space is equal to

Accepted Answer

A) zero. 
B) the mass of the object. 
C) the weight of the object. 
D) the force required to stop it. 
E) none of these

Question 12

A lightweight feather slides off a table and falls through the air until it reaches the floor.During the time of its fall,its acceleration

Accepted Answer

A) keeps increasing. 
B) keeps decreasing. 
C) never changes. 
D) is sometimes zero.

Question 13

A 10-N falling object encounters 4 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

Question 14

A push on a 1-kg brick accelerates it.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 these

Question 15

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.

Question 16

If an object of constant mass experiences a constant net force,it will have a constant

Accepted Answer

A) velocity. 
B) speed. 
C) acceleration. 
D) position. 
E) more than one of the above

Question 17

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.

Question 18

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 these 
E) none of these

Question 19

The maximum acceleration of a car while towing a second car twice its mass,compared to its acceleration with no car in tow,is

Accepted Answer

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

Question 20

A bag of groceries has a mass of 10 kilograms and a weight of

Accepted Answer

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

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