Question 1

An object with twice as much mass as another object has twice as much

Accepted Answer

A)  inertia.
B)  speed.
C)  acceleration due to gravity.
D)  all of the aboveE) None of the above
F) All of the above

Question 2

A 1-kg mass at the Earth's surface weighs

Accepted Answer

A)  1 N.
B)  5 N.
C)  10 N.
D)  12 N.
E)  none of the aboveF) A) and E)
G) B) and C)

Question 3

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has the same

Accepted Answer

A)  mass.
B)  volume.
C)  weight.
D)  all of the above
E)  none of the aboveF) A) and B)
G) All of the above

Question 4

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 when taking off?

Accepted Answer

A)  0.25 m/s2
B)  1 m/s2
C)  2 m/s2
D)  4 m/s2
E)  none of the aboveF) D) and E)
G) A) and E)

Question 5

If you double the net force on an object, you'll double its

Accepted Answer

A)  acceleration.
B)  speed.
C)  velocity.
D)  all the aboveE) A) and B)
F) A) and C)

Question 6

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 bothD) None of the above
E) All of the above

Question 7

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)  half as far.
B)  1.5 times as far.
C)  twice as far.
D)  4 times as far.
E)  the same.F) B) and E)
G) C) and D)

Question 8

Two tennis balls fall through the air from a tall building. One of them is filled with lead pellets. The ball to reach the ground first is the

Accepted Answer

A)  regular ball.
B)  lead-filled ball.
C)  same for bothD) All of the above
E) A) and B)

Question 9

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)  5 N
D)  10 NE) C) and D)
F) B) and D)

Question 10

A ball is thrown upwards and caught when it returns. Compared with its initial speed and in the presence of air resistance, the speed with which it is caught is always

Accepted Answer

A)  less.
B)  the same.
C)  more.
D)  can't be determined.E) None of the above
F) A) and B)

Question 11

A 10-N block and a 1-N block lie on a horizontal frictionless table. To impart equal horizontal accelerations, we would have to push the heavier block with

Accepted Answer

A)  an equal force.
B)  10 times as much force.
C)  10 squared or 100 times as much force.
D)  1/10 as much force.
E)  none of the aboveF) B) and C)
G) A) and E)

Question 12

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

Accepted Answer

A)  is constant.
B)  increases.
C)  decreases.
D)  is zero.
E)  none of the aboveF) A) and B)
G) C) and D)

Question 13

What horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight?

Accepted Answer

A)  600 N
B)  1600 N
C)  2000 N
D)  2400 N
E)  none of the aboveF) B) and D)
G) B) and C)

Question 14

An object's weight is properly expressed in units of

Accepted Answer

A)  meters.
B)  kilograms.
C)  newtons.
D)  cubic centimeters.E) A) and D)
F) C) and D)

Question 15

A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is

Accepted Answer

A)  30 N.
B)  300 N.
C)  3000 N.
D)  more than 3000 N.E) A) and B)
F) A) and C)

Question 16

Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction. The particle with both forces acting

Accepted Answer

A)  is brought to a rapid halt.
B)  decelerates gradually to a halt.
C)  continues at the speed it had when it encountered the second force.
D)  theoretically tends to accelerate toward the speed of light.
E)  none of the aboveF) C) and D)
G) C) and E)

Question 17

An apple weighs 1 N. When the apple is held at rest above your head, the net force on the apple is

Accepted Answer

A)  0 N.
B)  0.1 N.
C)  1 N.
D)  9.8 N.
E)  none of the aboveF) D) and E)
G) B) and D)

Question 18

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 the aboveF) All of the above
G) None of the above

Question 19

A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is

Accepted Answer

A)  1 m/s2.
B)  2 m/s2.
C)  5 m/s2.
D)  10 m/s2.
E)  none of the aboveF) A) and B)
G) C) and D)

Question 20

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 the aboveF) All of the above
G) A) and E)

Exam 4: Newtons Second Law of Motion

A ball is thrown upwards and caught when it returns. Compared with its initial speed and in the presence of air resistance, the speed with which it is caught is always

Correct AnswerverifiedShow Answer

What horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight?

Correct AnswerverifiedShow Answer

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has the same

Correct AnswerverifiedShow Answer

A 1-kg mass at the Earth's surface weighs

Correct AnswerverifiedShow Answer

Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction. The particle with both forces acting

Correct AnswerverifiedShow Answer

Two tennis balls fall through the air from a tall building. One of them is filled with lead pellets. The ball to reach the ground first is the

Correct AnswerverifiedShow Answer

A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A 10-N block and a 1-N block lie on a horizontal frictionless table. To impart equal horizontal accelerations, we would have to push the heavier block with

Correct AnswerverifiedShow Answer

An apple weighs 1 N. When the apple is held at rest above your head, the net force on the apple is

Correct AnswerverifiedShow Answer

A 10-N falling object encounters 4 N of air resistance. The net force on the object is

Correct AnswerverifiedShow Answer

If you double the net force on an object, you'll double its

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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 when taking off?

Correct AnswerverifiedShow Answer

An object's weight is properly expressed in units of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An object with twice as much mass as another object has twice as much

Correct AnswerverifiedShow Answer

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What horizontally-applied force will accelerate a 400-kg crate at 1 m/s² across a factory floor against a friction force half its weight?

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