Question 1

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

Accepted Answer

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

Question 2

When a squid pushes against water, the squid moves forward because

Accepted Answer

A)  its tentacles apply a strong force to the water.
B)  its muscles flex.
C)  the water pushes against the squid.
D)  it swims using principles of flotation.

Question 3

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)  ten times as much as the force on the 1-kg book.
C)  zero.

Question 4

A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in meters per second squared is

Accepted Answer

A)  less than g.
B)  g) 
C)  more than g.

Question 5

A car traveling at 22 m/s comes to an abrupt halt in 0.1 s when it hits a tree. What is the deceleration in meters per second squared 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 6

A skydiver falls toward Earth. The attraction of Earth on the skydiver pulls the skydiver down. What is the reaction to this force?

Accepted Answer

A)  air resistance the diver encounters while falling
B)  water resistance that will soon act upward on the diver
C)  the attraction to the planets, stars, and every particle in the universe
D)  all of the above
E)  none of the above

Question 7

Gliding animals have evolved structures that

Accepted Answer

A)  increase their surface area.
B)  slow their fall.
C)  increase their air resistance.
D)  all of the above

Question 8

As a ball falls, the action force is the pull of Earth's mass on the ball. The reaction force is

Accepted Answer

A)  the air resistance acting against the ball.
B)  the acceleration of the ball.
C)  the pull of the ball's mass on Earth.
D)  nonexistent in this case.
E)  none of the above

Question 9

A 10-N block and a 1-N block lie on a horizontal frictionless table. To push them with equal acceleration, we would have to push with

Accepted Answer

A)  equal forces on each block.
B)  10 times as much force on the heavier block.
C)  10 squared or 100 times as much force on the heavier block.
D)  one-tenth as much force on the heavier block.
E)  none of the above

Question 10

Explain the changes in acceleration for an object falling in air as it gains speed.

Accepted Answer

A falling object experiences the least a...

Question 11

What horizontal 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 above

Question 12

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that

Accepted Answer

A)  the milk carton has no acceleration.
B)  there is an action-reaction pair of forces.
C)  gravity tends to hold the milk carton secure.
D)  the milk carton has inertia.
E)  none of the above

Question 13

An object following a straight-line path at constant speed

Accepted Answer

A)  has a net force acting upon it in the direction of motion.
B)  has zero acceleration.
C)  must be moving in a vacuum or in the absence of air drag.
D)  has no forces acting on it.
E)  none of the above

Question 14

If an object falls with constant acceleration, the velocity of the object must

Accepted Answer

A)  be constant also.
B)  continually change by the same amount each second.
C)  continually change by varying amounts, depending on its speed.
D)  continually decrease.
E)  none of the above

Question 15

A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of

Accepted Answer

A)  less than 1000 N.
B)  more than 1000 N.
C)  1000 N.

Question 16

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

Accepted Answer

A)  about 0.
B)  about 10.
C)  between 0 and 10.
D)  greater than 10.
E)  none of the above

Question 17

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 of the first force. The particle with both forces acting on it

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 above

Question 18

A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the ball when it is half way to the top of its path is about

Accepted Answer

A)  1/2 N.
B)  1 N.
C)  5 N.
D)  7) 5 N.
E)  10 N.

Question 19

A feather and a coin will have equal accelerations when falling in a vacuum because

Accepted Answer

A)  their velocities are the same.
B)  the force of gravity is the same for each in a vacuum.
C)  the force of gravity does not act in a vacuum.
D)  the ratio of each object's weight to its mass is the same.
E)  none of the above

Question 20

The weight of 0.6 kg of salami is about

Accepted Answer

A)  0) 06 N.
B)  6) 0 N.
C)  60 N.
D)  600 N.

Exam 3: Newtons Laws of Motion

A skydiver falls toward Earth. The attraction of Earth on the skydiver pulls the skydiver down. What is the reaction to this force?

Correct AnswerverifiedShow Answer

As a ball falls, the action force is the pull of Earth's mass on the ball. The reaction force is

Correct AnswerverifiedShow Answer

What horizontal 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

A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of

Correct AnswerverifiedShow Answer

An object following a straight-line path at constant speed

Correct AnswerverifiedShow Answer

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that

Correct AnswerverifiedShow Answer

Explain the changes in acceleration for an object falling in air as it gains speed.

Correct AnswerverifiedA falling object experiences the least a...View AnswerShow Answer

A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in meters per second squared is

Correct AnswerverifiedShow Answer

The weight of 0.6 kg of salami is about

Correct AnswerverifiedShow Answer

Gliding animals have evolved structures that

Correct AnswerverifiedShow Answer

A 10-N block and a 1-N block lie on a horizontal frictionless table. To push them with equal acceleration, we would have to push with

Correct AnswerverifiedShow Answer

When a squid pushes against water, the squid moves forward because

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A feather and a coin will have equal accelerations when falling in a vacuum because

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If an object falls with constant acceleration, the velocity of the object must

Correct AnswerverifiedShow Answer

A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the ball when it is half way to the top of its path is about

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 of the first force. The particle with both forces acting on it

Correct AnswerverifiedShow Answer

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A falling object experiences the least a...
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