Question 1

In order to get an object moving, you must push harder on it than it pushes back on you.

Accepted Answer

A) True 
 B)False

Question 2

A block is on a frictionless table, on earth. The block accelerates at 3.0 m/  s2\mathrm { s } ^ { 2 }s2  when a  20 N20 \mathrm {~N}20 N  horizontal force is applied to it. The block and table are set up on the Moon where the acceleration due to gravity is 1.62 m/  s2\mathrm { s } ^ { 2 }s2  . The weight of the block on the Moon is closest to

Accepted Answer

A)  11 N.
B)  9.5 N.
C)  8.1 N.
D)  6.8 N.
E)  5.5 N. F) B) and C)
G) A) and E)

Question 3

If a net force accelerates a 4.5-kg tool at 40 m/s2, what acceleration would that same net force give to an 18-kg tool?

Accepted Answer

A)  180 m/s2
B)  10 m/s2
C)  160 m/s2
D)  9.8 m/s2
E)  32 m/s2F) B) and D)
G) A) and D)

Question 4

During a hard stop, a car and its passengers slow down with an acceleration of 8.0 m/s2. What magnitude force does a 50-kg passenger exert on the seat belt in such a stop?

Accepted Answer

Question 5

An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force on this object is 30 N to the left. What is the acceleration of the object?

Accepted Answer

A)  0.27 m/s2
B)  1.1 m/s2
C)  2.6 m/s2
D)  11 m/s2E) None of the above
F) All of the above

Question 6

If you pound a feather with a hammer, which one feels a greater force?

Accepted Answer

A)  always the feather
B)  always the hammer
C)  The size of the force is always exactly the same on both of them.
D)  If the feather moves, then it felt the greater force. Otherwise the force was the same on both.E) C) and D)
F) B) and D)

Question 7

A golf club hits a golf ball with a force of 2400 N, sending the ball into the air. The force exerted on the club by the ball must be less than 2400 N or else the ball would not have moved forward.

Accepted Answer

A) True 
 B)False

Question 8

Calculate the average force a bumper would have to exert to bring a 1200-kg car to rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph) .

Accepted Answer

A)  1.8 × 104 N
B)  1.6 × 104 N
C)  5.4 × 104 N
D)  6.5 × 105 N
E)  3.2 × 104 NF) A) and B)
G) A) and C)

Question 9

A 1200-kg car is pulling a 500-kg trailer along level ground. Friction of the road on the trailer is negligible. The car accelerates with an acceleration of 1.3 m/s2. What is the force exerted by the car on the trailer?

Accepted Answer

A)  550 N
B)  600 N
C)  650 N
D)  700 N
E)  750 NF) B) and C)
G) A) and E)

Question 10

A car of mass 1100 kg that is traveling at 27 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting on the car?

Accepted Answer

A)  690 N
B)  550 N
C)  410 N
D)  340 NE) A) and D)
F) A) and C)

Question 11

While flying horizontally in an airplane, you notice that a string dangling from the overhead luggage compartment hangs at rest at 15° away from the vertical toward the front of the plane. Using this observation, you can conclude that the airplane is

Accepted Answer

A)  moving forward.
B)  moving backward.
C)  accelerating forward.
D)  accelerating backward.
E)  not accelerating because the string is at rest.F) A) and D)
G) A) and C)

Question 12

A horse pulls a cart with force  F→\overrightarrow { \mathbf { F } }F  . As a result of this force the cart accelerates with constant acceleration. The magnitude of the force that the cart exerts on the horse

Accepted Answer

A)  is zero newtons.
B)  equal to the magnitude of  F→\overrightarrow { \mathbf { F } }F-16.7 32-27.7 63.7-33 95 0 1.3-.2 2.7-.5 4-.3 1.3-.5 2.3-.5 3 0 7.3 6.7 11 20 11 8 0 13.2-.8 15.5-2.5 2.3-1.7 4.2-5.5 5.5-11.5 2-13.3 5.7-27 11-41 14.7-44.7 39-84.5 73-119.5s73.7-60.2 119-75.5c6-2 9-5.7 9-11s-3-9-9-11c-45.3-15.3-85-40.5-119-75.5s-58.3-74.8-73-119.5c-4.7-14-8.3-27.3-11-40-1.3-6.7-3.2-10.8-5.5-12.5-2.3-1.7-7.5-2.5-15.5-2.5-14 0-21 3.7-21 11 0 2 2 10.3 6 25 20.7 83.3 67 151.7 139 205zm0 0v40h399900v-40z'/>  .
C)  less than the magnitude of  F→\overrightarrow { \mathbf { F } }F-16.7 32-27.7 63.7-33 95 0 1.3-.2 2.7-.5 4-.3 1.3-.5 2.3-.5 3 0 7.3 6.7 11 20 11 8 0 13.2-.8 15.5-2.5 2.3-1.7 4.2-5.5 5.5-11.5 2-13.3 5.7-27 11-41 14.7-44.7 39-84.5 73-119.5s73.7-60.2 119-75.5c6-2 9-5.7 9-11s-3-9-9-11c-45.3-15.3-85-40.5-119-75.5s-58.3-74.8-73-119.5c-4.7-14-8.3-27.3-11-40-1.3-6.7-3.2-10.8-5.5-12.5-2.3-1.7-7.5-2.5-15.5-2.5-14 0-21 3.7-21 11 0 2 2 10.3 6 25 20.7 83.3 67 151.7 139 205zm0 0v40h399900v-40z'/>  .
D)  greater than the magnitude of  F→\overrightarrow { \mathbf { F } }F-16.7 32-27.7 63.7-33 95 0 1.3-.2 2.7-.5 4-.3 1.3-.5 2.3-.5 3 0 7.3 6.7 11 20 11 8 0 13.2-.8 15.5-2.5 2.3-1.7 4.2-5.5 5.5-11.5 2-13.3 5.7-27 11-41 14.7-44.7 39-84.5 73-119.5s73.7-60.2 119-75.5c6-2 9-5.7 9-11s-3-9-9-11c-45.3-15.3-85-40.5-119-75.5s-58.3-74.8-73-119.5c-4.7-14-8.3-27.3-11-40-1.3-6.7-3.2-10.8-5.5-12.5-2.3-1.7-7.5-2.5-15.5-2.5-14 0-21 3.7-21 11 0 2 2 10.3 6 25 20.7 83.3 67 151.7 139 205zm0 0v40h399900v-40z'/>  .
E)  cannot be determined without knowing the mass of the horse. F) C) and E)
G) A) and D)

Question 13

A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s. What is the magnitude of the force exerted by the rope on the bucket?

Accepted Answer

A)  0.00 N
B)  2.0 N
C)  5.0 N
D)  10 N
E)  49 NF) A) and E)
G) None of the above

Question 14

You are standing in a moving bus, facing forward, when you suddenly slide forward as the bus comes to an immediate stop. What force caused you to slide forward?

Accepted Answer

A)  gravity
B)  the normal force due to your contact with the floor of the bus
C)  the force due to friction between you and the floor of the bus
D)  There is not a force causing you to slide forward.E) All of the above
F) A) and D)

Question 15

A block is on a frictionless table, on earth. The block accelerates at 5.3 m/  s2\mathrm { s } ^ { 2 }s2  when a  10 N10 \mathrm {~N}10 N  horizontal force is applied to it. The block and table are set up on the Moon where the acceleration due to gravity is 1.62 m/  s2\mathrm { s } ^ { 2 }s2  . A horizontal force of 5 N is now applied to the block when it is on the Moon. The acceleration imparted to the block by this force is closest to

Accepted Answer

A)  2.7 m/  s2\mathrm { s } ^ { 2 }s2  .
B)  2.4 m/  s2\mathrm { s } ^ { 2 }s2  .
C)  2.9 m/  s2\mathrm { s } ^ { 2 }s2  .
D)  3.2 m/  s2\mathrm { s } ^ { 2 }s2  .
E)  3.4 m/  s2\mathrm { s } ^ { 2 }s2  . F) A) and D)
G) A) and E)

Question 16

A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate. If this person is standing on a bathroom scale inside the elevator, what would the scale read?

Accepted Answer

A)  more than 700 N
B)  less than 700 N
C)  700 N
D)  It could be more or less than 700 N, depending on whether the magnitude of the acceleration is greater than or less than 9.8 m/s2.E) A) and B)
F) A) and C)

Question 17

A net force of 125 N is applied to a certain object. As a result, the object accelerates with an acceleration of 24.0 m/s2. The mass of the object is

Accepted Answer

A)  3000 kg.
B)  2880 kg.
C)  144 kg.
D)  0.200 kg.
E)  5.21 kg.F) C) and E)
G) B) and C)

Question 18

A box is placed on a table which rests on the floor. The box pushes on the table; the reaction force to the box's push on the table is the table's push on the floor.

Accepted Answer

A) True 
 B)False

Question 19

The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can apply a horizontal force  F→\overrightarrow { \mathbf { F } }F  either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is 1 > m2, that are on a level frictionless surface. We can apply a horizontal force  \overrightarrow { \mathbf { F } }  either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is   A) zero newtons in either case. B) larger if  \overrightarrow { \mathbf { F } }  is applied toward the right. C) larger if  \overrightarrow { \mathbf { F } }  is applied toward the left. D) the same in either case. " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  zero newtons in either case.
B)  larger if  F→\overrightarrow { \mathbf { F } }F-16.7 32-27.7 63.7-33 95 0 1.3-.2 2.7-.5 4-.3 1.3-.5 2.3-.5 3 0 7.3 6.7 11 20 11 8 0 13.2-.8 15.5-2.5 2.3-1.7 4.2-5.5 5.5-11.5 2-13.3 5.7-27 11-41 14.7-44.7 39-84.5 73-119.5s73.7-60.2 119-75.5c6-2 9-5.7 9-11s-3-9-9-11c-45.3-15.3-85-40.5-119-75.5s-58.3-74.8-73-119.5c-4.7-14-8.3-27.3-11-40-1.3-6.7-3.2-10.8-5.5-12.5-2.3-1.7-7.5-2.5-15.5-2.5-14 0-21 3.7-21 11 0 2 2 10.3 6 25 20.7 83.3 67 151.7 139 205zm0 0v40h399900v-40z'/>  is applied toward the right.
C)  larger if  F→\overrightarrow { \mathbf { F } }F-16.7 32-27.7 63.7-33 95 0 1.3-.2 2.7-.5 4-.3 1.3-.5 2.3-.5 3 0 7.3 6.7 11 20 11 8 0 13.2-.8 15.5-2.5 2.3-1.7 4.2-5.5 5.5-11.5 2-13.3 5.7-27 11-41 14.7-44.7 39-84.5 73-119.5s73.7-60.2 119-75.5c6-2 9-5.7 9-11s-3-9-9-11c-45.3-15.3-85-40.5-119-75.5s-58.3-74.8-73-119.5c-4.7-14-8.3-27.3-11-40-1.3-6.7-3.2-10.8-5.5-12.5-2.3-1.7-7.5-2.5-15.5-2.5-14 0-21 3.7-21 11 0 2 2 10.3 6 25 20.7 83.3 67 151.7 139 205zm0 0v40h399900v-40z'/>  is applied toward the left.
D)  the same in either case. E) A) and C)
F) A) and B)

Question 20

When a 45-kg person steps on a scale in an elevator, the scale reads a steady 480 N. Which of the following statements must be true? (There could be more than one correct choice.)

Accepted Answer

A)  The elevator is accelerating upward at a constant rate.
B)  The elevator is accelerating downward at a constant rate.
C)  The elevator is moving upward at a constant rate.
D)  From the given information, we cannot tell if the elevator is moving up or down.E) C) and D)
F) B) and C)

Exam 4: Forces and Newtons Laws of Motion

You are standing in a moving bus, facing forward, when you suddenly slide forward as the bus comes to an immediate stop. What force caused you to slide forward?

Correct Answer
verified

A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate. If this person is standing on a bathroom scale inside the elevator, what would the scale read?

Correct Answer
verified

While flying horizontally in an airplane, you notice that a string dangling from the overhead luggage compartment hangs at rest at 15° away from the vertical toward the front of the plane. Using this observation, you can conclude that the airplane is

Correct Answer
verified

A net force of 125 N is applied to a certain object. As a result, the object accelerates with an acceleration of 24.0 m/s². The mass of the object is

Correct Answer
verified

Correct Answer
verified

During a hard stop, a car and its passengers slow down with an acceleration of 8.0 m/s². What magnitude force does a 50-kg passenger exert on the seat belt in such a stop?

Correct Answer
verified

A car of mass 1100 kg that is traveling at 27 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting on the car?

Correct Answer
verified

If a net force accelerates a 4.5-kg tool at 40 m/s², what acceleration would that same net force give to an 18-kg tool?

Correct Answer
verified

A horse pulls a cart with force $\overrightarrow { \mathbf { F } }$ . As a result of this force the cart accelerates with constant acceleration. The magnitude of the force that the cart exerts on the horse

Correct Answer
verified

Correct Answer
verified

A box is placed on a table which rests on the floor. The box pushes on the table; the reaction force to the box's push on the table is the table's push on the floor.

Correct Answer
verified

Calculate the average force a bumper would have to exert to bring a 1200-kg car to rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph) .

Correct Answer
verified

If you pound a feather with a hammer, which one feels a greater force?

Correct Answer
verified

A 1200-kg car is pulling a 500-kg trailer along level ground. Friction of the road on the trailer is negligible. The car accelerates with an acceleration of 1.3 m/s². What is the force exerted by the car on the trailer?

Correct Answer
verified

In order to get an object moving, you must push harder on it than it pushes back on you.

Correct Answer
verified

A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s. What is the magnitude of the force exerted by the rope on the bucket?

Correct Answer
verified

An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force on this object is 30 N to the left. What is the acceleration of the object?

Correct Answer
verified

Correct Answer
verified

A golf club hits a golf ball with a force of 2400 N, sending the ball into the air. The force exerted on the club by the ball must be less than 2400 N or else the ball would not have moved forward.

Correct Answer
verified

When a 45-kg person steps on a scale in an elevator, the scale reads a steady 480 N. Which of the following statements must be true? (There could be more than one correct choice.)

Correct Answer
verified

Exam 4: Forces and Newtons Laws of Motion

You are standing in a moving bus, facing forward, when you suddenly slide forward as the bus comes to an immediate stop. What force caused you to slide forward?

Correct AnswerverifiedShow Answer

A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate. If this person is standing on a bathroom scale inside the elevator, what would the scale read?

Correct AnswerverifiedShow Answer

While flying horizontally in an airplane, you notice that a string dangling from the overhead luggage compartment hangs at rest at 15° away from the vertical toward the front of the plane. Using this observation, you can conclude that the airplane is

Correct AnswerverifiedShow Answer

A net force of 125 N is applied to a certain object. As a result, the object accelerates with an acceleration of 24.0 m/s2. The mass of the object is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

During a hard stop, a car and its passengers slow down with an acceleration of 8.0 m/s2. What magnitude force does a 50-kg passenger exert on the seat belt in such a stop?

Correct AnswerverifiedShow Answer

A car of mass 1100 kg that is traveling at 27 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting on the car?

Correct AnswerverifiedShow Answer

If a net force accelerates a 4.5-kg tool at 40 m/s2, what acceleration would that same net force give to an 18-kg tool?

Correct AnswerverifiedShow Answer

A horse pulls a cart with force F→\overrightarrow { \mathbf { F } }F . As a result of this force the cart accelerates with constant acceleration. The magnitude of the force that the cart exerts on the horse

Correct AnswerverifiedShow Answer

The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can apply a horizontal force F→\overrightarrow { \mathbf { F } }F either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is

Correct AnswerverifiedShow Answer

A box is placed on a table which rests on the floor. The box pushes on the table; the reaction force to the box's push on the table is the table's push on the floor.

Correct AnswerverifiedShow Answer

Calculate the average force a bumper would have to exert to bring a 1200-kg car to rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph) .

Correct AnswerverifiedShow Answer

If you pound a feather with a hammer, which one feels a greater force?

Correct AnswerverifiedShow Answer

A 1200-kg car is pulling a 500-kg trailer along level ground. Friction of the road on the trailer is negligible. The car accelerates with an acceleration of 1.3 m/s2. What is the force exerted by the car on the trailer?

Correct AnswerverifiedShow Answer

In order to get an object moving, you must push harder on it than it pushes back on you.

Correct AnswerverifiedShow Answer

A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s. What is the magnitude of the force exerted by the rope on the bucket?

Correct AnswerverifiedShow Answer

An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force on this object is 30 N to the left. What is the acceleration of the object?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A golf club hits a golf ball with a force of 2400 N, sending the ball into the air. The force exerted on the club by the ball must be less than 2400 N or else the ball would not have moved forward.

Correct AnswerverifiedShow Answer

When a 45-kg person steps on a scale in an elevator, the scale reads a steady 480 N. Which of the following statements must be true? (There could be more than one correct choice.)

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A net force of 125 N is applied to a certain object. As a result, the object accelerates with an acceleration of 24.0 m/s². The mass of the object is

Correct Answer
verified

Correct Answer
verified

During a hard stop, a car and its passengers slow down with an acceleration of 8.0 m/s². What magnitude force does a 50-kg passenger exert on the seat belt in such a stop?

Correct Answer
verified

Correct Answer
verified

If a net force accelerates a 4.5-kg tool at 40 m/s², what acceleration would that same net force give to an 18-kg tool?

Correct Answer
verified

A horse pulls a cart with force $\overrightarrow { \mathbf { F } }$ . As a result of this force the cart accelerates with constant acceleration. The magnitude of the force that the cart exerts on the horse

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A 1200-kg car is pulling a 500-kg trailer along level ground. Friction of the road on the trailer is negligible. The car accelerates with an acceleration of 1.3 m/s². What is the force exerted by the car on the trailer?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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