Question 1

An object of mass m rests on a flat table.The earth pulls on this object,exerting a force of magnitude mg.What is the Newton's third law pair force to this pull?

Accepted Answer

A) The table pushing up on the object exerting the force mg. 
B) The object pushing down on the table exerting the force mg. 
C) The table pushing down on the floor exerting the force mg. 
D) The object pulling upward on the Earth exerting the force mg. 
E) The table pulling upward on the Earth exerting the force mg. 
A) The table pushing up on the object exerting the force mg. 
B) The object pushing down on the table exerting the force mg. 
C) The table pushing down on the floor exerting the force mg. 
D) The object pulling upward on the Earth exerting the force mg. 
E) The table pulling upward on the Earth exerting the force mg.

Question 2

A flatbed truck is carrying an 800-kg load of timber that is not tied down.The maximum friction force that the truck bed exerts on the load is 2400 N.What is the greatest acceleration that the truck can have without losing its load?

Accepted Answer

The answer of A flatbed truck is carrying an 800-kg...

Question 3

In a certain particle accelerator,a proton reaches an acceleration of 9.0 × 1013 m/s2.The mass of a proton is 1.67 × 10-27 kg.What is the sum of the forces exerted on the proton?

Accepted Answer

Question 4

If the sum of the forces exerted on a 4.5-kg tool accelerates it at 40 m/s2,what acceleration would that same sum of the forces 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/s2 
A) 180 m/s2 
B) 10 m/s2 
C) 160 m/s2 
D) 9.8 m/s2 
E) 32 m/s2

Question 5

A 20-ton truck collides with a 1500-lb car.Which of the following statements must be true?

Accepted Answer

A) During the collision, the force exerted by the car on the truck is greater than the force exerted by the truck on the car. 
B) During the collision, the force exerted on the truck by the car is equal to the force exerted on the car by the truck. 
C) During the collision, the force that the car exerts on the truck is smaller than the force that he truck exerts on the car. 
D) The truck did not slow down during the collision, but the car did. 
E) The car did not slow down during the collision, but the truck did. 
A) During the collision, the force exerted by the car on the truck is greater than the force exerted by the truck on the car. 
B) During the collision, the force exerted on the truck by the car is equal to the force exerted on the car by the truck. 
C) During the collision, the force that the car exerts on the truck is smaller than the force that he truck exerts on the car. 
D) The truck did not slow down during the collision, but the car did. 
E) The car did not slow down during the collision, but the truck did.

Question 6

A person who normally weighs 700 N is riding in a rather swift elevator that is moving at a constant speed of 9.8 m/s.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 elevator is going up or down. 
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 elevator is going up or down.

Question 7

A 1200-kg car is pulling a 500-kg trailer along level ground.Neglect the friction force exerted by the road on the trailer.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 N 
A) 550 N 
B) 600 N 
C) 650 N 
D) 700 N 
E) 750 N

Question 8

A horse pulls a cart with force $\overrightarrow { \mathrm { F } }$ 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) is equal to the magnitude of $\overrightarrow { \mathrm { F } }$ 
C) is less than the magnitude of $\overrightarrow { \mathrm { F } }$ 
D) is greater than the magnitude of $\overrightarrow { \mathrm { F } }$ 
E) cannot be determined without knowing the mass of the horse. 
A) is zero newtons. 
B) is equal to the magnitude of $\overrightarrow { \mathrm { F } }$ 
C) is less than the magnitude of $\overrightarrow { \mathrm { F } }$ 
D) is greater than the magnitude of $\overrightarrow { \mathrm { F } }$ 
E) cannot be determined without knowing the mass of the horse.

Question 9

A block is on a frictionless table,on earth.The block accelerates at 3.0 m/ $\mathrm { s }^2$ when a $20 \mathrm {~N}$ horizontal force is exerted on it.The block and table are set up on the Moon,where the acceleration of objects due to the gravitational attraction is 1.62 m/ $\mathrm { s }^2$ 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. 
A) 11 N. 
B) 9.5 N. 
C) 8.1 N. 
D) 6.8 N. 
E) 5.5 N.

Question 10

The acceleration of objects due to the gravitational force exerted on them is lower on the Moon than on Earth.Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface,compared to Earth?

Accepted Answer

A) Mass is less, weight is the same. 
B) Mass is the same, weight is less. 
C) Both mass and weight are less. 
D) Both mass and weight are the same. 
A) Mass is less, weight is the same. 
B) Mass is the same, weight is less. 
C) Both mass and weight are less. 
D) Both mass and weight are the same.

Question 11

You push on box G that is next to box H,causing both boxes to slide along the floor,as shown in the figure.The Newton's third law pair to your push is

Accepted Answer

A) the push of box G on box H. 
B) the push of box H on box G. 
C) the push of box G against you. 
D) the upward force of the floor n box G. 
E) the acceleration of box G. 
A) the push of box G on box H. 
B) the push of box H on box G. 
C) the push of box G against you. 
D) the upward force of the floor n box G. 
E) the acceleration of box G.

Question 12

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

Question 13

The figure shows a graph of acceleration-versus-sum of the forces exerted on an object What is the mass of this object?

Accepted Answer

A) 2.5 g 
B) 1.6 g 
C) 630 g 
D) 400,000 g 
A) 2.5 g 
B) 1.6 g 
C) 630 g 
D) 400,000 g

Question 14

If you pound a feather with a hammer,on which one is a greater force exerted?

Accepted Answer

A) always the feather 
B) always the hammer 
C) The magnitude of the force is always exactly the same on both of them. 
D) If the feather moves, then the greater force was exerted on it. Otherwise forces of the same magnitude were exerted on both. 
A) always the feather 
B) always the hammer 
C) The magnitude of the force is always exactly the same on both of them. 
D) If the feather moves, then the greater force was exerted on it. Otherwise forces of the same magnitude were exerted on both.

Question 15

A satellite is in orbit around the earth.On which one is the greater force exerted?

Accepted Answer

A) on the satellite because the earth is so much more massive 
B) on the earth because the satellite has so little mass 
C) Exactly the same magnitude of force is exerted on both Earth and the satellite. 
D) It depends on the distance of the satellite from Earth. 
A) on the satellite because the earth is so much more massive 
B) on the earth because the satellite has so little mass 
C) Exactly the same magnitude of force is exerted on both Earth and the satellite. 
D) It depends on the distance of the satellite from Earth.

Question 16

A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s2 by means of a rope.
(a)What is the magnitude of the force exerted by the rope on the crate?
(b)What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s2?

Accepted Answer

Question 17

Bill and his daughter Susan are both standing on identical skateboards (with really good frictionless ball bearings),initially at rest.Bill weighs three times as much as Susan.Bill pushes horizontally on Susan's back,causing Susan to start moving away from Bill.Just after Bill stops pushing,

Accepted Answer

A) Susan and Bill are moving away from each other, and Susan's speed is three times that of Bill. 
B) Susan is moving away from Bill, and Bill is stationary. 
C) Susan and Bill are moving away from each other, with equal speeds. 
D) Susan and Bill are moving away from each other, and Susan's speed is one-third that of Bill. 
A) Susan and Bill are moving away from each other, and Susan's speed is three times that of Bill. 
B) Susan is moving away from Bill, and Bill is stationary. 
C) Susan and Bill are moving away from each other, with equal speeds. 
D) Susan and Bill are moving away from each other, and Susan's speed is one-third that of Bill.

Question 18

In order to lift a bucket of concrete,you must pull up harder on the bucket than the bucket pulls down on you.

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 exert a horizontal force $\overrightarrow { \mathrm { F } }$ 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

Accepted Answer

A) zero newtons in either case. 
B) larger if $\overrightarrow { \mathrm { F } }$ is applied toward the right. 
C) larger if $\overrightarrow { \mathrm { F } }$ is applied toward the left. 
D) the same in either case. 
A) zero newtons in either case. 
B) larger if $\overrightarrow { \mathrm { F } }$ is applied toward the right. 
C) larger if $\overrightarrow { \mathrm { F } }$ is applied toward the left. 
D) the same in either case.

Question 20

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 N 
A) 0.00 N 
B) 2.0 N 
C) 5.0 N 
D) 10 N 
E) 49 N

Exam 3: Newtonian Mechanics

An object of mass m rests on a flat table.The earth pulls on this object,exerting a force of magnitude mg.What is the Newton's third law pair force to this pull?

A flatbed truck is carrying an 800-kg load of timber that is not tied down.The maximum friction force that the truck bed exerts on the load is 2400 N.What is the greatest acceleration that the truck can have without losing its load?

In a certain particle accelerator,a proton reaches an acceleration of 9.0 × 1013 m/s2.The mass of a proton is 1.67 × 10-27 kg.What is the sum of the forces exerted on the proton?

If the sum of the forces exerted on a 4.5-kg tool accelerates it at 40 m/s2,what acceleration would that same sum of the forces give to an 18-kg tool?

A 20-ton truck collides with a 1500-lb car.Which of the following statements must be true?

A person who normally weighs 700 N is riding in a rather swift elevator that is moving at a constant speed of 9.8 m/s.If this person is standing on a bathroom scale inside the elevator,what would the scale read?

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

A horse pulls a cart with force F→\overrightarrow { \mathrm { 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

The acceleration of objects due to the gravitational force exerted on them is lower on the Moon than on Earth.Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface,compared to Earth?

You push on box G that is next to box H,causing both boxes to slide along the floor,as shown in the figure.The Newton's third law pair to your push is

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

The figure shows a graph of acceleration-versus-sum of the forces exerted on an object What is the mass of this object?

If you pound a feather with a hammer,on which one is a greater force exerted?

A satellite is in orbit around the earth.On which one is the greater force exerted?

A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s2 by means of a rope. (a)What is the magnitude of the force exerted by the rope on the crate? (b)What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s2?

Bill and his daughter Susan are both standing on identical skateboards (with really good frictionless ball bearings),initially at rest.Bill weighs three times as much as Susan.Bill pushes horizontally on Susan's back,causing Susan to start moving away from Bill.Just after Bill stops pushing,

In order to lift a bucket of concrete,you must pull up harder on the bucket than the bucket pulls down on you.

The figure shows two boxes,with m1 > m2,that are on a level frictionless surface.We can exert a horizontal force F→\overrightarrow { \mathrm { 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

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?

Introduction

Kinematics: Motion in One Dimension

Applying Newtons Laws

Circular Motion

Impulse and Linear Momentum

Work and Energy

Extended Bodies at Rest

Rotational Motion

Gases

Static Fluids

Fluids in Motion

First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge force and Energy

The Electric Field

Dc Circuits

Magnetism

Electromagnetic Induction

Vibrational Motion

Mechanical Waves

Reflection and Refraction

Mirrors and Lenses

Wave Optics

Electromagnetic Waves

Special Relativity

Quantum Optics

Atomic Physics

Nuclear Physics

Particle Physics

Filters

In a certain particle accelerator,a proton reaches an acceleration of 9.0 × 10¹³ m/s².The mass of a proton is 1.67 × 10^-27 kg.What is the sum of the forces exerted on the proton?

If the sum of the forces exerted on a 4.5-kg tool accelerates it at 40 m/s²,what acceleration would that same sum of the forces give to an 18-kg tool?

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

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

A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s² by means of a rope. (a)What is the magnitude of the force exerted by the rope on the crate? (b)What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s²?