Question 1

An object is moving with constant non-zero velocity.Which of the following statements about it must be true?

Accepted Answer

A) A constant force is being exerted on it in the direction of motion. 
B) A constant force is being exerted on it in the direction opposite of motion. 
C) A constant force is being exerted on it perpendicular to the direction of motion. 
D) The sum of the forces exerted on the object is zero. 
E) Its acceleration is in the same direction as it velocity. 
A) A constant force is being exerted on it in the direction of motion. 
B) A constant force is being exerted on it in the direction opposite of motion. 
C) A constant force is being exerted on it perpendicular to the direction of motion. 
D) The sum of the forces exerted on the object is zero. 
E) Its acceleration is in the same direction as it velocity. D

Question 2

A bucket is being lowered by a very light rope with a constant downward velocity. The force that the rope exerts on the bucket must be

Accepted Answer

A) equal to the force that Earth exerts on the bucket. 
B) greater than the force that Earth exerts on the bucket. 
C) less than the force that Earth exerts on the bucket. 
A) equal to the force that Earth exerts on the bucket. 
B) greater than the force that Earth exerts on the bucket. 
C) less than the force that Earth exerts on the bucket. A

Question 3

An object has a mass of 60 kg on Earth.What are the mass and weight of this object on the surface of the Moon where the acceleration of objects due to the gravitational attraction is only 1/6 of what it is on Earth?

Accepted Answer

mass = 60 kg,weight = 98 N

Question 4

A 45.0-kg person steps on a scale in an elevator.The scale reads 460 N.What is the magnitude of the acceleration of the elevator?

Accepted Answer

A) 4.91 m/s2 
B) 9.81 m/s2 
C) 46.9 m/s2 
D) 0.206 m/s2 
E) 0.422 m/s2 
A) 4.91 m/s2 
B) 9.81 m/s2 
C) 46.9 m/s2 
D) 0.206 m/s2 
E) 0.422 m/s2

Question 5

On its own,a tow truck has a maximum acceleration of 3.0 m/s2.What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?

Accepted Answer

A) 2.5 m/s2 
B) 2.0 m/s2 
C) 1.5 m/s2 
D) 1.0 m/s2 
A) 2.5 m/s2 
B) 2.0 m/s2 
C) 1.5 m/s2 
D) 1.0 m/s2

Question 6

A fireman is sliding down a fire pole.As he speeds up,he tightens his grip on the pole,thus increasing the vertical frictional force that the pole exerts on the fireman.When the force exerted on his hands equals the force that Earth exerts on him,what happens to the fireman?

Accepted Answer

A) The fireman comes to a stop. 
B) The fireman descends with slower and slower speed. 
C) The fireman descends with a smaller but non-zero acceleration. 
D) The fireman continues to descend, but with constant speed. 
E) The acceleration of the fireman is now upward. 
A) The fireman comes to a stop. 
B) The fireman descends with slower and slower speed. 
C) The fireman descends with a smaller but non-zero acceleration. 
D) The fireman continues to descend, but with constant speed. 
E) The acceleration of the fireman is now upward.

Question 7

A box is placed on a table which rests on the floor.The box pushes on the table; the Newton's third law pair to the the box's push on the table is the table's push on the floor.

Accepted Answer

A) True 
 B)False

Question 8

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. 
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.

Question 9

A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s.What is the magnitude of the net force exerted on a 68.0 kg passenger during the acceleration?

Accepted Answer

A) 394 N 
B) 82.0 N 
C) 342 N 
D) 311 N 
A) 394 N 
B) 82.0 N 
C) 342 N 
D) 311 N

Question 10

What is the mass of an object on which Earth exerts a gravitational force of 685 N near Earth's surface where g = 9.80 m/s2?

Accepted Answer

A) 69.9 kg 
B) 68.5 kg 
C) 71.3 kg 
D) 72.7 kg 
A) 69.9 kg 
B) 68.5 kg 
C) 71.3 kg 
D) 72.7 kg

Question 11

If the rockets of a spaceship in outer space (far from all gravity)suddenly lose power and go off,the spaceship will gradually slow to a stop.

Accepted Answer

A) True 
 B)False

Question 12

A block is on a frictionless table,on earth.The block accelerates at 5.3 m/ $\mathrm { s }^2$ when a $10 \mathrm {~N}$ 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/ $\mathrm { s }^2$ A horizontal force of 5 N is now exerted on the block when it is on the Moon.The acceleration of the block due to this force is closest to

Accepted Answer

A) 2.7 m/ $\mathrm { s }^2$ 
B) 2.4 m/ $\mathrm { s }^2$ 
C) 2.9 m/ $\mathrm { s }^2$ 
D) 3.2 m/ $\mathrm { s }^2$ 
E) 3.4 m/ $\mathrm { s }^2$ 
A) 2.7 m/ $\mathrm { s }^2$ 
B) 2.4 m/ $\mathrm { s }^2$ 
C) 2.9 m/ $\mathrm { s }^2$ 
D) 3.2 m/ $\mathrm { s }^2$ 
E) 3.4 m/ $\mathrm { s }^2$

Question 13

A 10-kg object is hanging by a very light wire in an elevator that is traveling upward.The force that the wire exerts on the object is measured to be 75 N.What are the magnitude and direction of the acceleration of the elevator?

Accepted Answer

The answer of A 10-kg object is hanging by a...

Question 14

The sum of the forces exerted on an object of interest is 125 N.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. 
A) 3000 kg. 
B) 2880 kg. 
C) 144 kg. 
D) 0.200 kg. 
E) 5.21 kg.

Question 15

You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train.From this observation,you can conclude that this train is

Accepted Answer

A) speeding up. 
B) slowing down. 
C) changing direction. 
D) speeding up and changing direction. 
E) slowing down and changing direction. 
A) speeding up. 
B) slowing down. 
C) changing direction. 
D) speeding up and changing direction. 
E) slowing down and changing direction.

Question 16

If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet,what is the acceleration of objects due to the gravitational attraction on that planet?

Accepted Answer

A) 70.4 m/s2 
B) 51.4 m/s2 
C) 61.2 m/s2 
D) 81.0 m/s2 
A) 70.4 m/s2 
B) 51.4 m/s2 
C) 61.2 m/s2 
D) 81.0 m/s2

Question 17

The figure shows a graph of acceleration-versus-sum of the forces exerted on the objects for three objects pulled by wires.If the mass of object 2 is 36 kg,what are the masses of objects 1 and 3?

Accepted Answer

A) 12 kg and 90 kg 
B) 72 kg and 18 kg 
C) 90 kg and 12 kg 
D) 12 kg and 72 kg 
A) 12 kg and 90 kg 
B) 72 kg and 18 kg 
C) 90 kg and 12 kg 
D) 12 kg and 72 kg

Question 18

An astronaut weighs 99 N on the Moon,where the acceleration of objects due to the gravitational attraction is 1.62 m/s2.How much does she weigh on Earth?

Accepted Answer

A) 16 N 
B) 61 N 
C) 99 N 
D) 600 N 
E) 440 N 
A) 16 N 
B) 61 N 
C) 99 N 
D) 600 N 
E) 440 N

Question 19

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s.The vector sum of all the forces exerted on this crate must point

Accepted Answer

A) down the ramp. 
B) up the ramp. 
C) perpendicular to the ramp. 
D) vertically downward. 
E) None of the above choices is correct. 
A) down the ramp. 
B) up the ramp. 
C) perpendicular to the ramp. 
D) vertically downward. 
E) None of the above choices is correct.

Question 20

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

Exam 3: Newtonian Mechanics

An object is moving with constant non-zero velocity.Which of the following statements about it must be true?

A bucket is being lowered by a very light rope with a constant downward velocity. The force that the rope exerts on the bucket must be

An object has a mass of 60 kg on Earth.What are the mass and weight of this object on the surface of the Moon where the acceleration of objects due to the gravitational attraction is only 1/6 of what it is on Earth?

A 45.0-kg person steps on a scale in an elevator.The scale reads 460 N.What is the magnitude of the acceleration of the elevator?

On its own,a tow truck has a maximum acceleration of 3.0 m/s2.What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?

A fireman is sliding down a fire pole.As he speeds up,he tightens his grip on the pole,thus increasing the vertical frictional force that the pole exerts on the fireman.When the force exerted on his hands equals the force that Earth exerts on him,what happens to the fireman?

A box is placed on a table which rests on the floor.The box pushes on the table; the Newton's third law pair to the the box's push on the table is the table's push on the floor.

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?

A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s.What is the magnitude of the net force exerted on a 68.0 kg passenger during the acceleration?

What is the mass of an object on which Earth exerts a gravitational force of 685 N near Earth's surface where g = 9.80 m/s2?

If the rockets of a spaceship in outer space (far from all gravity)suddenly lose power and go off,the spaceship will gradually slow to a stop.

A 10-kg object is hanging by a very light wire in an elevator that is traveling upward.The force that the wire exerts on the object is measured to be 75 N.What are the magnitude and direction of the acceleration of the elevator?

The sum of the forces exerted on an object of interest is 125 N.As a result,the object accelerates with an acceleration of 24.0 m/s2.The mass of the object is

You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train.From this observation,you can conclude that this train is

If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet,what is the acceleration of objects due to the gravitational attraction on that planet?

The figure shows a graph of acceleration-versus-sum of the forces exerted on the objects for three objects pulled by wires.If the mass of object 2 is 36 kg,what are the masses of objects 1 and 3?

An astronaut weighs 99 N on the Moon,where the acceleration of objects due to the gravitational attraction is 1.62 m/s2.How much does she weigh on Earth?

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s.The vector sum of all the forces exerted on this crate must point

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

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

On its own,a tow truck has a maximum acceleration of 3.0 m/s².What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?

What is the mass of an object on which Earth exerts a gravitational force of 685 N near Earth's surface where g = 9.80 m/s²?

The sum of the forces exerted on an object of interest is 125 N.As a result,the object accelerates with an acceleration of 24.0 m/s².The mass of the object is

If I weigh 741 N on Earth at a place where g = 9.80 m/s² and 5320 N on the surface of another planet,what is the acceleration of objects due to the gravitational attraction on that planet?

An astronaut weighs 99 N on the Moon,where the acceleration of objects due to the gravitational attraction is 1.62 m/s².How much does she weigh on Earth?