Question 1

The figure shows an object's acceleration-versus-force graph.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 2

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 3

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 4

A block is on a frictionless table,on earth.The block accelerates at 3.0 m/  
When a   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/   .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 5

A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s.What magnitude force does a 68.0 kg passenger experience 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 6

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 7

When a 45-kg person steps on a scale in an elevator,the scale reads a steady 410 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. 
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.

Question 8

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. 
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.

Question 9

Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling.The wire makes an angle θ with the ceiling,as shown in the figure.Which one of the following conditions must be true about the tension T in the wire?

Accepted Answer

A) T sin θ = W 
B) T cos θ = W 
C) T tan θ = W 
D) T = W 
E) T = ma 
A) T sin θ = W 
B) T cos θ = W 
C) T tan θ = W 
D) T = W 
E) T = ma

Question 10

What magnitude net force is required to accelerate a 1200-kg car uniformly from 0 m/s to 27.0 m/s in  
?

Accepted Answer

A) 444 N 
B) 1620 N 
C) 3240 N 
D) 4360 N 
E) 11800 N 
A) 444 N 
B) 1620 N 
C) 3240 N 
D) 4360 N 
E) 11800 N

Question 11

An object of mass m rests on a flat table.The earth pulls on this object with a force of magnitude mg.What is the reaction force to this pull?

Accepted Answer

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

Question 12

A satellite is in orbit around the earth.Which one feels the greater force?

Accepted Answer

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

Question 13

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 14

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. 
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.

Question 15

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 on his hands equals his weight,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 16

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 17

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 18

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

Question 19

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 20

The figure shows an acceleration-versus-force graph 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

Exam 5: Newtons Laws of Motion

The figure shows an object's acceleration-versus-force graph.What is the mass of this object?

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 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.

A block is on a frictionless table,on earth.The block accelerates at 3.0 m/ When a 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/ .The weight of the block on the Moon is closest to

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

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

When a 45-kg person steps on a scale in an elevator,the scale reads a steady 410 N.Which of the following statements must be true? (There could be more than one correct choice. )

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

Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling.The wire makes an angle θ with the ceiling,as shown in the figure.Which one of the following conditions must be true about the tension T in the wire?

What magnitude net force is required to accelerate a 1200-kg car uniformly from 0 m/s to 27.0 m/s in ?

An object of mass m rests on a flat table.The earth pulls on this object with a force of magnitude mg.What is the reaction force to this pull?

A satellite is in orbit around the earth.Which one feels the greater force?

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?

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. )

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 on his hands equals his weight,what happens to the fireman?

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

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.

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?

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,

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

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Fluids

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics and Nuclear Radiation

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?

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?