Question 1

Suppose you are driving your car down the highway and speeding up. Which of the following are true?

Accepted Answer

A)  The car's momentum is constant but not its kinetic energy. 
B)  The car's kinetic energy is constant but not its momentum. 
C)  Both the car's kinetic energy and momentum are constant. 
D)  Neither the car's kinetic energy nor momentum are constant. 
A)  The car's momentum is constant but not its kinetic energy. 
B)  The car's kinetic energy is constant but not its momentum. 
C)  Both the car's kinetic energy and momentum are constant. 
D)  Neither the car's kinetic energy nor momentum are constant. D

Question 2

Some climatologists say that our climate could be warm enough to melt the polar ice caps, sending the resulting water down towards the equator. If this were to happen, the length of the day would

Accepted Answer

A)  Increase due to friction. 
B)  Increase due to angular momentum conservation. 
C)  Decrease due to mass loss. 
D)  Decrease due to work done by the ice. 
A)  Increase due to friction. 
B)  Increase due to angular momentum conservation. 
C)  Decrease due to mass loss. 
D)  Decrease due to work done by the ice. B

Question 3

Consider a sailboat with the wind gently blowing the sail on a beautiful, calm day, so the boat is propelled through the water at a constant velocity.
-What can be said about any forces acting on the boat other than that from the wind on the sail? That is, must other forces be present?

Accepted Answer

The wind on the sail clearly exerts a force on the boat. Since there is no net force on the boat, however, there must be at least one other force acting on the boat to cancel that from the wind. A major contributor to this force could be drag resistance when moving through the water.

Question 4

Suppose you are a police investigator and are investigating two car accidents. Before you even go to either accident scene, you know (interestingly) that both accidents were identical head - on collisions with identical cars moving at identical speeds, but in one case the cars locked bumpers while in the other case they bounced off each other elastically. From a physics point of view, which accident is more dangerous?

Accepted Answer

The accident involving locking bumpers i

Question 5

Suppose you are driving your car down the highway at constant velocity. Which of the following are true?

Accepted Answer

A)  The car's momentum is constant but not its kinetic energy. 
B)  The car's kinetic energy is constant but not its momentum. 
C)  Both the car's kinetic energy and momentum are constant. 
D)  Neither the car's kinetic energy nor momentum are constant. 
A)  The car's momentum is constant but not its kinetic energy. 
B)  The car's kinetic energy is constant but not its momentum. 
C)  Both the car's kinetic energy and momentum are constant. 
D)  Neither the car's kinetic energy nor momentum are constant.

Question 6

Consider a 100 kg Father and his 20 kg girl. They decide to enjoy balancing on a seesaw, which is a uniform board 4 m long and pivoted exactly at its center. If girl sits at the seesaw's end (2m from the center), how far from the center on the other side should the father sit?

Accepted Answer

A)  Farther out than the board will allow. 
B)  0.5 m 
C)  0.4 m 
D)  1.5 m 
A)  Farther out than the board will allow. 
B)  0.5 m 
C)  0.4 m 
D)  1.5 m

Question 7

Suppose the earth's polar ice caps melted, sending water towards the equator and increasing the moment of inertia of the earth to 1.1 times its present value. The angular velocity of the earth will be

Accepted Answer

A)  0.82 times its present value 
B)  unchanged 
C)  0.909 times its present value 
D)  1.1 times its present value. 
A)  0.82 times its present value 
B)  unchanged 
C)  0.909 times its present value 
D)  1.1 times its present value.

Question 8

Consider a bowling ball sliding down the lane just after you have thrown it. As you know, when the ball is sliding, friction is creating a torque on the ball. Identify four things you could alter so as to cause the ball to experience a larger torque.

Accepted Answer

I could make the ball heavier. This incr

Question 9

When sliding a heavy box across the floor, it is often times helpful to lift up on it slightly because

Accepted Answer

A)  You are lessening the friction force by reducing the contact force between the box and the floor 
B)  You are reducing the weight of the box. 
C)  You are working against friction by lifting up. 
D)  You are working against gravity, even if the box does not move upwards. 
A)  You are lessening the friction force by reducing the contact force between the box and the floor 
B)  You are reducing the weight of the box. 
C)  You are working against friction by lifting up. 
D)  You are working against gravity, even if the box does not move upwards.

Question 10

You are staring at a non-rotating wind turbine and all of a sudden the wind comes up and makes the turbine start rotating clockwise. The net force that causes translational motion is ______ and the torque causing the turbine to rotate is ________.

Accepted Answer

A)  positive; towards you. 
B)  negative; towards you. 
C)  zero; to the left. 
D)  zero; away from you. 
A)  positive; towards you. 
B)  negative; towards you. 
C)  zero; to the left. 
D)  zero; away from you.

Question 11

Suppose you are driving your car down the highway and rounding a curve at constant speed. Which of the following are true?

Accepted Answer

A)  The car's momentum is constant but not its kinetic energy. 
B)  The car's kinetic energy is constant but not its momentum. 
C)  Both the car's kinetic energy and momentum are constant. 
D)  Neither the car's kinetic energy nor momentum are constant. 
A)  The car's momentum is constant but not its kinetic energy. 
B)  The car's kinetic energy is constant but not its momentum. 
C)  Both the car's kinetic energy and momentum are constant. 
D)  Neither the car's kinetic energy nor momentum are constant.

Question 12

Please discuss the three conserved quantities in this chapter, the conditions under which they are conserved and real-life examples of their transfer mechanisms.

Accepted Answer

Energy (Conserved in non - dissipative s

Question 13

Suppose you double the length of the blades of a wind turbine. For the same wind conditions, the torque on the turbine

Accepted Answer

A)  Stays the same 
B)  Doubles 
C)  Quadruples 
D)  Halves 
A)  Stays the same 
B)  Doubles 
C)  Quadruples 
D)  Halves

Question 14

What type of friction could cause a damaged to waste energy?

Accepted Answer

A)  Sliding 
B)  Static 
C)  Both 
D)  Neither 
A)  Sliding 
B)  Static 
C)  Both 
D)  Neither

Question 15

Suppose the moon's angular velocity is halved. By what factor will its rotational kinetic energy change?

Accepted Answer

A)  It will double. 
B)  It will quadruple. 
C)  It will decrease to ¼ its original value. 
D)  It will decrease to ½ its original value. 
A)  It will double. 
B)  It will quadruple. 
C)  It will decrease to ¼ its original value. 
D)  It will decrease to ½ its original value.

Question 16

When chewing hard nuts, we use the teeth towards the back of our mouth because we are able to exert a greater _____________ on the nuts.

Accepted Answer

A)  force 
B)  torque 
C)  angular velocity 
D)  lever arm 
A)  force 
B)  torque 
C)  angular velocity 
D)  lever arm

Question 17

It is possible for two objects of equal mass to have rotational masses because

Accepted Answer

A)  Rotational mass depends on total mass and mass distribution. 
B)  The objects may be made out of different materials. 
C)  Rotational mass is always half the total mass. 
D)  An object not rotating has no rotational mass. 
A)  Rotational mass depends on total mass and mass distribution. 
B)  The objects may be made out of different materials. 
C)  Rotational mass is always half the total mass. 
D)  An object not rotating has no rotational mass.

Question 18

When building soap box cars which race by coasting downhill it is better to have solid wheels rather than ones of equal mass with spokes because

Accepted Answer

A)  The solid wheels have a lower moment of inertia and therefore accelerate faster. 
B)  The solid wheels are easier to paint. 
C)  The solid wheels have a higher moment of inertia and therefore retain more rotational energy. 
D)  The wheels with spokes lose too much energy by heating up the air. 
A)  The solid wheels have a lower moment of inertia and therefore accelerate faster. 
B)  The solid wheels are easier to paint. 
C)  The solid wheels have a higher moment of inertia and therefore retain more rotational energy. 
D)  The wheels with spokes lose too much energy by heating up the air.

Question 19

Consider the earth spinning from west to east on its axis. It is slowing down in its rotation due to friction with the air. Using the right hand rule, in what direction is the frictional torque?

Accepted Answer

A)  S pole to N pole 
B)  N pole to S pole 
C)  Counterclockwise along the equator
D Clockwise along the equator 
A)  S pole to N pole 
B)  N pole to S pole 
C)  Counterclockwise along the equator
D Clockwise along the equator

Question 20

If you need to harness energy in order to do a particular job, the type of energy needed is

Accepted Answer

A)  ordered energy. 
B)  thermal energy. 
C)  energy dissipated by friction 
D)  gravitational power 
A)  ordered energy. 
B)  thermal energy. 
C)  energy dissipated by friction 
D)  gravitational power

Suppose you are driving your car down the highway and speeding up. Which of the following are true?

Some climatologists say that our climate could be warm enough to melt the polar ice caps, sending the resulting water down towards the equator. If this were to happen, the length of the day would

Consider a sailboat with the wind gently blowing the sail on a beautiful, calm day, so the boat is propelled through the water at a constant velocity. -What can be said about any forces acting on the boat other than that from the wind on the sail? That is, must other forces be present?

Suppose you are driving your car down the highway at constant velocity. Which of the following are true?

Consider a 100 kg Father and his 20 kg girl. They decide to enjoy balancing on a seesaw, which is a uniform board 4 m long and pivoted exactly at its center. If girl sits at the seesaw's end (2m from the center), how far from the center on the other side should the father sit?

Suppose the earth's polar ice caps melted, sending water towards the equator and increasing the moment of inertia of the earth to 1.1 times its present value. The angular velocity of the earth will be

Consider a bowling ball sliding down the lane just after you have thrown it. As you know, when the ball is sliding, friction is creating a torque on the ball. Identify four things you could alter so as to cause the ball to experience a larger torque.

When sliding a heavy box across the floor, it is often times helpful to lift up on it slightly because

You are staring at a non-rotating wind turbine and all of a sudden the wind comes up and makes the turbine start rotating clockwise. The net force that causes translational motion is and the torque causing the turbine to rotate is __.

Suppose you are driving your car down the highway and rounding a curve at constant speed. Which of the following are true?

Please discuss the three conserved quantities in this chapter, the conditions under which they are conserved and real-life examples of their transfer mechanisms.

Suppose you double the length of the blades of a wind turbine. For the same wind conditions, the torque on the turbine

What type of friction could cause a damaged to waste energy?

Suppose the moon's angular velocity is halved. By what factor will its rotational kinetic energy change?

When chewing hard nuts, we use the teeth towards the back of our mouth because we are able to exert a greater _____________ on the nuts.

It is possible for two objects of equal mass to have rotational masses because

When building soap box cars which race by coasting downhill it is better to have solid wheels rather than ones of equal mass with spokes because

Consider the earth spinning from west to east on its axis. It is slowing down in its rotation due to friction with the air. Using the right hand rule, in what direction is the frictional torque?

If you need to harness energy in order to do a particular job, the type of energy needed is

The Laws of Motion, Part 1

Mechanical Objects, Part 1

Mechanical Objects, Part 2

Fluids

Fluids and Motion

Heat and Phase Transitions

Thermodynamics

Resonance and Mechanical Waves

Electricity

Magnetism and Electrodynamics

Electromagnetic Waves

Light

Optics and Electronics

Modern Physics

Filters

Exam 2: The Laws of Motion, Part 2

Suppose you are driving your car down the highway and speeding up. Which of the following are true?

Some climatologists say that our climate could be warm enough to melt the polar ice caps, sending the resulting water down towards the equator. If this were to happen, the length of the day would

Consider a sailboat with the wind gently blowing the sail on a beautiful, calm day, so the boat is propelled through the water at a constant velocity. -What can be said about any forces acting on the boat other than that from the wind on the sail? That is, must other forces be present?

Suppose you are driving your car down the highway at constant velocity. Which of the following are true?

Consider a 100 kg Father and his 20 kg girl. They decide to enjoy balancing on a seesaw, which is a uniform board 4 m long and pivoted exactly at its center. If girl sits at the seesaw's end (2m from the center), how far from the center on the other side should the father sit?

Suppose the earth's polar ice caps melted, sending water towards the equator and increasing the moment of inertia of the earth to 1.1 times its present value. The angular velocity of the earth will be

Consider a bowling ball sliding down the lane just after you have thrown it. As you know, when the ball is sliding, friction is creating a torque on the ball. Identify four things you could alter so as to cause the ball to experience a larger torque.

When sliding a heavy box across the floor, it is often times helpful to lift up on it slightly because

You are staring at a non-rotating wind turbine and all of a sudden the wind comes up and makes the turbine start rotating clockwise. The net force that causes translational motion is ______ and the torque causing the turbine to rotate is ________.

Suppose you are driving your car down the highway and rounding a curve at constant speed. Which of the following are true?

Please discuss the three conserved quantities in this chapter, the conditions under which they are conserved and real-life examples of their transfer mechanisms.

Suppose you double the length of the blades of a wind turbine. For the same wind conditions, the torque on the turbine

What type of friction could cause a damaged to waste energy?

Suppose the moon's angular velocity is halved. By what factor will its rotational kinetic energy change?

When chewing hard nuts, we use the teeth towards the back of our mouth because we are able to exert a greater _____________ on the nuts.

It is possible for two objects of equal mass to have rotational masses because

When building soap box cars which race by coasting downhill it is better to have solid wheels rather than ones of equal mass with spokes because

Consider the earth spinning from west to east on its axis. It is slowing down in its rotation due to friction with the air. Using the right hand rule, in what direction is the frictional torque?

If you need to harness energy in order to do a particular job, the type of energy needed is

The Laws of Motion, Part 1

Mechanical Objects, Part 1

Mechanical Objects, Part 2

Fluids

Fluids and Motion

Heat and Phase Transitions

Thermodynamics

Resonance and Mechanical Waves

Electricity

Magnetism and Electrodynamics

Electromagnetic Waves

Light

Optics and Electronics

Modern Physics

Filters

You are staring at a non-rotating wind turbine and all of a sudden the wind comes up and makes the turbine start rotating clockwise. The net force that causes translational motion is and the torque causing the turbine to rotate is __.