PH 111 - Final Exam

Waldron Spring 2025

Negative

Consider the vector C = A + B. The x component of C is …

Positive

Negative

Zero

Negative

Consider the vector C = A + B. The y component of C is …

Positive

Negative

Zero

Negative

Consider the vector C = A - B. The x component of C is …

Positive

Negative

Zero

Positive

Consider the vector C = A - B. The y component of C is …

Positive

Negative

Zero

When the magnitude of k is less than 1

Vector B=kA where k is a scalar. When does B have a smaller magnitude than A?

When the magnitude of k is less than 1

When the magnitude of k is equal to 1

When the magnitude of k is greater than 1

False

True or False: When vectors are added together, the order of addition matters

Zero

A football player receives a kickoff at the front of his end zone. He runs to the 50 yd line and is chased back to his starting position where he is tackled. What is his total displacement along the length of the field?

(Assume he begins on the left end of the field, and the right is positive. Also, assume that he only runs along the long axis of the field.)

Greater than zero

Less than zero

Zero

Cannot be determined

Greater than zero

A football player receives a kickoff at the front of his end zone. He runs to the 50 yd line and is chased back into his end zone where he is tackled. What distance is he from his original starting position?

(Assume he begins on the left end of the field, and the right is positive. Also, assume that he only runs along the long axis of the field.)

Greater than zero

Less than zero

Zero

Cannot be determined

100 yards

A football player receives a kickoff at the front of his end zone. He runs to the 50 yd line and is chased back to his starting position where he is tackled. What is his total path length that he runs?

(Assume he begins on the left end of the field, and the right is positive. Also, assume that he only runs along the long axis of the field.)

0 yards

50 yards

100 yards

Cannot be determined

Zero

A football player receives a kickoff at the front of his end zone. He runs to the 50 yd line and is chased back to his starting position where he is tackled. What is his average velocity along the length of the field?

(Assume he begins on the left end of the field, and the right is positive. Also assume that he only runs along the long axis of the field.)

Greater than zero

Less than zero

Zero

Cannot be determined

False

True or False: Acceleration and velocity must always be in the same direction

True

True or False: In one dimension, it is possible for an object to be slowing and its acceleration be positive.

Car B & Car C

Which of the cars is slowing down?

State all that apply

Car A

Car B

Car C

Car D

Car B & Car D

Which of the cars has negative acceleration?

State all that apply

Car A

Car B

Car C

Car D

An object has constant acceleration & An object is not accelerating

The kinematic equations derived at the beginning of the semester apply when:

An object is accelerating

An object has constant acceleration

An object is not accelerating

Never

Remains constant

When an object is tossed in the air, the object’s acceleration _____ while it is in free fall.

Increases

Decreases

Increases then decreases

Decreases then increases

Remains constant

Decreases then increases

When an object is tossed in the air, the object’s speed _____ while it is in free fall.

Increases

Decreases

Increases then decreases

Decreases then increases

Remains constant

Increases

An object is dropped into free fall. Five seconds later a second object is dropped into free fall. While they are falling, the distance between them:

Increases

Decreases

Remains constant

The object has constant velocity

The acceleration of an object is zero when:

The object moves at constant speed

The object moves in a straight line

The object has constant velocity

None of these

North, South, East, & West

If an object is moving toward the west at some instant, in what direction could its acceleration be?

State all that may apply

North

South

East

West

Driving up a long straight incline at a constant speed

The acceleration of a car is zero when it is:

Turning right at a constant speed

Driving up a long straight incline at a constant speed

Traveling over the crest of a hill at a constant speed

Bottoming out at the lowest point of a valley at a constant speed

Speeding up as it descends a long straight decline

True

True or False: Imagine objects A and B are moving in the same direction at the same speed. The relative velocity between these two objects is zero.

Nowhere along the path

As a projectile moves in its parabolic path with non-zero velocity in the x direction, the velocity and acceleration are parallel when?

At the peak

Everywhere along the path

Nowhere along the path

Not enough information

False

True or False: If an object is moving, then there must be a force acting on that object.

Second

The statement, "an object experiencing a net force has an acceleration inversely proportional to its mass," align to which of Newton’s Laws?

First

Second

Third

Fourth

Third

The statement, “forces come in pairs,” aligns to which of Newton’s Laws?

First

Second

Third

Fourth

True

True or False: If a single force acts on an object, the object accelerates.

First

The statement, "objects tend to maintain their current state of motion," aligns to which of Newton’s Laws?

First

Second

Third

Fourth

The net force acting on the truck is zero

A truck moves directly away from you at a constant velocity (as observed by you while standing in the middle of the road). It follows that …

No forces act on the truck

A constant net force acts on the truck in the direction of its velocity

The net force acting on the truck is zero

The net force acting on the truck is equal to its weight

True

True or False: If two external forces that are both equal in magnitude and opposite in direction act on the same object, the two forces can never be a N3L pair.

False

True or False: Objects in orbit do NOT experience gravity from the body they orbit.

True

True or False: Objects in orbit DO experience gravity from the body they orbit.

False

True or False: Two forces of a N3L pair are equal only if the objects involved are not accelerating.

The person’s gravity pulling up on the Earth

What is the reaction force to the Earth’s gravity pulling down on a person according to N3L?

The upward force exerted by the ground on the person

The person’s gravity pulling up on the Earth

The Earth’s gravity pulling up on the person

The person pushing down on the ground

They have the same magnitude force

A motorcycle and a truck collide head on. Which experiences the greater magnitude force?

Motorcycle

Truck

They have the same magnitude force

Motorcycle

A motorcycle and a truck collide head on. Which experiences the greater magnitude acceleration?

Motorcycle

Truck

They have the same magnitude acceleration

Zero

What is the apparent weight of someone in free fall?

Less than their weight, but not zero

Equal to their weight

Greater than their weight

Zero

False

True or False: The normal force always points up.

True

True or False: The normal force always points perpendicular to the surface an object is in contact with.

False

True or False: The normal force is always equal and opposite to the force of gravity.

Out of the board

I press the board’s eraser into the vertical plane of the board such that it does not fall. In which direction is the normal force of the board?

Upward

Downward

To the left

To the right

Out of the board

Into the board

Upward

I press the board’s eraser into the vertical plane of the board such that it does not fall. In which direction is the static friction on the eraser?

Upward

Downward

To the left

To the right

Out of the board

Into the board

Pulling with a string forward and upward

You slide a friend on a cardboard sled down the dorm hallway. Which case would make your job easiest?

Pressing on the shoulders forward and down

Pressing on the back parallel with the floor

Pulling with a string forward and upward

The component of gravity down the ramp is equal to friction

Objects that slide down a ramp can do so with constant speed. In this case, we expect …

The component of gravity down the ramp is less than friction

The component of gravity down the ramp is equal to friction

The component of gravity down the ramp is greater than friction

True

True or False: A force that is always perpendicular to the velocity of a particle never does work on the particle.

Equal to zero

You hold your book bag in your hand and carry it along level ground. In this case the word you do on the bag is …

Greater than zero

Equal to zero

Less than zero

True

True or False: Work can be negative.

Postive

As a block slides down a ramp, gravity does ____ work.

Positive

Negative

Zero

Zero

As a block slides down a ramp, the normal force does ____ work.

Positive

Negative

Zero

Positive

A block slides down a ramp subject to gravity, the normal force of the plane, and friction. If the object speeds up, the net force does ___ work.

Positive

Negative

Zero

They all have the same speed when they strike the ground

Three objects are thrown with the same initial speed from the same rooftop. One thrown slightly upward, one horizontal, and one slightly downward.

Which one will have the highest speed when they hit the ground?

The one thrown slightly upward

The horizontally thrown object

The one thrown slightly downward

They all have the same speed when they strike the ground

4x

A spring is compressed some distance. By what factor does the stored energy change when the compression instance is doubled?

1x (its constant)

2x

4x

1/2x

1/4x

The object falls at constant speed

For an object that is falling, the drag force can eventually the gravitational force. In this case …

The object stops moving

The object moves upward

The object falls at constant speed

The object falls with speed g

True

True or False: If two people lift identical boxes to the same height but one does it faster, the person who lifts the box faster uses more power.

True (think boomerang)

True or False: The center of mass of an object can lie outside the object.

Both balls will have the same change in momentum

If a tennis ball and bowling ball experience the same impulse, which of the following is true?

Both balls will have the same change in momentum

The tennis ball will have a greater change in momentum

The bowling ball will experience a greater change in momentum

Neither ball will change its momentum

They have the same magnitude momentum change

A motorcycle and a truck collide head on. Which experiences a greater change in its momentum?

Motorcycle

Truck

They have the same magnitude momentum change

Motorcycle

A motorcycle and a truck collide head on. Which experiences a greater change in its velocity?

Motorcycle

Truck

They have the same magnitude velocity change

Perfectly inelastic collision

Objects that collide and stick together experience a(n) _____

Elastic collision

Inelastic collision

Perfectly elastic collision

Perfectly inelastic collision

Always

In a collision, momentum is ____ conserved.

Always

Sometimes (rarely)

Never

Sometimes (rarely)

In a collision, kinetic energy is ____ conserved.

Always

Sometimes (rarely)

Never

It remains stationary

Two ice skaters, one heaver than the other, push off from each other while standing still. What happens to the center of mass of the skater system?

It moves in the direction of the heavier skater

It moves in the direction of the lighter skater

It remains stationary

It moves halfway between the two skaters

Moves to the right

A toddler stands on a sled that is on ice on the driveway. The toddler walks to the left, therefore the sled ____.

Moves to the left

Moves to the right

Remains stationary

Their angular velocity is the same

Two students are on the same rotating merry-go-round. Student A is 1m from the center, and Student B is 2m from the center.

Which has the higher angular velocity?

Student A

Student B

Their angular velocity is the same

Cannot be determined

Student B

Two students are on the same rotating merry-go-round. Student A is 1m from the center, and Student B is 2m from the center.

Which has the higher tangential velocity?

Student A

Student B

Their angular velocity is the same

Cannot be determined

Student B

Two students are on the same rotating merry-go-round. Student A is 1m from the center, and Student B is 2m from the center.

Which has the higher centripetal acceleration?

Student A

Student B

Their angular velocity is the same

Cannot be determined

Increases linearly with angular speed

The motor of a merry-go-round exerts a constant torque on it. As it speeds up from rest, the power output of the motor:

Is constant

Increases linearly with angular speed

Is zero

None of these

False

True or False: A particle moving in uniform circular motion has constant velocity.

False

True or False: A particle moving in uniform circular motion has constant acceleration.

They are the same

As the ISS orbits the Earth, which experiences the greater gravitational force?

The Earth

The ISS

They are the same

Need to know their masses

They are the same

As the ISS orbits the Earth, which experiences the greater acceleration?

The Earth

The ISS

They are the same

Need to know their masses

Satellite 2

Satellite 1 is in a certain circular orbit while satellite 2 is in a larger circular orbit. Which has the longer period?

Satellite 1

Satellite 2