C165 Physics

Question 1

A car is moving forward and its brakes are being applied. Which of the following is true?

The car’s velocity is backward, and its acceleration is backward.

The car’s velocity is forward, and its acceleration is forward.

The car’s velocity is backward, and its acceleration is forward.

The car’s velocity is forward, and its acceleration is backward.

Answer 1

The car’s velocity is forward, and its acceleration is backward.

Question 2

The mass of an object measures

.

Answer 2

object’s resistance to being accelerated.

Question 3

A hockey player pushes a puck so that it slides along the ice. The puck eventually slows down because

Answer 3

he puck will eventually slow down because the ice is applying a force of friction in the opposite direction.

Question 4

The force that keeps an astronaut on the surface of the moon, instead of floating in space, is called

Answer 4

gravity

Question 5

A car decreases its speed from 40 miles per hour to 20 miles per hour. Its linear momentum

Answer 5

is half as much

Question 6

In physics, work is

Answer 6

energy transferred from one object to another by a force acting through a distance.

Question 7

Which of the following statements is correct?

Potential energy is the energy of mass and kinetic energy is the energy of gravity.

Kinetic energy is the energy an object has as a result of its motion, and potential energy is the energy an object has due to its position or deformation.

Potential energy is the energy of speed and kinetic energy is the energy stored in an object.

Answer 7

Kinetic energy is the energy an object has as a result of its motion, and potential energy is the energy an object has due to its position or deformation.

Question 8

A truck increases its speed. What happens to its kinetic energy?

it decreases

it increases

not enough information

Answer 8

it increases

Question 9

A train traveling 50 mph slows down and stops once the brakes are applied. The train’s kinetic energy

Answer 9

The train’s kinetic energy changes to the thermal energy of the brakes.

Question 10

When energy changes from one type to another, the total energy
.

The above statement is known as

Answer 10

The total energy remains the same.

This statement is known as the law of conservation of energy.

Question 11

A jet flying overhead produces sound waves that consist of ______ that is/are transported from the jet to your ears.

Answer 11

energy

Question 12

Which of the following lists of colors is ordered from lowest to highest frequencies?

red, yellow, green, blue

blue, green, yellow, red

blue, yellow, green, red

red, green, yellow, blue

Answer 12

red, yellow, green, blue

Question 13

If you hit a drum with more force, the sound the drum produces

Answer 13

becomes louder.

Question 14

A woman does pushups by lowering her body to the floor using her arms and then pressing against the floor with her hands to push herself back up, as shown in the image below.

The downward force of gravity that Earth exerts on the woman

The downward force that the woman’s arms exert on the ground

The upward force that the ground exerts on the woman

The upward force that the woman’s arms exert on the ground

Answer 14

The upward force that the ground exerts on the woman

Question 15

Two boxes sitting on the floor look identical, but one has more mass than the other.

What happens when the same net force, sufficient to overcome static friction, is applied to each box?

The box with less mass accelerates more.
The box with more mass accelerates more.
Both boxes accelerate at the same rate.
Both boxes remain at rest.

Answer 15

The box with less mass accelerates more.

Question 16

Two identical train engines are parked on parallel tracks. One engine has ten cars attached, and the other has no cars attached. Each engine exerts the same net force, which allows the train to overcome static friction.

Which engine will be able to accelerate more?

The engine not pulling any cars will accelerate more.
The engine pulling ten cars will accelerate more.
Both engines will accelerate at the same rate.
Both engines will remain at rest.

Answer 16

The engine not pulling any cars will accelerate more.

Question 17

A woman applies an upward force to a basket filled with groceries. Assume she is standing still.

What will happen to the basket if the force she applies is greater than the force of gravity?

The basket will move sideways.
The basket will remain at the same height.
The basket will move up.
The basket will move down.

Answer 17

The basket will move up.

Question 18

A heavy truck and a light car travel at the same velocity side-by-side on the highway. Both drivers apply the same braking force at the same moment.

What will happen to the two vehicles?

The car will slow down more quickly than the truck.
The truck will slow down more quickly than the car.
Both vehicles will slow down at the same rate.
The car will slow down but the truck will continue at the same speed.

Answer 18

The car will slow down more quickly than the truck.

Question 19

Which force causes graphite from the tip of a pencil to transfer to the paper?

Friction
Gravity
Air Resistance
Tension

Answer 19

Friction

Question 20

Which force keeps Jupiter in orbit around the Sun?

Air resistance
Gravity
Kinetic friction
Magnetism

Answer 20

Gravity

Question 21

Which force causes a jet airplane to stop on a runway?

Friction
Gravity
Tension
Centripetal Force

Answer 21

Friction

Question 22

Which force causes meteors to burn up when they enter Earth’s atmosphere?

Friction
Gravity
Magnetism
Tension

Answer 22

Friction

Question 23

Which kind of electromagnetic radiation carries information to and from a cell phone when it is used for a phone call?

Microwaves
X-rays
Infrared radiation
Ultraviolet radiation

Answer 23

Microwaves

Question 24

A cashier who has been handed a hundred-dollar bill may check its authenticity by holding it under a special lamp that emits electromagnetic radiation mostly at wavelengths slightly shorter than visible light. The electromagnetic radiation makes a pattern of previously invisible markings on the bill glow brightly, or fluoresce.

Which kind of electromagnetic radiation does the lamp emit to produce this effect?

Microwaves
Infrared radiation
Ultraviolet radiation
X-rays

Answer 24

Ultraviolet radiation

Question 25

After natural disasters, first responders can locate survivors in the rubble by using thermal detectors. Because the victims’ bodies are warmer than their surroundings, the difference in temperature is detected by electromagnetic waves.

Which part of the electromagnetic spectrum is being detected?

Radio waves
Infrared radiation
Ultraviolet radiation
X-rays

Answer 25

Infrared radiation

Question 26

Airport security uses electromagnetic radiation to form images of objects inside passenger luggage.

Which type of electromagnetic radiation is used in this way?

Radio waves
Visible light
Ultraviolet radiation
X-rays

Answer 26

X-rays

Question 27

Which type of wave has a longitudinal motion?

Gamma waves
Transverse waves
Sound waves
Light waves

Answer 27

Sound waves

Question 28

Which is a characteristic of electromagnetic waves?

Transverse wave motion
Travels faster through water than air
Longitudinal wave motion
Can travel only through a vacuum

Answer 28

Transverse wave motion

Question 29

A slingshot is a Y-shaped stick with rubber bands between the prongs for shooting stones and other small projectiles. A stone is shot by first placing it in the slingshot holder, which is attached to the rubber bands. The stone and holder are then pulled back, stretching the rubber bands. When released, the stone is propelled forward and leaves the slingshot at a high speed.

Which type of energy transformation occurs from the point when the rubber bands are fully stretched to when the stone leaves the slingshot?

Chemical potential energy is converted into gravitational potential energy.

Gravitational potential energy is converted into thermal energy.

Chemical potential energy is converted into gravitational potential energy.

Elastic potential energy is converted into kinetic energy.

Answer 29

Elastic potential energy is converted into kinetic energy.

Question 30

Which type of energy conversion occurs at the moment fireworks explode?

Elastic potential energy is converted into thermal energy.
Gravitational potential energy is converted into thermal energy.
Chemical potential energy is converted into kinetic energy.
Elastic potential energy is converted into gravitational potential energy.

Answer 30

Chemical potential energy is converted into kinetic energy.

Question 31

What energy conversion takes place as a box slides to a stop on a horizontal table?

Kinetic energy is converted into thermal energy.

Gravitational potential energy is converted into kinetic energy.

Chemical potential energy is converted into gravitational potential energy.

Elastic potential energy is converted into gravitational potential energy.

Answer 31

Kinetic energy is converted into thermal energy.

Question 32

What energy conversion occurs in a car’s engine?

Kinetic energy is converted into elastic potential energy.
Gravitational potential energy is converted into electrical potential energy.
Chemical potential energy is converted into thermal energy.
Thermal energy is converted into gravitational potential energy.

Answer 32

Chemical potential energy is converted into thermal energy.

Question 33

Which of the following is used to increase friction?

scattering sand on icy roads

spraying a lubricant onto a squeaky wheel

waxing floors

Answer 33

scattering sand on icy roads

Question 34

In which of the following situations is the object’s potential energy changing?

a child sledding down a hill

a man biking at 20 miles per hour on a straight road

a person rowing a canoe on a lake

a jug of milk standing on the top shelf in a refrigerator

Answer 34

a child sledding down a hill

Question 35

Which has a greater thermal energy, coffee at 80°C in a cup or water at 80°C in a swimming pool?

The water in the pool has a greater thermal energy, because it contains many more molecules, and thermal energy measures the average energy of the particles.

The coffee and the water in the pool have the same thermal energy, which in both cases is 80°C.

The water in the pool has a greater thermal energy, because it contains many more molecules, and thermal energy measures the total energy of all the particles.

Answer 35

The water in the pool has a greater thermal energy, because it contains many more molecules, and thermal energy measures the total energy of all the particles.