Question 1

Which of the following best describes the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed from one form to another.

Answer

Energy can be created from nothing.

Answer

Energy can only be stored, not transformed.

Answer

Energy is always lost in transformations.

Question 2

A girl is standing at the top of a slide before she moves. As she slides down, her potential energy decreases. According to the law of conservation of energy, what is happening to that energy?

Accepted Answer

The potential energy is being transformed into kinetic energy and heat energy.

Answer

The potential energy is being converted into new matter within the girl\'s body.

Answer

The potential energy is being destroyed as she reaches the bottom of the slide.

Answer

The potential energy is disappearing because gravity is using it up to pull her.

Question 3

When a toaster is plugged into a wall outlet and turned on, it converts electrical energy into thermal energy to toast bread. How does this process demonstrate the law of conservation of energy?

Accepted Answer

It shows that energy was not created or destroyed, but changed from one form into another.

Answer

It shows that the electricity was destroyed once the bread became hot enough to eat.

Answer

It shows that energy can be removed from a system without being changed into a new form.

Answer

It shows that the toaster created new heat energy that did not exist before it was used.

Question 4

A battery-powered flashlight is turned on, converting chemical energy from the batteries into light and heat. Which statement best explains this transformation in terms of the law of conservation of energy?

Accepted Answer

The total amount of energy remains constant as it changes from chemical to light and heat energy.

Answer

The light and heat energy are newly created by the flashlight without using any previous energy.

Answer

The chemical energy is destroyed to create the light energy needed to see in the dark.

Answer

The battery stores energy that eventually disappears once the flashlight has been turned off.

Question 5

A pendulum swings back and forth. At the highest point of its swing, it has the most potential energy, and at the lowest point, it has the most kinetic energy. What does this tell us about the energy in the system?

Accepted Answer

The energy is constantly transforming between potential and kinetic forms while the total energy remains the same.

Answer

The energy is disappearing every time the pendulum changes direction at the peak of its arc.

Answer

The energy is being used up by the atmosphere until the pendulum eventually runs out of energy.

Answer

The energy is being created at the top of the swing and destroyed at the bottom of the swing.

Question 6

A roller coaster car is pulled to the top of a tall hill and then released. As it speeds down the track, what happens to the energy within the system?

Accepted Answer

The potential energy at the top is transformed into kinetic energy and heat energy.

Answer

The total amount of energy increases because the car is moving at a high speed.

Answer

The kinetic energy is created from nothing as the car begins to move faster.

Answer

The potential energy is destroyed as the roller coaster car loses its height.

Question 7

Which of the following describes the energy transformation that occurs when a person rubs their hands together rapidly to get warm?

Accepted Answer

Mechanical energy is transformed into thermal energy due to friction.

Answer

Thermal energy is created from nothing because of the fast movement.

Answer

Chemical energy is destroyed to make room for thermal energy.

Answer

Mechanical energy is transformed into electrical energy in the skin.

Question 8

A toy car is pushed across a floor and eventually comes to a stop. According to the law of conservation of energy, what happened to the kinetic energy the car had while it was moving?

Accepted Answer

The kinetic energy was transformed into thermal energy and sound energy due to friction.

Answer

The kinetic energy was destroyed once the car ran out of force to keep it moving.

Answer

The kinetic energy disappeared because energy is not conserved when an object stops.

Answer

The kinetic energy was converted into new matter that stayed on the surface of the floor.

Question 9

An electric fan is plugged into an outlet and turned on. Which statement best represents the law of conservation of energy in this system?

Accepted Answer

Electrical energy is transformed into mechanical energy of the spinning blades.

Answer

The electrical energy is destroyed once the fan starts moving at a high speed.

Answer

The total energy in the system increases because the fan is producing more wind.

Answer

The fan creates new mechanical energy out of the air surrounding the blades.

Question 10

A student drops a basketball from a height of 2 meters. As the ball falls toward the ground, which statement best describes the energy transformation taking place?

Accepted Answer

Potential energy is being transformed into kinetic energy as the ball speeds up.

Answer

Kinetic energy is being converted into potential energy as the ball nears the floor.

Answer

Potential energy is being destroyed to allow the ball to gain speed and motion.

Answer

The total energy of the system is increasing because the ball is falling faster.

Question 11

Which of the following is an example of energy transforming from one form to another?

Accepted Answer

A light bulb converts electrical energy into light and heat.

Answer

A car uses gasoline to move.

Answer

The sun sets in the evening.

Answer

A rock sitting on the ground has potential energy.

Question 12

If a ball is rolling down a hill and eventually stops at the bottom, which statement best describes what happened to its energy according to the law of conservation of energy?

Accepted Answer

The mechanical energy was transformed into other forms like heat and sound.

Answer

The energy was created by the friction of the grass as the ball rolled.

Answer

The energy disappeared because the ball ran out of force to keep moving.

Answer

The energy was completely destroyed as the ball slowed down to a stop.

Question 13

A student drops a basketball from a height of

2

meters. Which statement best explains the energy transformation as the ball falls toward the floor?

Accepted Answer

Potential energy is transformed into kinetic energy as the ball gains speed.

Answer

Kinetic energy is transformed into potential energy as the ball falls down.

Answer

Potential energy is destroyed as the ball gets closer and closer to the floor.

Answer

The total amount of energy increases because the ball is moving much faster.

Question 14

A battery-powered flashlight transforms energy to produce a beam of light. According to the law of conservation of energy, what happens to the chemical energy stored in the batteries?

Accepted Answer

It is transformed into electrical energy and then into light and heat energy.

Answer

It is used up by the bulb until all of the stored energy is eventually destroyed.

Answer

It is turned into potential energy that stays inside the flashlight forever.

Answer

It is transformed into new energy that did not exist before the light was on.

Question 15

Which of the following occurs when a person rubs their hands together quickly to stay warm?

Accepted Answer

Mechanical energy is transformed into thermal energy due to friction.

Answer

Thermal energy is created from nothing by the movement of the hands.

Answer

Potential energy is destroyed to make the hands feel much warmer.

Answer

Chemical energy is transformed into potential energy in the skin.

Question 16

An electric motor is used to pull a heavy box across the floor. How does this system demonstrate the law of conservation of energy?

Accepted Answer

Electrical energy is transformed into kinetic energy and some thermal energy.

Answer

The motor creates new energy to make the heavy box start moving forward.

Answer

The energy is destroyed as the motor works harder to pull the heavy box.

Answer

The total amount of energy in the system increases as the box moves faster.

Question 17

A roller coaster car is at the very top of a tall hill, paused for a split second before dropping. Which statement best describes the energy of the car at this moment?

Accepted Answer

The car has maximum potential energy which will transform into kinetic energy as it goes down.

Answer

The car has maximum kinetic energy that will transform into potential energy as it drops.

Answer

The car has no energy because it is not moving at the top of the roller coaster hill.

Answer

The car is creating new energy to help it travel through the rest of the metal track.

Question 18

A student uses a hand-crank generator to power a small light bulb. Which energy transformation is taking place within this system?

Accepted Answer

Mechanical energy from the student is transformed into electrical and light energy.

Answer

Potential energy is destroyed as the student turns the handle of the generator.

Answer

Electrical energy is being created from nothing by the movement of the crank.

Answer

Thermal energy is transformed into chemical energy to make the light bulb glow.

Question 19

When a person eats food and then goes for a run, which energy transformation is primarily occurring within the body?

Accepted Answer

Chemical energy from the food is transformed into kinetic energy for movement.

Answer

Kinetic energy from the food is transformed into potential energy in the muscles.

Answer

Thermal energy is created from nothing to help the person start moving faster.

Answer

Mechanical energy is destroyed to create chemical energy needed for the run.

Question 20

When a person strikes a match against a rough surface, the friction causes the match to ignite. Which energy transformation is happening in this system?

Accepted Answer

Mechanical energy is transformed into thermal and chemical energy to produce a flame.

Answer

Chemical energy is transformed into mechanical energy to keep the match moving.

Answer

The friction creates new energy that was not present in the match or the surface.

Answer

Potential energy is destroyed to make sure the match can produce a bright light.

Question 21

What does the law of conservation of energy state?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Answer

Energy can only be created.

Answer

Energy can be destroyed.

Answer

Energy remains constant in a closed system.

Question 22

Which of these best describes the energy transformation that happens when a battery-powered flashlight is turned on?

Accepted Answer

Chemical energy is converted into electrical energy and then into light energy.

Answer

Electrical energy is converted into nuclear energy and then into light energy.

Answer

Mechanical energy is converted into light energy and then into solar energy.

Answer

Thermal energy is converted into chemical energy and then into light energy.

Question 23

A roller coaster car sits at the top of a tall hill before it starts moving. According to the law of conservation of energy, what happens as the car speeds down the track?

Accepted Answer

The potential energy of the car transforms into kinetic energy as it moves.

Answer

The car gains new energy from the track to increase its total amount of energy.

Answer

The kinetic energy is transformed into potential energy as the car speeds up.

Answer

The potential energy is destroyed as the car begins to move down the hill.

Question 24

Which statement describes what happens to the energy of a bouncing ball when it eventually stops moving on the floor?

Accepted Answer

The mechanical energy is transformed into other forms like sound and thermal energy.

Answer

The total energy of the ball is destroyed once the ball stops moving on the floor.

Answer

The energy of the ball disappears because it was used up during the bouncing motion.

Answer

The energy is lost from the universe because the ball no longer has any potential energy.

Question 25

Imagine you are rubbing your hands together on a cold day to get warm. How does the law of conservation of energy explain this?

Accepted Answer

Mechanical energy from your hands moving is transformed into thermal energy.

Answer

The total energy in your body decreases because energy is lost during the rubbing.

Answer

Thermal energy is destroyed by the friction between your palms while they move.

Answer

New energy is created by your muscles to make your hands feel much warmer.

Question 26

An electric fan is plugged into a wall outlet and turned on. Which statement correctly describes the energy transformation taking place?

Accepted Answer

Electrical energy is transformed into mechanical energy and thermal energy.

Answer

Chemical energy is transformed into potential energy and electrical energy.

Answer

Mechanical energy is converted into electrical energy and chemical energy.

Answer

Thermal energy is converted into nuclear energy and mechanical energy.

Question 27

A student drops a basketball from a height of

2

meters. Which statement accurately describes the energy of the ball as it falls toward the ground?

Accepted Answer

The potential energy decreases while the kinetic energy increases.

Answer

The total energy of the ball increases as it gains speed.

Answer

The kinetic energy decreases while the potential energy increases.

Answer

The potential energy transforms into chemical energy and light.

Question 28

When you use a toaster to brown a piece of bread, what energy transformation is primarily taking place within the system?

Accepted Answer

Electrical energy is transformed into thermal energy and light energy.

Answer

Mechanical energy is transformed into potential energy and light.

Answer

Nuclear energy is transformed into chemical energy and thermal energy.

Answer

Chemical energy is transformed into mechanical energy and sound.

Question 29

Which of these is the best example of energy being transformed from potential energy into kinetic energy?

Accepted Answer

A child sliding down a slide at a playground.

Answer

A rock sitting still at the bottom of a hill.

Answer

A battery sitting on a shelf by itself.

Answer

A lamp plugged into a wall that is turned off.

Question 30

A girl uses a bow and arrow to hit a target. She pulls the string back and holds it for a moment before letting go. Which energy transformation occurs at the moment she releases the string?

Accepted Answer

Potential energy stored in the string is transformed into kinetic energy of the arrow.

Answer

Chemical energy from the bow is transformed into potential energy as the arrow moves.

Answer

Kinetic energy is created from nothing when the arrow begins its flight toward the target.

Answer

Thermal energy from the air is transformed into mechanical energy to push the arrow forward.

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