Which of the following best demonstrates the conservation of energy?

A light bulb converting electrical energy to light and heat

A ball rolling to a stop due to friction

A battery running out of charge

If you use a lever to lift a heavy rock, what advantage does the lever provide?

Changes the direction of the force and makes lifting easier

Increases the weight of the rock

Reduces the amount of work needed

Increases the distance the rock moves

Which of the following is an example of work being done?

Holding a book still above your head

A student claims that using a longer ramp makes it easier to push a heavy box into a truck. Explain why this is true using the concept of simple machines.

The longer ramp decreases the force needed by increasing the distance over which the force is applied

The longer ramp increases the force needed

The longer ramp does not affect the force needed

The longer ramp increases the work done

A moving car comes to a stop as the brakes are applied. Describe the energy transformation that occurs.

Kinetic energy is transformed into thermal energy due to friction

Potential energy is transformed into kinetic energy

Chemical energy is transformed into sound energy

Explain how the law of conservation of energy applies when a ball is thrown into the air and then falls back to the ground.

The ball’s kinetic energy is converted to potential energy as it rises, and back to kinetic as it falls

The ball loses all its energy at the top

The ball’s energy is destroyed as it falls

The ball gains energy from the air

A person uses a screw to hold two pieces of wood together. Explain how the screw acts as a simple machine in this situation.

The screw increases the distance over which the force is applied, making it easier to join the wood

The screw decreases the force needed by reducing friction

The screw changes the direction of the force

A roller coaster at the top of a hill has $$5000\,J$$ of potential energy. As it descends, it has $$5000\,J$$ of kinetic energy at the bottom (ignoring friction). What does this demonstrate?

Energy is conserved and transformed from potential to kinetic

Energy is created as the coaster moves

A person uses a wedge to split a log. Explain how the wedge makes this task easier.

The wedge changes the direction of the applied force and concentrates it on a smaller area

The wedge increases the force needed to split the log

The wedge reduces the distance the log moves

A student observes that a moving bicycle eventually comes to a stop even though no brakes are applied. Using the concept of energy transformation, explain why this happens.

The bicycle’s kinetic energy is transformed into thermal energy due to friction with the ground and air

The bicycle’s energy is destroyed

The bicycle gains energy from the ground

The bicycle’s potential energy increases

A construction worker uses a wheelbarrow to move heavy materials. Explain how the wheelbarrow acts as a simple machine to make the work easier.

The wheelbarrow reduces the force needed by allowing the worker to lift and move materials more easily over a distance

The wheelbarrow increases the force needed to lift the materials

The wheelbarrow changes the materials into energy

The wheelbarrow acts as a wedge

Which energy transformation occurs when a battery powers a flashlight?

Chemical to electrical to light

Which of the following best describes the relationship between work and energy?

Doing work on an object transfers energy to it

Work is the ability to do energy

Energy is always lost when work is done

Energy, Work and Simple Machines

Authored by Thais Blinks

Science

9th Grade

NGSS covered

Used 8+ times

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30 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a type of simple machine?

Pulley

Battery

Magnet

Light bulb

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a simple machine?

Screw

Lever

Gear

Wedge

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the law of conservation of energy?

Energy can be created but not destroyed

Energy can be destroyed but not created

Energy cannot be created or destroyed, only transformed

Energy is always lost as heat

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is an example of energy transformation?

A book sitting on a table

A battery powering a flashlight

A ruler measuring length

A magnet attracting iron

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A wind-up toy car moves after being wound up. What type of energy transformation is this?

Chemical to electrical

Elastic potential to kinetic

Thermal to mechanical

Gravitational to sound

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which energy transformation occurs when you rub your hands together and they become warm?

Electrical to chemical

Mechanical to thermal

Chemical to light

Sound to mechanical

Tags

NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Tags

NGSS.MS-PS3-5

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Energy, Work and Simple Machines

Which of the following is a type of simple machine?

Which of the following is NOT a simple machine?

What is the law of conservation of energy?

Which of the following is an example of energy transformation?

A wind-up toy car moves after being wound up. What type of energy transformation is this?

Which energy transformation occurs when you rub your hands together and they become warm?

A person uses a ramp to load a box into a truck. Which simple machine is being used?

Which of the following best demonstrates the conservation of energy?

If you use a lever to lift a heavy rock, what advantage does the lever provide?

Access all questions and much more by creating a free account

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