Energy

The energy of a moving object due to its motion is

• Potential Energy

• Kinetic Energy

• Work

• Motion Energy

Answer explanation

Kinetic energy is the energy of an object due to its motion. The faster it's going, the more kinetic energy it has!

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What do we call energy that is stored in an object's position?

• Thermal

• Kinetic

• Nuclear

• Potential

Answer explanation

Potential energy is energy that is stored. It can be gravitational potential energy (possessed by objects that are up high off the ground) and elastic potential energy (stored in objects that are stretched out)

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An object's gravitational potential energy depends on what?

• Its mass and its speed

• The chemical bonds between its atoms

• Its height from the Earth and its mass

• Its temperature

Answer explanation

The gravitational potential energy of an object is decided by two factors: its height off the ground and its mass.

In the image above, Object C has the greatest gravitational potential energy, because it has a greater mass than Object B (which is at its same height), and it is at a greater height than Object A, which has the same mass.

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Compared to a slow-moving object, a faster-moving object has ___________

• more kinetic energy

• less kinetic energy

• the same amount of kinetic energy

• zero kinetic energy

Answer explanation

If two objects have the same mass, the one that's moving faster will have a greater kinetic energy.

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A rock balances on the edge of a cliff, about to fall. What kind of energy does it have?

• Gravitational potential energy

• Kinetic energy

• All of the above

• None of the above

Answer explanation

The rock has gravitational potential energy, because it is at a height above the ground, ready to fall.

It does not have kinetic energy, because it is not currently moving.

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A grocery cart rolls across a flat parking lot. What kind of energy best describes the energy of its wheels?

• Gravitational potential energy

• Kinetic energy

• Elastic potential energy

• None of the above

Answer explanation

The grocery cart has kinetic energy because it is moving. It does not have gravitational potential energy because it is not off the ground.

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What do we call the type of energy stored in the molecular bonds of our food?

• Elastic Potential Energy

• Gravitational Potential Energy

• Chemical Energy / Chemical Potential Energy

• All of the above

Answer explanation

The Chemical Energy in food is why we get energy from eating food

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Someone picks up a flag and waves it around in the air. What kind of energy does the flag have?

• Gravitational potential energy

• Kinetic energy

• All of the above

• None of the above

Answer explanation

The flag has gravitational potential energy because it has been lifted off the ground. The flag also has kinetic energy because it is moving.

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What kind of energy is stored in the stretch of the slingshot as it's pulled back?

• Kinetic Energy

• Gravitational Potential Energy

• Thermal Energy

• Elastic Potential Energy

Answer explanation

Although Gravitational Potential Energy and Thermal Energy might be present because the slingshot is lifted and the hand might be warm, the type of energy that is stored in the stretch/distortion of objects is Elastic Potential Energy.

Define energy in your own words

Answer explanation

A good definition of energy to remember is:

The ability to do stuff

Some other definitions are:

The ability to move or change matter

The ability to do work

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