Energy Conservation Laws

What does the Law of Conservation of Energy state?

• Energy can be created and destroyed.

• Energy can neither be created nor destroyed, only transformed from one form to another.

• Energy can be destroyed but not created.

• Energy can be created but not destroyed.

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NGSS.MS-PS3-5

Which of the following is an example of kinetic energy?

• A book sitting on a table.

• A compressed spring.

• A moving car.

• A stretched rubber band.

What is the unit of energy in (SI)?

• Newton-Meters

• Joule

• kgm^2 / s^2

• all of the above

Which form of energy is stored in food?

• Kinetic energy

• Thermal energy

• Chemical energy

• Nuclear energy

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In a closed system where the only force acting on an object is gravity, as an object falls, what happens to its kinetic energy?

• KE decreases.

• KE increases.

• KE remains the same.

• KE first decreases, then increases.

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

What is energy?

• something that can exist in many forms and can be transferred between objects

• something that exists only when objects are moving

• something that can be made from matter

• The ability to do work to cause an change in an object or its environment

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How is gravitational potential energy of a rock calculated?

• PE = mgh

• PE = 1/2mg^2

• PE = 1/2mv^2

• PE = kx

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NGSS.MS-PS3-2

What is the potential energy of an object dependent on?

• Its speed

• Its temperature

• Its height and mass

• Its volume

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NGSS.MS-PS3-2

What happens to the potential energy of an object as it falls toward the Earth?

• It increases.

• It decreases.

• It remains the same.

• It first increases, then decreases.

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NGSS.MS-PS3-2