Conservation Laws

Law of conservation of ​ (a)   : Whenever energy is ​ (b)   from one form to another in a physical or ​ (c)   change, no energy is created or ​ (d)   .

• converted

• chemical

• destroyed

• energy

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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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The Law of Conservation of Energy states "Energy is not created or destroyed, only changed." How does the relationship between potential, kinetic, and thermal energy in this image illustrate this?

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Why can't the skater reach the same point where he was released when he goes up the other side of the ramp?

• because he is is on a planet other than earth

• because his mass is slowing him down

• because he gets tired

• because friction is slowing him down and converts some energy into heat

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Which point has the most potential energy?

• D

• F

• B

• A

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When a pendulum swings, at which point is potential energy at its greatest? (assume there is no friction)

• 1 and 5

• 2 and 4

• 3 

• 4 and 5

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When a pendulum swings, at which point is kinetic energy highest?

• 1

• 2

• 3

• 4

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Which of the following best describes the Law of Conservation of Mass?

• Mass can be created and destroyed.

• Mass can neither be created nor destroyed, only rearranged.

• Mass can be destroyed but not created.

• Mass can be created but not destroyed.

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In a closed system, if the total energy is 100 J at the beginning, what will be the total energy after a series of transformations?

• 0 J

• 50 J

• 100 J

• 200 J

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Which experiment would best demonstrate the Law of Conservation of Momentum?

• Dropping a ball from a height and measuring its bounce.

• Colliding two carts on a frictionless track and measuring their velocities before and after collision.

• Heating water and measuring the temperature change.

• Mixing two chemicals and observing the reaction.

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