Conservation Laws

Why won't the roller coaster reach over the second hill?

• because it is going slow

• because it does not have enough original kinetic energy at the first hill

• because it does not have enough original potential energy at the first hill

• because energy cannot be destroyed

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^{Which point has the greatest kinetic energy?}

• W

• X

• Y

• Z

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The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed

• Energy cannot be created or destroyed, it can only transformed

• Energy can't be created, destroyed or transformed

• Energy cannot be created or destroyed.

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A 500-gram block of solid cheese is melted in a pot. Which is most likely the mass of the cheese after it is melted?

• 500 grams, because the cheese does not gain or lose mass just because it was melted

• 499 grams, because some of the cheese evaporates as it melts

• 502 grams, because the cheese absorbs heat as it melts

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The law of conservation of energy says the total energy before the change _______ the total energy after it

• is less than

• is more than

• affects

• equals

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2 balls collide and bounce off of each other. During the collision total momentum remained constant and total kinetic energy remained constant. What type of collision is this?

• Inelastic Collision

• Elastic Collision

• Perfectly Inelastic Collision

• No collision occurred

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Where is potential energy changing to kinetic energy?

• a

• b

• c

• d

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

• Mass can be created or destroyed in a closed system.

• Mass cannot be created or destroyed in a closed system.

• Mass can be transformed into energy in a closed system.

• Mass can be increased by adding energy in a closed system.

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In a closed system, if the total mechanical energy is conserved, which of the following must be true?

• Potential energy is always zero.

• Kinetic energy is always zero.

• The sum of potential and kinetic energy remains constant.

• The sum of potential and kinetic energy decreases over time.

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A car engine converts chemical energy from fuel into mechanical energy. According to the Law of Conservation of Energy, what happens to the energy that is not converted into mechanical energy?

• It is destroyed.

• It is converted into heat and sound energy.

• It remains as chemical energy.

• It is converted into electrical energy.

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