Conservation of Energy

How are different forms of energy related?

• they can all be transformed into other forms of energy

• none of them can be transformed into other forms of energy

• they can be created

• they can be destroyed

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Whenever a moving object experiences friction, some of its kinetic energy is transformed into __________ energy.

• thermal

• electrical

• nuclear

• mechanical

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At which point is potential energy greatest?

• W

• X

• Y

• Z

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

• 1

• 2

• 3

• 4

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A 0.40 kilogram bird is flying at a constant speed of 8.0 m/s. What is the bird's kinetic energy ?

• 3.2 J
• 4.2 J
• 2.0 J
• 12.8 J

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How can I gain potential energy? (choose the best answer)

• Run a mile
• Walk up the stairs
• Climb a mountain
• Go down the stairs

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What is mechanical energy?

• It is what metal creates when heated.
• All potential and kinetic energy in a system.
• It is motion of all matter.
• Energy of momentum.

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What type of energy is in this picture?

• Kinetic
• Potential
• Chemical
• Sound

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What is energy?

• rate of work
• Motion of an object
• ability to do work
• force over time

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Which of the following has the most potential energy?

• A car at the top of a hill
• A car speeding down the hill
• A person at the top of a hill
• An acorn falling off a tree

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