Energy Conservation

Is potential energy conserved?

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Views #: 1719

Questions #: 15

Time: 10 minutes

Pass Score: 80.0%

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Pendulum swinging with no air friction

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Imagine a pendulum with no air friction. In this case, the pendulum will rise to its original height. How does the potential energy at one end of the swing compare to the potential energy at the other end?

They are equal

They are not equal

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Is potential energy conserved?

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In an example of a pendulum swinging with no air friction. The pendulum will rise to its original height and potential energy at one end point is equal to the other end point. Can we say that potential energy is conserved in this case?

Yes

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Why a swinging pendulum does not rise to exactly the same height it initially started from on the other side?

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Because it does work on the surrounding air

Because of its weight

Because of gravity

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Which pendulum will rise to almost the same height it started from?

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A pendulum that moves fast

A pendulum that moves slower

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Explanation

Consider the pendulum that hits a shoe at the bottom of its motion

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The kinetic energy of the pendulum just before it hits the shoe is (1) the potential energy it lost in falling from the left end of its swing.

In fact, if we ignore air friction and if the shoe were not there, the potential energy attained on the right end of the swing would be equal to the kinetic energy at the bottom. Now consider the effect of friction, and compare the potential energy at the right end of the swing to the potential energy originally at the left.

If friction is present, how will the potential energy at the right compare to that on the left? (2)

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equal to

greater than

less than

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The conservation of energy applies during the _______ fall of an object

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initial

entire

end

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During the fall of an object

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At any time, the (1) in potential energy is equal to the (2) in kinetic energy

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decrease

increase

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The total of the kinetic and potential energy is __________

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increasing

decreasing

constant

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Explanation

The law of conservation of energy can be stated as follows

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The total energy at the end of any event is equal to the total energy (1) the event

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A swinging pendulum starting from the left loses some energy in a form of a _______

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Missing

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At the point where a pendulum has lost 9 joules of potential energy, how much kinetic energy has it gained?

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Missing

Just right the number

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Explanation

How much potential energy is needed to develop 15 joules of kinetic energy?

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Missing

Write numbers only

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Explanation

Suppose the pendulum has 20 joules of potential energy at the top of its swing

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Missing

When the pendulum is partway down, its PE is 12 joules. How much kinetic energy does it have at this point?

Write the answer in numbers

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Explanation

A pool ball hits a second one at rest and the second one assumes the velocity of the first

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there is no kinetic energy lost and such a collision is said to be (1)

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elastic

inelastic

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When two cars collide, is the collision normally elastic or inelastic?

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elastic

inelastic

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Year 10

Pendulum swinging with no air friction

Correct Answer

Explanation

Is potential energy conserved?

Correct Answer

Explanation

Why a swinging pendulum does not rise to exactly the same height it initially started from on the other side?

Correct Answer

Explanation

Which pendulum will rise to almost the same height it started from?

Correct Answer

Explanation

Consider the pendulum that hits a shoe at the bottom of its motion

Correct Answer

Explanation

The conservation of energy applies during the _______ fall of an object

Correct Answer

Explanation

During the fall of an object

Correct Answer

Explanation

The total of the kinetic and potential energy is __________

Correct Answer

Explanation

The law of conservation of energy can be stated as follows

Correct Answer

Explanation

A swinging pendulum starting from the left loses some energy in a form of a _______

Correct Answer

Explanation

At the point where a pendulum has lost 9 joules of potential energy, how much kinetic energy has it gained?

Correct Answer

Explanation

How much potential energy is needed to develop 15 joules of kinetic energy?

Correct Answer

Explanation

Suppose the pendulum has 20 joules of potential energy at the top of its swing

Correct Answer

Explanation

A pool ball hits a second one at rest and the second one assumes the velocity of the first

Correct Answer

Explanation

When two cars collide, is the collision normally elastic or inelastic?

Correct Answer

Explanation

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