Work, Energy and Power Flashcards

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1
Q

What is kinetic energy?

A

the energy associated with the motion of an object with mass

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2
Q

What is gravitational potential energy?

A

the energy stored by an object at a point in a gravitational field

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3
Q

What is elastic potential energy?

A

the energy stored as a result of a reversible change in an object’s shape

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4
Q

What is electric potential energy?

A

the energy of charges due to their position in an electric field

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5
Q

What is sound energy?

A

the energy of a mechanical wave due to the movement of atoms

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6
Q

What is internal energy?

A

the sum of randomly distributed kinetic and potential energies of the molecules in a substance

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7
Q

What is electromagnetic energy?

A

the energy from electromagnetic waves, stored within oscillating fields

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8
Q

What is nuclear energy?

A

the energy stored in a nuclei, released when particles in nuclei rearrange

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9
Q

What is chemical energy?

A

the energy contained in chemical bonds, released when atoms rearrange

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10
Q

What is the principle of the conservation of energy?

A

in a closed system, energy cannot be created or destroyed but only transferred from one form to another

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11
Q

Define work done:

A

energy transfer using a force (fx) when direction of movement and force act in the same direction

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12
Q

Define power:

A

how fast you use your energy (e or wd/ time) or (f x v)

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13
Q

Define efficiency:

A

measure of how much energy is conserved as useful energy

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14
Q

How do you calculate efficiency?

A

(useful output energy)/(total input energy) x 100

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