Energy Flashcards

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1
Q

What is energy

A

Energy is the ability to do work

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2
Q

How is energy measured

A

Energy is measured in Joules

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3
Q

What is the equation for work done

A

Work done = force (N) * Distance (m)

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4
Q

How can you find the amount of energy transferred to an object

A

Find the amount of work done

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5
Q

What are the eight energy stores

A
Gravitational Energy
Kinetic Energy
Elastic Energy
Thermal Energy
Chemical Energy
Magnetic Energy
Electrostatic Energy
Nuclear Energy
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6
Q

How do objects gain Gravitational Potential Energy

A

Objects gain G.P.E by increasing by moving higher

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7
Q

What is the equation for G.P.E

A

mass (kg) * gravitational force (10) * height (m)

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8
Q

Name 2 objects that store G.P.E

A

An object on top of a shelf, an airplane flying

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9
Q

How do objects that store Kinetic Energy have the ability to do work

A

Objects that store K.E have the ability to do work by changing their speed

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10
Q

What is the equation for K.E

A

mass * speed (squared) / 2

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11
Q

Name 2 objects that store K.E

A

A person running, A moving bike

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12
Q

How do objects that store elastic energy have the ability to do work

A

Objects that store elastic energy have the ability to do work by changing their shape

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13
Q

Name 2 objects that store elastic energy

A

A stretched bow, a slinky

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14
Q

How do objects that store thermal energy have the ability to do work

A

Objects that store thermal energy have the ability to do work by changing their temperature

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15
Q

Where is chemical energy stored

A

Chemical energy is stored in the bonds between the particles of the material

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16
Q

What are four ways of energy transfer

A

Mechanically: energy is transferred when a force acts through a distance
Electrically: Energy is transferred by the flow of electric charge in an electrical circuit
By Heating: energy transferred due to temperature difference
By Radiation: Energy transferred by waves

17
Q

How is energy transferred through heating

A

Energy is transferred from a hotter object to a cooler one, causing the difference in temperature between them to decrease

18
Q

How is energy transferred mechanically

A

Energy is transferred when a force acts through a distance, causing the position of an object to change

19
Q

How is energy transferred electrically

A

Energy is transferred electrically through the flow of electric charge in an electrical circuit

20
Q

How is energy transferred through radiation

A

Energy is transferred by waves through materials and from place to place

21
Q

What is the equation for efficiency

A

useful energy output / total energy input

22
Q

Where is wasted energy transferred to

A

Wasted energy is transferred to the surroundings as thermal energy