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Energy Year 8 GSG > Energy > Flashcards

Energy Flashcards

2
Q

Define FORCE

A

Force is a “push” or a “pull”.

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3
Q

Define WORK

A

Work is done when a force moves a mass over a distance or energy is used.

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4
Q

Define ENERGY

A

Energy is the ability to do work

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5
Q

What is the unit of energy?

A

a Joule

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6
Q

Define a “Joule”

A

A Joule of energy is the energy used to lift 100g one meter.

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7
Q

Define “kilojoule”

A

1000 Joules

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8
Q

Define “megajoule”

A

1,000,000 Joules

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9
Q

Define “Kinetic Energy KE”

A

KE is the energy of movement

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10
Q

Define “Potential Energy PE”

A

PE is stored energy

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11
Q

Name 6 forms of energy

A

kinetic, potential, sound, heat, light and electrical energy

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12
Q

Name 4 forms of Potential energy

A

Gravitational, elastic, chemical and nuclear energy

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13
Q

Define “ Gravitational Potential Energy (PE)”

A

Gravitational PE is the energy stored in an oject that is lifted or high.

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14
Q

What is elastic PE?

A

Elastic PE is the energy stored in contracted springs, stretched rubber and other elastic materials.

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15
Q

What is chemical energy?

A

The energy stored in Chemicals (eg petrol).

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16
Q

What is nuclear energy?

A

The energy stored within atoms.

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17
Q

What is sound?

A

Sound results from vibrating objects causing wave disturbance in air or other materials.

18
Q

What is heat?

A

The energy objects have by the vibration of the molecule and atoms within an object.

19
Q

What is light?

A

Light is the energy is released by the atoms of hot or burning objects (eg stars).

20
Q

What is electricity?

A

Electricity flows through conductors (eg: copper wire) when electrons move from areas of higher energy to areas of lower energy. Electrical energy can be easily converted to other forms of energy.

21
Q

Define “Energy Transfer”

A

Energy transfer happens when one object transfers its energy to another object (eg; bat to ball)

22
Q

Define “Energy Transformation”

A

Energy transformation happens when one form of eneregy is converted into another (eg: candle -> heat, light)

23
Q

What three factors that determine the amount of Gravitational Potential Energy an object has?

A

Its mass, the force of gravity and it’s height above the ground

24
Q

What two factors determine the amount of Kinetic Energy an object has?

A

Its mass and velocity

25
Q

What is the energy conversion equation for the Albany wind farm?

A

kinetic energy -> electrical energy

26
Q

What is the energy equation for a battery powered flashlight?

A

chemical energy -> electrical energy -> light energy

27
Q

What energy is “wasted” in an old light bulb?

A

heat

28
Q

What is the formula for the energy efficiency of an energy converter?

A

efficiency(%) = (useful energy/input energy)x100

Energy Year 8 GSG (2 decks)

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