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1
Q

When something falls……

A

Energy is transferred from its gravitational potential energy store to its kinetic energy store.

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2
Q

What does stretching transfer energy to?

A

The elastic potential energy store.

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3
Q

What is specific heat capacity?

A

The amount of energy needed to raise the temperature of 1kg of a substance by 1 degree celsius.

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4
Q

Why would you wrap a metal block in insulating layers?

A

To reduce energy transferred to surroundings.

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5
Q

Energy is never ……..

A

Created or destroyed can only be transferred or dissipated or stored.

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6
Q

Dissipated energy is sometimes called…….because…

A

Wasted energy because the energy is being stored in away that is not useful.

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7
Q

Power is the ……………………….. …………………………….

A

Rate of doing work.

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8
Q

What is power measured in?

A

Watts

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9
Q

One watt=

A

one joule of energy transferred per second.

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10
Q

Give two examples of non-renewable energy resources??

A

Fossil fuels and nuclear fuel.

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11
Q

Name the three main fossil fuels??

A
  1. Coal
  2. Oil
  3. Gas
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12
Q

Give some examples of renewable energy resources?

A
  1. The sun
  2. Wind
  3. Water waves
  4. Hydro- electricity
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13
Q

What is the problem with renewable energy resources?

A

They don’t provide much energy and some are unreliable.

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14
Q

What is conduction?

A

The process where vibrating particles transfer energy to neigbouring particles.

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15
Q

High thermal conductivity=

A

Transfer energy between particles quicky.

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16
Q

Name two ways to stop energy travelling to completely useless stores?

A
  • Lubrication

- Thermal insulation

17
Q

What does lubrication do?

A

Reduces frictional forces

18
Q

What does insulation do?

A

Reduces the rate of energy transfers by heating.

19
Q

The less energy that is wasted=

A

The more efficient a device is.

20
Q

What are bio-fuels made from?

A

Plants and waste.