Physics

Energy sources

Thermal / Kinetic / Gravitational Potential / Elastic Potential / Chemical / Magnetic / Electrostatic / Nuclear

1 of 24

What is a system?

A system is just a fancy word for a single object (e.g.the air in a piston) or a group of objects (e.g.two colliding vehicles)

2 of 24

Describe the energy transfers that occur when a car collides with a stationary object

The normal contact force between the car and the object does work. It causes energy to be transferred from the car's kinetic energy store to other energy stores, e.g. the elastic potential and thermal energy stores of the object and the car body.

3 of 24

If energy is transferred to an objects kinetic energy store, what happens to its speed?

Anything that is moving has energy in its kinetic energy store. Energy is transferred to this store when an object speeds up and is transferred away from this store when an object slows down

4 of 24

Give the equation for finding the energy in an objects gravitational potential energy store

Gravitational Potential Energy = Mass x Gravitational Field Strength x Height

5 of 24

What kind of energy store is energy transferred to when you compress a spring?

Stretching and squashing an object can transfer energy to its elastic potential energy store

6 of 24

What does the variable 'e' stand for in the equation for energy in an elastic potential energy store?

Extension

7 of 24

What is the definition of the specific heat capacity of a material? (RP)

Specific heat capacity is the amount of energy needed to raise the temperature of 1 kg of a substance to 1 Degrees Celsius

8 of 24

Suggest why a material with a high specific heat capacity is better suited for use in a heating system than a material with a low specific heat capacity

It keeps in more heat

9 of 24

True of False? Energy can be destroyed

FALSE

10 of 24

Give two equations to calculate power

Power = Energy Transfer/Time OR Power = Work Done/Time

11 of 24

True or False? A high thermal conductivity means there is a high rate of energy transfer

TRUE

12 of 24

How can you reduce unwanted energy transfers in a machine with moving components?

Lubrication and thermal insulation

13 of 24

Give 4 ways to prevent unwanted energy transfers in a home

Cavity wall insulation / Loft insulation / Double glazed windows / Draught excluders

14 of 24

True or False? Thicker walls make a house cool down quicker

FALSE

15 of 24

Give the equation that relates efficiency to power

Efficiency = Useful Power Output /Total Power Input

16 of 24

Name the renewable energy resources

The sun (Solar) / Wind / Water Waves / Hydro-electricity / Bio-fuel / Tides / Geothermal

17 of 24

What is the difference between renewable and non-renewable energy resources?

Renewable: Never run out / Non-renewable: Will all run out one day

18 of 24

Give an example of how a renewable energy resource is used in everyday life

Solar water heaters work by using the sun to heat water which is then pumped into radiators in the building

19 of 24

Explain why solar power is considered to be a fairly reliable energy resource

Because it is only really reliable in the daytime

20 of 24

Give one environmental impact of using wave power to generate electricity

The main problems are disturbing the seabed and the habitats of marine animals, spoiling the view and being a hazard to boats

21 of 24

Describe how you can reduce the acid rain caused by burning coal and oil

Acid rain can be reduced by taking the sulfur out before the fuel is burned, or cleaning up the emissions

22 of 24

Give one environmental benefit of using nuclear power

Nuclear power is clean but the waste is very dangerous and difficult to dispose of

23 of 24

Explain why the UK plans to use more renewable energy resources in the future

Because non-renewable resources damage the environment and they will eventually run out

24 of 24

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Physics

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Other cards in this set

Card 2

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Card 3

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Card 4

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Card 5

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Back

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