year 9 physics

Ways of storing energy

Chemical energy, kinetic energy, thermal energy, elastic potential energy, gravitational potential, nuclear energy

How is chemical energy stored

In food fuel batteries

How is kinetic energy stored?

In moving objects

How is thermal energy stored?

In hot objects

How is elastic potential energy stored?

In object a stretched squashed or twisted

How is gravitational potential energy stored?

Objects move to high places

How is Nuclear energy stored

Impractical

What is a unit of energy?

joules j

What does dissipated mean?

When wasted energy spreads out into surrounding areas

How to reduce dissipated of energy by friction

by using lubrication

How to reduce dissipation of energy by heating

Thermal insulation

Efficiency

Useful energy transferred / Total energy supplied * 100%

Conduction

Transfer of heat in a solid by vibrations being passed between particles

Are metals or wood better for conduction?

Metal

Convection

The transfer of heat in a fluid (Gas or liquid)

Radiation

The transfer of heat in waves (No particles needed)

What is the best surface to admit and absorb radiation?

Dark dull surfaces

What is the unit for gravitational potential energy?

N/kg

Change in gravitational potential energy

Mass * Gravitational field strength * Height

Kinetic energy

½ * mass ^ velocity square

Types of resources

Cold oil, natural gas and Nuclear fuels

Burning coal oil and a natural gases produces

Energy and carbon dioxide

Nuclear power produces

Radioactive waste

Downside of nuclear power

It can cause major Accidents and is very expensive