Energy stores/ transfers

Energy

the ability of an object to do work

what is energy measured in?

Joules (J)

kinetic energy

energy of a moving object

give two examples of kinetic energy

driving and walking

gravitational potential energy

energy of an object due to its height above a surface

give two examples of gravitational potential energy

holding a ball up high and a plane

chemical energy

energy stored in fuel which is released when a chemical reaction takes place

give three examples of chemical energy

battery, petrol, food

nuclear energy

energy released from nuclear reactions

give two examples of nuclear energy

nuclear power plant, the sun

thermal energy

energy of an object due to its temperature

give two examples of thermal energy

toaster, stove

magnetic energy

energy due to interacting magnetic fields

give an example of magnetic energy

a magnet

electrostatic energy

energy due to interacting charged objects

give an example of electrostatic energy

lightning

elastic potential energy

energy stored in an object that is being stretched, squashed etc

give an example of elastic potential energy

a slingshot

name the eight energy stores

• kinetic energy

• gravitational potential energy

• chemical energy

• nuclear energy

• thermal energy

• magnetic energy

• electrostatic energy

• elastic potential energy

name the energy transfers

• mechanically (due to a force)

• electrically

• by radiation (light/sound)

• by heating

what is the equation for work done?

work done = force x distance moved

equation for G.P.E

G.P.E = m x g x h

power

the rate at which work is done or the rate at which energy is transferred

equation for power involving work done (energy)

power = work done / time

equation for power involving velocity

power = force x velocity in direction of force

units for power

Watt (W)

unit for work done/ energy

Joules (J)

unit for velocity

metres per second (m/s)