Kinetic and potential energy stores

Energy

What is kinetic energy measured in?

Joules

What is mass measured in?

kg

What is speed/velocity measured in?

m/s

What is kinetic energy?

Movement energy

When does something have gravitational potential energy?

When it is off the ground.

Kinetic energy equation

E = ½ mv²

Gravitational potential energy equation

E = mgh

What happens to an objects energy when it falls?

It loses gravitational potential energy and gains kinetic energy.

What happens when you stretch an object?

It gains elastic potential energy.

Elastic potential energy equation

E = ½ ke²

What does heating a material do its energy?

It transfers the energy to its thermal energy store - the temperature increases.

What happens to energy in a kettle when it is heated up?

• Energy is transferred to thermal energy store of the kettle.

• Energy is then transferred by heating to the waters thermal energy store.

• The temperature of the water then increases.

Do all materials need the same energy to increase temperature?

No, some materials need more energy to increase their temperature than others.

Specific heat capacity equation

ΔE = mcΔθ

What is specific heat capacity?

The amount of energy needed to raise the temperature of 1kg of a material by 1 ‘c.