## Pages in this set

### Page 1

Unit 1.3 ­ Momentum and Energy

There are eight main types of energy. They are:

Gravitational Potential Energy
Sound
Heat
Electrical
Kinetic
Chemical
Light
Elastic Potential

Energy transformation

Consider you are in a car moving along a road. You cut the engine and then go up and over a hill.…

### Page 2

As it climbs the hill, the kinetic energy is transformed into gravitational potential energy.

As it comes back down the other side, the gravitational potential energy turns back into kinetic
energy.

Finally, the kinetic energy becomes heat energy as the brakes are applied to stop the car.

Work done
In…

### Page 3

Where:

Ep = Gravitational potential energy in Joules (J)

Mg = mass in kilograms (kg) {remember, w = mg}

H = height in metres (m)

Kinetic Energy
This is the energy that all moving objects have. The amount of kinetic energy that an object has
depends on its mass &…

### Page 4

Where:

P = Power in watts (w)

E = Energy in joules (J)

Ew = Work done in joules (J)

T = time in seconds (s)

The modern unit for power is the Watt (named after the Scottish scientist James Watt). Back in the
days when horses were used to…