# Physics P2.3

- Created by: juddr12
- Created on: 16-04-14 15:39

**P2 3.1**

When force moves an object, we say that **work has been done to it** because energy is transferred to the object. Work done is measured in **Joules (J)**.

**Work done (in Joules) = Force (in Newtons) x Distance moved (in Metres)**

Work done used to overcome the force of **friction** caused energy transfer of heat. This occurs when braking in a car and when machines are in use.

**P2 3.2**

**Gravitational potential energy** is energy stored in an object when held up. The higher and object, the more gravitational potential energy it has. It can be calculated like so:

**G potential energy (in Joules) = mass (in KG) x gravitational field strength (in N/KG) x change in height (in Metres)**

**Power** is the rate of transfer of energy. This is calculated by dividing **energy (in joules) by time (in seconds)**.

**P2 3.3**

All objects that contain kinetic energy are moving. The bigger the mass and the faster it moves, the higher the kinetic energy is.

**Kinetic energy (in Joules) = 1/2 x mass (in KG) x speed****[squared]**** (in metres per**…

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