# P2 2

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- Created by: Florence
- Created on: 31-12-12 12:41

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P2 2.1

- If an object stays still - no energy is transferred.
- If an object moves in the same direction as the force that is pushing or pulling the object - energy is transferred.
- Work done - Energy transferred
- Formula - W = F x d
- W - work done (J)
- F - force applied (N)
- d - distance moved (m)

- 1 joule = 1 newton metre

- Formula - W = F x d
- Energy is never destroyed or created but it can be changed from one form to another.
- Friction between moving objects causes heating.

P2 2.2

- Power - The amount of energy transferred per second (W) or the rate at which energy is transferred.
- when 1 joule is transferred in 1 second the power is 1 Watt.

- Power stations transform chemical energy from fossil fuels into electrical energy.

P2 2.3

- Any two masses will attract each other - all masses exert a gravitational pull on all other masses.
- Force of gravity - The attraction between objects on or near the earth and the earth itself.
- Work done against gravity = downward force (weight of object) x distance lifted.
- Energy transferred is stored as gravitational potential energy.
- Formula - Ep = m x g h
- Ep - potential energy (J)
- m - mass (kg)
- g - gravitational field strength (N/kg)
- h - height change in metres

- Formula - Ep = m x g h
- Kinetic energy - energy due to movement.
- formula - Ek = (0.5mv) x (0.5mv)
- Ek - kinetic energy (J)
- m - Mass (kg)
- v - speed (m/s)

- formula - Ek = (0.5mv) x (0.5mv)

P2 2.4

- Momentum - The mass of an object…

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