# P2 2

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

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

P2 2.4

• Momentum - The mass of an object…

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