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…

Comments

Flying_L3mon38

very helpful

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