Work, energy and momentum - key points

Energy and work
1. Work is done on an object when a force makes the object move
2. Work done to overcome friction is transferred as energy that heats the objects that rub together and the surroundings
3. Energy transferred =
  1. Word done
4. Work done (joules) =
  1. force (newtons) x distance moved in the direction of the force (metres)
Kinetic energy
1. The kinetic energy of a moving object depends on its mass and its speed
2. Elastic potential energy is the energy stored in an elastic object when work is done on the object
3. Kinetic energy (J) =
  1. 1/2 x mass(kg) x speed(m/s/s)
Gravitational potential energy
1. The gravitational potential energy of an object depends on its weight and how far it moves vertically
2. The change of gravitational potential energy of an object is equal to its mass x the gravitational field strenght x its change of height
3. The gravitational potential energy of an object increases when the object goes up and decreases when the object goes down
Momentum
1. Momentum =
  1. mass x velocity
2. The unit of momentum is kg m/s
3. Momentum is conserved whenever objects interact, provided the objects are in a closed system so that no external forces act on them.
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	Created by 01west over 10 years ago