# Work, Energy Momentum

- Created by: Fiona S
- Created on: 13-03-15 20:07

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- Work, Energy, Momentum
- Gravitational Potential Energy
- Energy an object as due to its position.
- Ep=m x g x h

- Kinetic Energy
- Energy an object has due to its movement
- Ek=1/2 x m x v^2
- Ek is proportional is v^2

- Momentum(P)
- Momentum is the product of an objects mass and velocity.
- P = m x v
- P=(kgm/s) m=(kg) v =(m/s)

- Conservation of Energy
- Energy cannot be created or destroyed, it can only be transferred
- Falling objects transfer Ep to Ek.
- Neglecting air resistance.

- Conservation of Momentum
- In a closed system the total momentum before an event is equal to the total momentum after an event.
- Assign +ve and -ve directions.

- Event = Collision or Explosion

- In a closed system the total momentum before an event is equal to the total momentum after an event.
- Power
- Power is the rate at which work is done
- P = WD/t
- P = W WD = J t = s

- Impact Force
- To decrease the impact force we must increase the impact time
- F=Change in P/t

- Work Done
- Work is done when a force acts on an object over a certain distance
- WD=Force x Distance
- WD = Joules F= Newtons D= Meters

- Distance must be in the same direction as the force
- Work done is equivalent to energy transfer

- Gravitational Potential Energy

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