# Momentum, Energy and Work

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- Created by: xkirarobertsJSTCx
- Created on: 21-02-16 21:55

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- Work, Momentum and Energy
- Equations
- Work=Force applied x Distance
- Force = newtons
- Work = Joules
- Distance = metres

- Work = Joules

- Force = newtons
- Weight = Gravitational field strength x mass
- GFS = 10N on earth

- Change in gravitational potential energy = mass x GFS x height
- Power = Energy÷time
- Kinetic energy = 1/2 x mass x velocity
- Momentum = mass x velcoity
- M1V1 = M2V2

- Work=Force applied x Distance
- Gravitational potential energy is the energy from how high you are.
- Mass is the amount of stuff inside you
- Momentum is the measure of how much momentum there is in an object
- During a collision, the law of conservation of momentum applies in a closed system - the total momentum before an event is equal to the total momentum after the event
- For example: an 80kg rugby player ran at a velocity of 5m/s.... an 800kg car moves with the same momentum as the rugby player. Calculate the velocity of the car when the momentum of the rugby player moves at 400kgm/s: 800kg x velocity = 400kgm/s... velocity = 400/800 = 0.5m/s

- During a collision, the law of conservation of momentum applies in a closed system - the total momentum before an event is equal to the total momentum after the event
- Impact Forces
- if you increase the amount of time involved in the collision then there is more time for the force to be dissipated out of the collision = less injuries
- Decelleration = change in velocity / time

- Equations

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