Momentum
- Created by: Jo Wells
- Created on: 28-12-12 19:43
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- Momentum (kg m/s)
- Momentum (p) = mass X velocity
- P = m X V
- Greater mass & velocity = more momentum
- Is a vector quantity
- Conservation of Momentum
- In a CLOSED SYSTEM (no external forces) momentum Before = momentum After
- Collisions & Explosions
- Choose which direction is "positive", then work out total momentum before & after
- Then make sure they are equal
- NB: momentum before explosions = ZERO - so momentum must = zero after, meaning projectile (e.g. bullet) will go forwards (positive) & system will go backwards (negative) = RECOIL
- Choose which direction is "positive", then work out total momentum before & after
- Forces cause changes in momentum
- Larger force = faster change in momentum
- So, if a person's momentum changes v.quickly, they'll be subjected to large forces
- Larger force = faster change in momentum
- Momentum (p) = mass X velocity
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