Momentum Mass X Velocity.

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Presentation transcript:

Momentum Mass X Velocity

The Principle of Conservation of Momentum In collisions in a closed system momentum before impact equals momentum after impact. Mass 2000Kg Velocity ?m/s Momentum 60000Kgm/s Mass 1000Kg Velocity 60m/s Momentum 60000Kgm/s An elastic collision

For collision in a closed system momentum is conserved Mass 20Kg Velocity 10m/s Momentum 200Kgm/s Mass 20 + 20Kg Velocity ?m/s Momentum 200Kgm/s An inelastic collision

Momentum The velocities of objects travelling in different directions are given different signs

Some examples A car travelling at 100m/s and of mass 1600kg collides and remains attached to another car of mass 2400Kg that is parked. If they stay together after collision, what is the speed of the wreckage.

Answer Momentum before = Momentum after (MV)1 +(MV)2 = (M1+M2)V 1600x100 + 2400x0 = (1600+2400)V 160000 + 0= 4000V V = 40m/s

Recoil A cannon ball weighs 10Kg and the cannon has a mass of 600 Kg. If the recoil velocity of the cannon is 0.5m/s, what is the speed of the cannon ball?

Answer Momentum before = Momentum after (MV)1 +(MV)2 = (MV)1 - (MV)2 (10x0) + (600x0) = (10xV) – (600x0.5) 0 + 0 = 10v – 300 10V = 300 V = 30m/s

Newtons cradle