Conservation of Momentum (OCR GCSE Physics A (Gateway Science Suite)): Flashcards

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Conservation of Momentum
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Conservation of momentum principle

In a closed system: total momentum before = total momentum after

System type where momentum is conserved

Closed system

Momentum of a stationary object

Zero

Total momentum before collision (mass mm, velocity vv)

mvmv

Total momentum after collision in example

mvmv

Ball B after collision (initially stationary)

Gains velocity and momentum

Ball A's velocity after collision

Moves with reduced velocity

Sum of momentums after collision

Equals total momentum before collision

Formula: momentum before (mass mm, velocity vv, stationary)

(m×v)+(m×0)(m \times v) + (m \times 0)

Why stationary object has zero momentum

Velocity is 0, so m×0=0m \times 0 = 0

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