GCSE Physics Unit 2 Revision (2)

Momentum and Collisions

• Momentum (kg m/s) = mass (kg) x velocity (m/s)
• The greater the mass of an object and the greater its velocity, the greater its momentum will be.
• Momentum is a vector quantity, so it has size and direction.
• Momentum before = momentum after.
• Momentum is conserved when no external forces act.
• Forces are what cause changes in momentum.
• Force acting = change in momentum (kg m/s)/ time taken for change to happen (secs)
• …