Define impulse
Product of average force and time of impact
How to find impulse from a graph
Area under the Force-Time graph
State the Principle of Conservation of Momentum
Total momentum of a system is conserved when no net external force acts on the system
Define inelastic collision
Total KE is less than before collision
Define perfectly inelastic collision
Colliding objects stick together and move with same velocity after collision
Define elastic collision
Total KE remains the same before and after collision
Define head-on collision
Collision in which the centre of mass of colliding bodies move along the same straight line before and after collision
Explain elastic collision by considering conservation of momentum and KE
Relative speed of approach equals relative speed of separation
Explain total energy for collisions
Total energy is conserved
Explain total momentum for collisions
Total linear momentum is conserved
Explain individual momentum in a collision
Individual momentum is not conserved as there is external resultant force on each individual body
