# Topic 1 Momentum Basics Module 4

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• Created by: Aoife
• Created on: 15-01-13 21:06
• Momentum
• Definition= mass x velocity
• Newton's 2nd:  The rate of change of momentum is proportional to the resultant force and in opposite direction
• F= (mv-mu) / t
• Ft (Ns) = impulse
• v-u / t = a so  F=ma
• k=1 defined
• M1U1 + M2U2 = M1V1 + M2V2
• In an explosion, put = to zero!
• Conservation of Linear Momentum : The total momentum of a system before and after a collision = constant provided no external force acts.
• Conservation of Linear Momentum : The total momentum of a system before and after a collision = constant provided no external force acts.
• Constant mass changing v so F= dP/t
• Constant v changing mass so F=dP/t
• Constant mass changing v so F= dP/t
• Constant v changing mass so F=dP/t
• Elastic collisions KE conserved