Collisions 0.0 / 5 PhysicsForces and MotionIGCSEEdexcel Created by: HettieCreated on: 07-06-13 20:35 What is Newton's 3rd law? Every action has an equal and opposite reaction. 1 of 6 What is the equation for momentum? Momentum (kg m/s) = mass (kg) X velocity (m/s) P=mv 2 of 6 What is conservation of momentum? initial total momentum = final total momentum 3 of 6 What is the equation for kinetic energy? kinetic energy (J) = ½ m (kg) X v² (m/s) 4 of 6 What is the equation for impact force? Force (J) = change in momentum ÷ time F = (mv - mu) ÷ t 5 of 6 What does a seat belt or air bag do to reduce impact force? Increases time for person to stop, reducing rate at which momentum changes, therefore force of impact is less. 6 of 6

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