physics p2 0.0 / 5 ? PhysicsGCSEEdexcel Created by: annaCreated on: 13-12-12 12:51 A measure of how quickly the velocity of something is changing. acceleration 1 of 5 The theory that describes how particles must collide with enough energy to react collision theory 2 of 5 A vehicle safey device in which part of the vehicle is designed to crumple in a crash. crumple zone 3 of 5 A force between two surfaces that risists motion friction 4 of 5 The time taken to respond to a simulus reaction time 5 of 5
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