In a car crash, crumple zones reduce injury because they:

  1. stop momentum being conserved
  2. increase the car's mass
  3. increase the collision time, reducing the force
  4. reduce the change in momentum
Answer

C) increase the collision time, reducing the force

F = Delta p/Delta t; same Delta p over a longer time. SLO P-11-B-11 · Application

Physics MCQ · More Momentum and Collisions MCQs · Practise