The impulse delivered to a body equals
Correct answer: B. its change in momentum
- A. its change in kinetic energy
- B. its change in momentum
- C. the work done on it
- D. its mass times its velocity
Explanation
Impulse is force multiplied by the time for which it acts, and it equals the change in momentum, which is why airbags and crumple zones extend the collision time and so reduce the force on the occupants. A cricketer moving the hands back while catching does the same thing. Change in kinetic energy is related to work rather than to impulse.
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About Linear Momentum
Linear momentum is the vector product of mass and velocity, p = mv, and changes when a net external force acts. Work includes impulse as the change in momentum, conservation of momentum in isolated systems, collisions and explosions, and the distinction between elastic, inelastic and perfectly inelastic collisions.
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