The impulse delivered to a body equals
- 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.
Related questions
The SI unit of linear momentum is
The second law can also be written as force equals
A rocket moves forward in the vacuum of space because
The momentum of a body of mass 4 kg moving at 5 m per second is
A cannon is placed on a smooth surface. When it fires a shell, the cannon moves backward. This recoil occurs due to: