1.2 Impact forces

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Impact forces

  • The force on the ball hit by a golfer would be the change in momentum divided by the contact time.
  • If it had an initial velocity, the force would be the final mv - initial mv, divided by the contact time.
  • Car safety features are designed to lengthen the time in which the momentum changes. This reduces the force on the people on the car.
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Rebound impacts

When a ball hits a wall and rebounds, its momentum changes, and providing there are no other forces, it will be equal but in the opposite direction.

Therefore the momentum has a minus sign in front of it.

It is the -mv-mu over time, but the velocities are the same so it is -mu-mu = -2mu. 

(http://latex.codecogs.com/gif.latex?F%3D%5Cfrac%7B-2mu%7D%7Bt%7D)

If the ball doesn't hit straight on, the impulse is (http://latex.codecogs.com/gif.latex?-2mu%5Ccos%20%5Ctheta)

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