ws10b - Worksheet 10b Impulse Momentum Collisions II...

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Worksheet 10b: Impulse, Momentum, & Collisions II Questions 1. What happens in an auto collision: (a) In a collision, the total change in momentum is zero. That both cars feel about the same change in momentum, hence if you have a bigger car, you’ll tend to have a smaller change in velocity (since p = mv ). (b) The idea here is that regardless of whether or not there’s an airbag, the change in momentum of your head will be the same: Δ p . However, by the momentum- impulse theorem: Δ p = integraltext Fdt F Δ t . Airbags increase the time it takes your head to stop (Δ t ) hence, decreases the force your head feels as it is stopping. 2. Since you cannot change your center of mass, you must do something creative to get to the other side. One thing you can do is throw something: the center of mass will not change, but as the thing you throw goes one way, you will move in the opposite direction. 3. Momentum is not conserved in this case because there is an external force acting on the ball when it bounces: the wall. The wall exerts a normal force on the ball which
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