A car moving at 8 m/s crashes into a barrier and stops in 0.050 s. There is a 17

Question

A car moving at 8 m/s crashes into a barrier and stops in 0.050 s. There is a 17-kg child in the car. Assume that the child's velocity is changed by the same amount as that of the car, and in the same time period.
(a) What is the impulse needed to stop the child?
N · s

(b) What is the average force on the child?
N

(c) What is the approximate mass of an object whose weight equals the force in part (b)?
kg
(d) Could you lift such a weight with your arm?
Yes
No


(e) Why is it advisable to use a proper restraining seat rather than hold a child on your lap?

Explanation / Answer

impulse = 17*8 = 136Ns b) force = 136 / 0.05 = 2720 N c) 2720 / 9.8 = 277.55kg d) no e) So that the impulse decreases on the child

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