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It is said that, during a 30-mi/h collision, a 10-lb child can exert a 300-lb force against a parent's grip. How can such a large force come about?

It is said that, during a 30-mi/h collision, a 10-lb child can exert a 300-lb force against a parent's grip. How can such a large force come about?

Grade:upto college level

2 Answers

Deepak Patra
askIITians Faculty 471 Points
8 years ago
Force is nothing but the rate of change of momentum of the body. Since the 10-lb child moves with 30-mi/h during a collision against the parent grip, therefore the change in momentum of the child will be large. Because the change in momentum of the child is large and the time of collision is small, therefore it signifies that the average impulsive force will relatively large. That is why, during a 30-mi/h collision, a 10-lb child can exert a 300-lb large force against a parent’s grip.
RIZWAN ULLAH
27 Points
7 years ago
According to newton’s 2nd law in terms of momentum F=P/dt,
force is directly proportional to time rate of change of momentum, hence clear that greater the collision(300-mi/h) greater will be the change in momentum and so Force will also greater.

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