Question

12. In a crash test, a car runs into a wall and stops. (3)

The momentum of the car before the crash is 22500 kg m/s. The car stops in 0.14 s.
a. Write the initial and final momentum of the car.
b. Calculate the average force on the car during the crash
c. State Newton’s second law of motion

Answer 1

Given

Momentum = 22500 kg m/s

Time taken = 0.14 sec

The force =??

During the car crash the momentum would be transferred , on other hand change in momentum produces Impulse.

Impulse is defined as:

The product of force and time of contact.

Impulse (change in momentum) = force × time

But we have to find force

Force = momentum / time

Force = 22500 / 0.14

Force = 160,714 N

Is the average force occurred during crash.

Hope it helps

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