You are testing a new car using crash test dummies. Consider two ways to slow th

Question

You are testing a new car using crash test dummies.
Consider two ways to slow the car from 90 km/h to a complete stop:

Case (1): You let the car slam into a wall, bringing it to a sudden stop. Case (2): You let the car plow into a giant tub of gelatin so that it comes to a gradual halt.

In which case is there a greater impulse of the net force on the car?

A

Case (1)

B

Case (2)

C

The impulse is the same in both cases.

D

Not enough information given to decide

A

Case (1)

B

Case (2)

C

The impulse is the same in both cases.

D

Not enough information given to decide

Explanation / Answer

The impulse is the same in both situations because I=F(delta t). Although the F and delta t would be different in both situations, because the final net force = 0 in both situations, the equations for both situations are proportionate.

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