Question 1: A car with mass 1500 kg travelling at 80 km/hour brakes slowly until

Question

Question 1: A car with mass 1500 kg travelling at 80 km/hour brakes slowly until it comes to a complete stop in 4.00 seconds. Find the resulting change in momentum. Now assume that the same car was in an accident and goes from 80 km/hour to a complete stop in 250 seconds. Find the resulting change in momentum. Question 2: Consider two object being accelerated by different applied forces. Object 1 is accelerated for a relatively long period of time by a relatively small applied force. Object 2 is accelerated for a relatively short period of time by a relatively strong applied force. The final velocities of the two objects are the same. How does the total impulse delivered to object 1 differ from the total impulse delivered to object 2?

Explanation / Answer

Question 1)

for t = 4 sec

80 km / hour = 80*(1000m)/(3600 s) = 22.22 m/sec

hence change in momentum is dp = final momentum - initial momentum = 0 -(1500*22.22) = 33330 kg m/sec

for t = 0.25 sec also

change in momentum is same

dp = 33330 kg m/sec

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