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Momentum problem
Consider two identical cars (1400 Kg) moving along a road at a speed of 20 m/s. The blue car is stopped by the car's brakes in 25 m while the green car is stopped by a concrete barrier in 1.2 m. The drivers of the two cars are the same mass (70 kg). The driver of the blue car is stopped by the seat belt in the same motion as the car. The driver of the green car is stopped by a seat belt/air bag in 0.150 sec.
Compare the change in momentum of each car. Compare the impulse received in stopping for each driver. Calculate the average force exerted on each driver in stopping. Explain whether a larger mass driver in the green car would experience a larger stopping force relative to their weight if they are stopped in the same time. (i.e. if they had twice the mass would they feel twice the force, or less, or more?) |
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