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13 April, 10:50

A car's bumper is designed to withstand a 4.0-km/h (1.1-m/s) collision with an immovable object without damage to the body of the car. The bumper cushions the shock by absorbing the force over a distance. Calculate the magnitude of the average force on a bumper that collapses 0.200 m while bringing a 900.-kg car to rest from an initial speed of 1.1 m/s.

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  1. 13 April, 11:57
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    avriage force F = 2722.5 N

    Explanation:

    For this problem we can use Newton's second law, to calculate the average force and acceleration we can find it by kinematics.

    vf² = v₀² - 2 ax

    The final carriage speed is zero (vf = 0)

    0 = v₀² - 2ax

    a = v₀² / 2x

    a = 1.1² / (2 0.200)

    a = 3.025 m / s²

    a = 3.0 m/s²

    We calculate the average force

    F = ma

    F = 900 3,025

    F = 2722.5 N
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