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23 August, 10:42

A 6000 kg lorry is reversing into a parking space at a speed of 0.5 m/s but collides with a car. The crumple zone of the car stops the lorry in 1.5 seconds. What was the impact force?

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Answers (2)
  1. 23 August, 10:46
    0
    Impact force is 3000Nsec

    Explanation:

    The impact force is called Impulse.

    impulse is the product of the average force acting on a article and the time during which it acts;

    Impulse (I) = Force x Time

    Time = 1.5seconds

    Force = Mass x velocity/time

    Force=6000 x 0.5/1.5

    Force=2000N

    therefore;

    Impulse (I) = 2000 x 1.5

    I=3000Nsec
  2. 23 August, 11:10
    0
    -200 N

    Explanation:

    Force: This can be defined as the product of mass and acceleration The S. I unit is N

    The expression for force is given as

    F = m (v-u) / t ... Equation 1

    Where F = Impact force, m = mass of the lorry, v = Final velocity of the lorry, u = initial velocity of the lorry, t = time

    Given: m = 6000 kg, v = 0 m/s (the lorry was stopped), u = 0.5 m/s, t = 1.5 s

    Substitute into equation 1

    F = 6000 (0-0.5) / 1.5

    F = - 300/1.5

    F = - 200 N.

    Note: The negative sign shows that the impact force act in opposite direction to the initial motion of the lorry
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