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14 February, 16:26

Useing newton's third law of motion explain how the motion of an automobile changes when the road surface is slippery

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  1. 14 February, 18:35
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    Refer to the diagrams shown below.

    The normal reaction of the road on the automobile is equal to the weight of the automobile (Newtons 3rd Law).

    That is,

    N = mg (g = 9.8 m/s²)

    When the road surface is dry, the resisting frictional force at the wheel is

    F₁ = μ₁N

    where

    μ₁ = the kinetic coefficient of friction.

    The value of μ₁ is about 0.7 - 0.9 on a dry road.

    When the road is wet, the resisting frictional force is

    F = μ₂N

    where

    μ₂ = the kinetic coefficient of friction on a wet road.

    The value of μ₂ is about 0.1 - 0.4 on a wet road.

    Because μ₂ < μ₁, the automobile tends to slip on a wet road, especially if the tires are worn.
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