Anonymous
Anonymous asked in Science & MathematicsPhysics · 4 weeks ago

how to do this friction question?

 An automobile traveling at speed v on a level surface approaches a brick wall

. When the automobile is at a distance d from the wall, the driver

suddenly realizes that he must either brake or turn. If the coefficient of static friction between the tires and the surface is µ, what is the minimum distance that the driver needs to stop (without turning)? What is the minimum distance that the driver needs to   complete a 90◦  turn (without braking)? What is the safest tactic for the driver? (

1 Answer

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  • Anonymous
    4 weeks ago
    Best Answer

    By going straight :

    m/2*V^2 = m*g*μ*d

    mass m cross

    d = V^2/(2*g*μ)

    By turning at 90°

    ac = V^2/d = g*μ

    d = V^2/g*μ

    Braking seems to be the safer tactic

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