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Math Help - dynamics of a particle moving in a staright line or plane

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    Exclamation dynamics of a particle moving in a staright line or plane

    Hi, i need help on this as it only gives one variable.

    a boy is tobogganing down a smooth slope inclined at 20degrees to the hortizonal. Find his acceleration, assuming resistances can be neglected.

    Thx.
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    Quote Originally Posted by Sundae View Post
    Hi, i need help on this as it only gives one variable.

    a boy is tobogganing down a smooth slope inclined at 20degrees to the hortizonal. Find his acceleration, assuming resistances can be neglected.

    Thx.
    Pick a point to represent the boy. Resolve along the plane measuring the angle from the vertical which is 70 degrees.

    Resolving along the plane: mgcos(70) = ma

    m will cancel to give a = gcos(70) which should be a number
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