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Math Help - Kinematics of a Particle

  1. #1
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    Kinematics of a Particle

    4). A particle of mass m kg is at rest on a rough plane inclined at an angle above the horizontal. Force X N acts on the particle up the greatest slope of the plane, as shown in the diagram. Find the magnitude and direction of the frictional force when:

    a). X = 10, m = 1
    b). X = 10, m = 2

    I don't really have any idea what to do. The answer for part 1 is 5.1N, and part 2 is 0.2N. Can you help?

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  2. #2
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    Quote Originally Posted by Viral View Post
    4). A particle of mass m kg is at rest on a rough plane inclined at an angle above the horizontal. Force X N acts on the particle up the greatest slope of the plane, as shown in the diagram. Find the magnitude and direction of the frictional force when:

    a). X = 10, m = 1
    b). X = 10, m = 2

    I don't really have any idea what to do. The answer for part 1 is 5.1N, and part 2 is 0.2N. Can you help?

    the system is in equilibrium ... forces down the incline = force up the incline

    f_s + mg\sin{\theta} = x
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    Thanks, I've got it .
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