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March 25, 2017

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Please help me I have no idea how to do this problem at all.
Question:A sledge loaded with bricks has a total mass of 17.8 kg and is pulled at constant speed by a rope inclined at 20.8° above the horizontal. The sledge moves a distance of 20.6 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500.
(a) What is the tension in the rope?_ N

(b) How much work is done by the rope on the sledge?__ kJ

(c) What is the mechanical energy lost due to friction?__KJ

  • physic - ,

    you start by breaking up the tension in the rope into a vertical part (which reduces force normal and friction), and a horizontal part.
    Forcenormal=mg-vertical component of tension
    Friction=forcenormal*mu
    so to move, the horizontal component of tension must at least equal fricion.

    You can now find tension from that.
    work on sled? tensioninhorizontal*distance.
    frictionwork? friction*distance

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