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4 August, 13:17

A dog is pulling a sled by applying a force of 75 newtons on it. The angle of force from the ground is 45°. If the sled moves 15 meters, how much work is done by the dog on the sled?

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  1. 4 August, 16:18
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    Work done = force x distance (where the force is in the direction of the distance travelled)

    We must resolve the force so that it is horizontal to the ground

    force = 75cos45

    Then simply plug into the formula, so:

    work done = 75cos45 x 15 = 795.49 ... Nm = 795 Nm (3 sig. fig.)
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