Question #2a88b

1 Answer
Mark C.
Feb 4, 2018

Both of these negate the equation #W = F xx s costheta# because the force is perpendicular to the displacement.

Explanation:

Example 1: carrying a heavy box of cool drinks along the shoreline. There is no work done against gravity, but plenty done against friction (where the angle is zero, so #cos theta = cos 0^@ = 1#)

Example 2: a satellite in a circular orbit. Again force (gravity) providing the centripetal acceleration is perpendicular to the direction of travel.

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