a 54 pound crate is pushed across the floor by a 28 pound horizontal force F1. A

Question

a 54 pound crate is pushed across the floor by a 28 pound horizontal force F1. Aside from the pushing force and gravity F2, there is also a 54 pound force F3 exerted upward on the crate and a 22 pound frictional force F4, as shown in the figure. (F1 (28lb) right (>), F2 (54lb) down (v), F3 (54lb) up (^), F4 (22lb) right (<), crate in the middle) What kinds of work do the force F1, F2, F3, F4 do, respectively? A. +, 0,0, - B. -, +, -< + C. +, -, +, - D. +, 0, +, 0 E. +, +, 0,0 F. +, 0,0,0

Explanation / Answer

If force and displacement are in same direction,then work is positive. If they are in opposite directions, work is negative. If they are pendicular to each other, work is zero.

Therefore, A. +,0,0,-.

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