A child pushes a toy box 4.0m along the fllor with a force of 6.00N directed downward at an angle of 37.0 degrees to the horizontal.
a. How much work does the child do?
b. Would you expect more or less work to be done if the child pulled upward at the same angle?
Wouldn't this depend on the coefficent of friction and the weight of the box? The force of friction opposes the motion.
If one ignores friction (goodness), then the work will be force*distance*cosine37
If the angle is upward, the same expression, that is, if one IGNORES friction. I don't think in the real world that friction plays an insignificant role in this problem.
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