A classical mechanics problem by James Guevara
A horizontal force of
is required to maintain a velocity of
for a box of mass
sliding over a rough horizontal surface.
What is the total work done on the box in 1 minute?
The answer is 0.
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1 solution
W t = W f + W f k
W f = F ( s )
W f = 1 5 N ( 2 m / s ) ( 6 0 s ) = 1 8 0 0 J
W f k = F ( s ) c o s 1 8 0
W f k = 1 5 N ( 2 m / s ) ( 6 0 s ) ( − 1 ) = − 1 8 0 0 J
W t = W f + W f k
W t = 0