Posted by Mota on Friday, January 29, 2010 at 6:17am.
A force of 100N pulls a box of weight 200N along a smooth horizontal surface makes 45(degree) to the floor .
Calculate the work done by the force.
A in moving the box a distance of 25m along the horizontal.
B against gravity.
C against normal force.

physics  Damon, Friday, January 29, 2010 at 7:17am
Horizontal component = 100 cos 45 = 70.7
Work done by moving 25 m = 70.7*25 Joules
THE MOTION IS HORIZONTAL!!!
It does not move in the direction of gravity, thus zero
It likewise does not move in the direction of the normal force > zero
This is a trick question intended to remind you that the work done is force IN THE DIRECTION OF MOTION times distance moved (also of course in the direction of motion)
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