posted by monic .
A block of mass 2.50 kg is pushed 2.80 m along a frictionless horizontal table by a constant 12.0 N force directed 25.0° below the horizontal.
(a) Determine the work done by the applied force.
(b) Determine the work done by the normal force exerted by the table.
(c) Determine the work done by the force of gravity.
(d) Determine the work done by the net force on the block.
Forces that are not applied in the direction of movement does no work.
The movement is horizontal.
a. Work = F*d = 12*cos25 * 2.8 = 30.5 J.
12*cos25 = Hor. component of applied force.
b. No work done.
c. No work done.
d. Same as a.