Determine
exerted
Determine the net work done on the block
a.) work done by the applied force:
W=F*d*cos(theta)
where:
F-->Applied Force on the block
d-->distance traveled by the block
theta-->angle between the force and the distance vector, which in this case is the angle between the force vector and the horizontal since the displacement is along the horizontal
we can use this formula since the force was exerted constantly during the process. Inserting the data, we have:
W=16.0N * 2.20m * cos (25 degrees)
W=31.9 N.m pr 31.9 joules
b. Applying the formula: W=F*d*cos(theta)
--> since the normal force is perpendicular to the displacement, the term "cos(theta)" is equal to zero. Think about it, cos(90 degrees) is equal to zero. This means that all forces perpendicular to the displacement does no work at all.
W= 0 N.m or 0 joules
c. Using the same reasoning above, we can conclude the work done by gravity is zero since force due to gravity is perpendicular to the displacement of the block.
d. the work done by the net force is the work done by the invidual forces:
W=(work by applied force) + (work by normal force) + (work by gravity)
so,
W= 31.9 J + 0J + 0J
W=31.9 joules