Question

True or false. Zero work is only possible when the angle between the force vector and the displacement vector is exactly 90 degrees.

Answer 1

The formula for the work done by a force is given by:

`W=F\cdot d\cdot\cos (\theta)`

If the angle theta is equal to 90°, the work done is zero, but there may be other ways of having zero work.

For example, if another force with the same magnitude and opposite direction is acting against the main force, the net force is zero and the displacement d will also be zero, this way the work done by the main force is zero.

Therefore the answer is FALSE.