Question

OK SO BASICALLY WORK IS WHEN THERE IS DISPLACEMENT ALONG THE LINE OF FORCE APPLIED BUT WORK IS ALSO DONE WHEN A DISPLACEMENT IS DONE NOT ALONG THE LINE OF FORCE??SO THE FIRST CASE IS THE WORK POSITIVE?

Answer 1

Hello!
Consider this...

Work done equals the product of force applied and the displacement caused, on an object.

Mathematically,

W = FsCosθ

here θ is the angle between the force applied and the displacement.

work done will be zero if (either or),

F = 0

s = 0

or θ = 90, i.e. the direction of the force and displacement are perpendicular to each other.

Work done would be negative if θ > 90 or the force and displacement are in the opposite directions.