Question

What is meant by a positive work, negative work and zero work?

Answer 1

Work is said to be done when a force applied to an object moves that object.
Positive work - When force and displacement are in the same direction, the work performed on an object is said to be positive work.
Negative work - Negative work is performed if the displacement is opposite to the direction of the Force applied.
Zero work - When force and displacement are perpendicular to each other, or when force or displacement is zero.