Question

Define work. Write its formula. What is the SI unit of work? Is it a scalar or a vector quantity?

Answer 1

1. Work is a measure of energy that results by applying a force on the body which displaces the body.
2. Work done is given by the formula $W=Fs\cos \theta$ where F= force applied, s= displacement, $\theta$ = Angle between the force and displacement.
3. The SI unit of work is Joule $\left(J\right)$.
4. Since work is the product of force and displacement, it only has magnitude and has no association with the direction. Hence, it is a scalar quantity.