Question

Define work. Give its SI and CGS unit. What is the relationship between these units?

Answer 1

Definition of work:

1. The energy required to apply a force to move an object at a particular distance is known as work.
2. Also, work is the product of force and displacement in the direction of the applied force.
3. Thus, $W=Fs\cos \theta$ where $W$ is work done, $F$ is force, $s$ is displacement, $\theta$ is the angle between them.

Units of work:

1. SI unit of work is Joule $\left(J\right)$.
2. CGS unit of work is $erg$.

Relationship between SI and CGS units of work:

1. One joule is equal to ${10}^{7}erg$.
2. Thus, $1J={10}^{7}erg$.