Question

Joule is the SI unit of :

• A. work
• B. energy
• C. both (a) and (b)
• D. none of these.

Answer 1

The correct option is C

both (a) and (b)

Work.

1. Work is the product of the component of the force in the direction of the displacement and the magnitude of this displacement.
2. The S.I unit of work is Joule (J), which is defined as the work done by a force of 1 Newton in moving an object through a distance of 1 meter in the direction of the force.
3. The work can be calculated by,
4. $$\begin{gathered} W=F.d\cos \theta \\ Where, \\ W=Work. \\ F=Force. \\ d=Displacment. \\ \theta =Theanglebetweenforceanddirectionofmotion. \end{gathered}$$
5. Energy can be defined as the ability to do work. The amount of energy possessed by a body is equal to the amount of work it do when its energy is released.
6. The S.I unit of energy is Joule (J). The energy required to do 1 Joule of work is called 1 Joule energy.

Hence Option C is the correct answer.