# Question #a1106

##### 1 Answer

#### Explanation:

**Key point :** *Try to develop the study of rotational motion parallel to the study of translational motion .*

**In Translatory motion**

If we apply a force ,*say F*, on an object , and the force causes a net displacement of the object , then we say work is done .

In that case we have ,

Now ,

**In rotational motion **

When a torque / moment of force ( analogue of force in rotational motion) causes a body to rotate by an angular displacement

Similar to translational ,

Now ,

P=dW/dt=Τ(dθ/dt)=Τω (

In vector notation

**P=Τ.ω** ( since,