When do we say that work is done ?

Answer the following : In the figure alongside , a string , attached to a wooden block on a table , is passed over a pully and tied to a weight . On applying a sufficient weight, the block will be seen to move : When can we say that work is done by the applied force ?:

From scientific point of view,when do we say that no work was done?

Study the pictures given below and answer the questions: From scientific point of view, when do we say that no work was done?

When do we say that there is an electric current in a conductor ?

When do you say that body has done no work?

When a body does some work, we can say that work done by the body is

When do we say that a body is retarding or decelerating?

Oral work : When do we say that asn object is electrically neutral?