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

If the displacement is not in the direction of the applied force, how do we calculate the amount of work done?

You have learnt how to calculate the work done on an object when the displacement is in the direction of the applied force. But if the displacement is not in the direction of the applied force, how do we calculate the amount of work done

Give scientific reasons: We feel tired when we do exercise.

From evolution point of view, the tissue which originated first is

Give scientific reasons: You know that as we go higher than the sea level, the boiling point of water decreases. What would be effect on the melting point of solid?

Make a list of the work that we do in our day - to - day life using energy. Which forms of energy do we use to do this work ? Discuss with your friends.

Assertion : the net work done by an electrostatic field on a charge whilr moving it from one point to another is independent of path. Reason: the net work done by an electrostatic force on a charge in it moving along a closed loop is zero.

Do the plants get injured when do we pluck the flowers? How are those wounds healed?

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 : If the block moves forward we can say that it has been displaced . due to the displacement , we sat that the force has done some work . can we measure this work ?: