We wind our watch once a day,what happens to the energy?

Define work. How is work measured? When is work done by a force negative?

$A$ box of mass $10 \, kg$ is placed at point $A$ on a horizontal surface. It is moved to point $B$,which is at a distance of $2 \, m$ from $A$. If the line joining $A$ and $B$ is horizontal,find the work done by the gravitational force on the box. Justify your answer. $(g = 10 \, m s^{-2})$ (in $, J$)

Identify the energy possessed by a rolling stone.

How much work is done by a weight lifter when he holds a weight of $80 \,kg$ on his shoulders for two minutes?

If an electric iron of $1200 \, W$ is used for $30$ minutes everyday, find the electric energy consumed in the month of April. (in $kWh$)