What name is given to the force acting on a unit area of an object ?

Which force makes a rolling ball stop on its own?

An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?

Name the quantity whose one of the units is Pascal (Pa)?

What conclusion do you get from the observation that a fountain of water is created at the leaking joint of pipes of the main water supply line?