List of top Science Questions on Contact Forces

In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in each case.
1. Squeezing a piece of lemon between the fingers to extract its juice.
2. Taking out paste from a toothpaste tube.
3. A load is suspended from a spring while its other end is on a hook fixed to a wall.
4. An athlete making a high jump to clear the bar at a certain height.

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?

Fill in the blanks in the following statements.
1. To draw water from a well we have to ___ at the rope.
2. A charged body ___ an uncharged body towards it.
3. To move a loaded trolley we have to ___ it.
4. The north pole of a magnet ___ the north pole of another magnet.