What is a force?

- Force is the push or pull of an object in a certain direction.
- The object can slow down, speed up or change direction.
- The object can start or stop a motion.
- The object can move on every object even us.
- All the forces cannot cause an object to change speed or direction.
- Force can cause an object with mass to change its velocity.
- A force that is created when two surfaces move or try to move across each other is called friction.