Unit 19 ( Gravitational force and frictional force )

In my school, Binus international school serpong, I learnt in science about the gravitational force and frictional force... I learnt that the gravitational force and the frictional force are a force that a gravitational  force is a force that can act at a distance from an object. Gravitational force is the force of attraction between things and then earth. And the frictional force is a force that opposes motion. It is produced when two surfaces rub against each other. so.... that is the gravitational force and the frictional force...