Motion is when you have an object and it changes its property. It is change of a position. For example a moving car.
What is force
Forces are when someone or something is pushing or pulling it to move. Like for example when I am pushing a bike that is a act of force.
What is the difference between speed and velocity
The difference between Speed and velocity is speed is the measure of the speed on how fast you are going. Then velocity is measuring how fast your going and what direction your going in.
What is friction
Friction is the force when two materials rub against each other and makes friction. An example is when a tire rubs against the road and the car starts to slide.
What is gravity
Gravity is something that is force between any two objects that is what gravity is. One example is in space gravity keeps the planets from bumping into each other. It has to do with forces and motion because it is pulling the objects closer together.