Forces
Forces can be divided into two categories: contact forces and remote forces. When kicking a football, the force that makes the ball move is a contact force. The force changes the direction and speed of the ball. For a small while, it also slightly changes the ball's shape.
Friction is a type of force that prevents the movement of two touching things. The amount of friction varies.
For example, there is less friction between your shoes and the street that you walk on than there is between ice and a skate's blade,
The attractive force between the Earth and the Moon is an example of a remote force. It keeps the Moon on its orbit around the Earth. The Moon, on the other hand, causes the tidal movement of the Earth's oceans.
The attractive force or gravity between the Sun and the Earth is also an example of a remote force. It keeps the Earth on its orbit around the Sun.
Another example of a remote force is a magnetic force. In the photograph below, two magnets attract one another through a thick deck of cards.
Magnets are an example of a remote force.