- Frictional force: Occurs between two surfaces that are in contact with each other and moving or trying to move past each other. Example: The force of friction that opposes motion when you push a heavy object on the floor.

- Muscle force: The force exerted by muscles in our body to push, pull, lift or move objects. Example: Your muscle exerting force when you lift a book from a table.

- Normal force: When a surface exerts a force that is perpendicular to its own surface and acts directly against another object. Example: The normal force exerted by the ground supporting a chair placed on it.

- Tension: Force exerted by pulling or stretching an object. Example: Tension occurs in a rope when it is pulled taut.

- Applied Force: Any force applied to an object by an external agent, such as a push or a kick. Example: Kicking a soccer ball requires applied force from the player.

- Gravitational Force: Sometimes considered a contact force because it involves direct contact between two objects with mass. Example: Gravitational force between the Earth and an object that gives the object weight.

- Elastic Force: Contact force exerted when an elastic object such as a spring is stretched or compressed. Example: When you pull the elastic band of a slingshot, the band exerts an opposing elastic force.

These are just a few examples of contact forces, and there are certainly other types of forces that fall under this category depending on the specific scenario or system being studied.