Here are some examples of contact forces:

* Normal force: The force exerted by a surface on an object in contact with it, preventing the object from passing through the surface.

* Frictional force: The force that opposes the motion of an object in contact with a surface.

* Tension force: The force exerted by a rope, string, or cable when pulled taut.

* Applied force: A force exerted on an object by a person or another object.

* Air resistance: The force that opposes the motion of an object through the air.

* Spring force: The force exerted by a spring when it is stretched or compressed.

Important Note: While these forces require contact, they can be transmitted to other objects that are not in direct contact. For example, pulling a rope attached to a box will cause the box to move even though you are not touching it directly.