Contact forces
Force exerted between two objects when they are touching. are A push or a pull. The unit of force is the newton (N). that act between two objects that are physically touching each other. Examples of contact forces include:
Reaction force
An object at rest on a surface experiences Force exerted in the opposite direction to an action force.. For example, a book on a table.
Tension
An object that is being stretched experiences a Pulling force exerted by each end of an object such as a string or rope. force. For example, a cable holding a ceiling lamp.
Friction
Two objects sliding past each other experience A force that opposes or prevents movement and converts kinetic energy into heat. forces. For example, a box sliding down a slope.
Air resistance
An object moving through the air experiences A force of friction produced when an object moves through the air.. For example, a skydiver falling through the air.
When a Force exerted between two objects when they are touching. acts between two objects, both objects experience the same size force, but in opposite directions. This is Newton's Third Law of Motion.