Here are some examples of contact forces:
* Normal force: This is the force that a surface exerts on an object that is in contact with it. For example, the floor exerts a normal force upward on a book that is sitting on it.
* Friction force: This is the force that opposes the motion of two surfaces in contact with each other. For example, the friction force between your shoes and the ground helps you walk.
* Tension force: This is the force that is transmitted through a string, rope, cable, or similar object when it is pulled tight. For example, the tension force in a rope that is holding a weight is what keeps the weight from falling.
* Applied force: This is a force that is applied directly to an object. For example, pushing a box across the floor is an applied force.
Let me know if you'd like to explore any of these contact forces in more detail!
