Final answer:
A person pulling a sled is an example of a contact force.
Step-by-step explanation:
A contact force is a force that acts on an object by coming into direct physical contact with it. One example of a contact force is a person pulling a sled. In this case, the person exerts a force on the sled by using their hands or a rope to make direct contact with it.
Learn more about Contact and noncontact forces