What are the three contact forces?  

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Contact forces are the forces (as the name suggests) that act when two bodies are in contact with each other. In comparison, non-contact forces work without direct contact between bodies. Some examples of contact forces are frictional forces, tension forces, spring forces, air resistance forces, etc. These forces need contact...

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Contact forces are the forces (as the name suggests) that act when two bodies are in contact with each other. In comparison, non-contact forces work without direct contact between bodies. Some examples of contact forces are frictional forces, tension forces, spring forces, air resistance forces, etc. These forces need contact between bodies and this contact may be continuous or momentary. Think about what happens when a person kicks a ball. The momentary contact, between the person and ball, imparts force to the ball and enables its motion. On the other hand, when we push a cart (while shopping), we are constantly supplying force to it. When we are driving, road and air friction constantly works on the car. 

In comparison, forces such as gravitational forces and electrical forces work at a distance. 

Hope this helps. 

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