What do Forces come in?

Yes, but not nesicarially equally. "In every interaction, forces always occur in pairs. For example, in walking across the floor you push against the floor, and floor pushes against you. Likewise, the tires of a car push against the road, and the road in turn pushes back in the tires. In swimming you push the water backward, and the water pushes you forward. There is a pair of forces acting in each instance. The forces in these examples depend on friction; a person or a car on ice, by contrast, may not be able to exert the action force against the ice to produce the needed reaction force." -Conceptual Physics by Paul G. Hewitt