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The main forces involved in running are propulsion, braking, and support. Propulsion is the force generated by pushing off the ground, braking is the force that slows you down each time your foot hits the ground, and support is the force that keeps you upright and stable as you move.
physics
No, objects do not have to touch for a force to be involved. Forces, such as gravitational or electromagnetic forces, can act between objects even when they are not in direct contact.
Indirect forces examples include gravitational forces, electromagnetic forces, and nuclear forces. These forces act over a distance without physical contact between the objects involved.
physics
The two forces involved in using a machine are the input force, which is the force applied to the machine, and the output force, which is the force exerted by the machine to do work. The relationship between these forces determines the machine's mechanical advantage.