Final answer:
Contact forces require physical touch between objects, while non-contact forces can act over a distance. The strength of a force and the distance over which it acts affect the changes it causes.
Explanation:
Contact forces are forces that require physical touch or contact between objects to cause a change, such as tension and friction. Non-contact forces do not involve direct touch and can act over a distance, like gravitational and electromagnetic forces.
Two factors affecting the effect of changes caused by forces are the strength of the force, where a stronger force will cause a greater effect, and the distance over which the force acts, as forces can vary based on the distance between objects.
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