force

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forcesearch for term: The result of an event that produces pressure or causes an object of non-zero mass to accelerate. Everyday examples of force include a person pushing a door open, pulling a rope, or tightening a screw. There are four fundamental forces that cause such actions to happen: gravity, the electromagnetic force, the weak force, and the strong force. Gravity and the electromagnetic force are the two forces with which people are usually familiar; the weak force and the strong force apply to subatomic particles.