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force science definition
- Any of various factors that cause a body to change its speed, direction, or shape. Force is a vector quantity, having both magnitude and direction. Contributions of force from different sources can be summed to give the net force at any given point.
- Any of the four natural phenomena involving the interaction between particles of matter. From the strongest to the weakest, the four forces are the strong nuclear force , the electromagnetic force , the weak nuclear force , and gravity .
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