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# What is the definition of internal force?

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By definition, internal force is whatever causes an object with mass to accelerate or move. This force is equal to the product of the mass of the object plus its rate of acceleration.

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The first studies of force date back to the third century B.C. and the philosopher Archimedes. Some of his ideas are still found in modern mechanics and physics today. Years later, Aristotle's original findings about force were corrected by the discoveries of Isaac Newton. Isaac Newton's findings depict four fundamental kinds of force: strong, electromagnetic, weak and gravitational. His descriptions have remained largely unchallenged to this day.

## Related Questions

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Calculate the amount of force exerted on a moving object by using the formula f = m * a. You need to know the mass of the object and its acceleration.

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Effort force is the force that moves an object over a distance by overcoming a resistance force. The formula for force is force = mass x acceleration or F = MA and is measured in newtons.

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A mechanical force involves contact with another object. Mechanical forces are distinguished from the four natural forces of electromagnetism, the strong nuclear force, the weak nuclear force and gravity. While each of the four natural forces do not require a physical connection, mechanical forces must travel through a medium.