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View Full Document. Two Forcesâ resultant can be transferred to âOâ along with the moment caused by these forces at âOâ. But this force couple system cannot be replaced by single force at distance âdâ as the force has to be at âOâ as mentioned in problem. This preview has intentionally blurred sections.
Units of Force. Force is a vector, it has both direction and magnitude. The SI unit for force is the newton (N). One newton of force is equal to 1 kg * m/s2. Force is also represented by the symbol F. Force is proportional to acceleration. In calculus terms, force is the derivative of momentum with respect to time. Force and Newton's Laws of Motion. The concept of force was originally defined by Sir Isaac Newton in his three laws of motion. He explained gravity as an attractive force between bodies that possessed mass. However, gravity within Einstein's general relativity doesn't require force.