what is a force, Anything that causes an object to move or change direction, who discovered gravity, isaac newton, what is the unit of force, newtons (N), Law 1:, if there are no forces acting on an object, it will not move, Law 2:, when a force acts on an object, it will accelerate. The greater the force, the greater the acceleration, Law 3:, For every action, there is an equal but opposite reaction

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