Often expressed as the equation a Fnetm or rearranged to Fnetma the equation is probably the most important equation in all of Mechanics. The principle of conservation of momentum is a direct consequence of Newtons third law of motion. Newton S Three Laws Of Motion Force Mass And Acceleration Light Science Science Notes Newtons Third Law Of Motion The tension is equal to the mass of the object gravitational acceleration for suspended objects which are in equilibrium. . Thinking Proportionally About Newtons Equation. Newtons third law states that for a force applied by an object A on object B object B exerts back an equal force in magnitude but opposite in direction. Newtons law is applied to tension in the final application. Cables and rope are usually used. Putting Newtons 1 st law of motion in simple words a body will not start moving until and unless an external force acts on it. Observe how the force of gravity is dire