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The center of gravity of an object is defined as the point where all the weight of the object may be considered to act.

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http://www.mrmont.com/games/componentCalculator.html

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Liquid pressure is exerted on the surface of an object in a liquid. This pressure causes upthrust. An object placed in a liquid will begin to sink. As it sinks, the liquid pressure on it increases and so the upthrust increases. For a floating object, the upthrust is equal and opposite to the object’s weight. An object will continue to sink if its weight is greater than the maximum upthrust

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When there is fluid flow past a solid object, the resulting air resistance or water resistance causes a drag force.

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Friction is a force that resists the motion of an object that is in contact with another object or material. It is often called the resistive force of friction.

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Another force that often opposes gravity is known as tension. This force is provided by wires and strings when they hold objects above the earth.

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The normal force acts between any two surfaces in contact, balancing what ever force is pushing the objects together