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1. Explain that gravity is the attraction between two objects. One way to demonstrate this is to drop a solid object such as a pencil to the ground. The free fall of the pencil toward
http://www.ehow.com/how_8515652_explain-gravity-fr...
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Air Friction is the biggest enemy to the efficiency of any vehicle. Whenever one blows air over any surface then the surface experiences a shear force in the same direction trying
http://wiki.answers.com/Q/How_air_friction_affects...
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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction
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Air resists the motion of an object , the faster it is the more fricition there is . Aerodynamics is an independent part of science where people study the effect of air on objects
http://wiki.answers.com/Q/How_air_friction_affects...
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