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Knowing how to operate the car is not enough for good driving. You also should understand how the laws of nature can affect your car's behavior. Are you familiar with the effect of gravity on the movement of automobiles? Do you remember how inertia works? Do you know what factors determine the force impact--the force generated when objects meet? Refresh your memory and see how different natural forces can influence your driving performance. There are three basic ways that we control the motion of our cars. They are speed, braking, and steering. Each of these functions is affected by the laws of gravity, centrifugal force, inertia, kinetic energy, and friction. You can not act against these forces, but you can learn what to do if you want to minimize the their effects.