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Forces
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The sum of all the forces is equal to the mass times the acceleration.
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The force of gravity acting on a two objects is equal to the gravitational constant time the mass of the first object times the mass of the second object divided by the displacement between their centers squared.
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The weight of an object (on earth) is equal to its mass times the acceleration due to gravity.
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The apparent weight of an object (the normal force) is equal to the mass of the object times the acceleration due to gravity (its actual weight) plus its mass times the acceleration it is undergoing.
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The maximum force that static friction can exert on an object is equal to the static friction coefficient times the normal force.
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The kinetic (sliding) frictional force is equal to the coefficient of kinetic friction times the normal force.
If any of the above was unclear, or if you have any comments or suggestions, please E-mail me!
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