# How to Calculate Friction?

If you want to calculate friction you might use the Coulomb Equation. But first make sure you are talking about friction and not inertia, while they are similar, they are two distinct models as friction is an electromagnetic force and inertia is a fundamental force.
How to Calculate Friction
Friction acts between two objects in the manner described by Newton's third law, which states: "For every action there is an equal and opposite reaction." The obvious example is something sliding on the ground. As the object moves against the ground,... More »
Difficulty: Moderate
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 1. Acquire the necessary data. You will need the weight of the object-i.e. the normal force-and the coefficient of friction, representing the amount of friction two surfaces will http://www.ehow.com/how_7477867_calculate-friction...
 1. Calculate the normal force on the object the friction vector is acting. Sometimes the normal force is equal to the weight of the object. Other times, you'll have to take advantage http://www.ehow.com/how_8401081_calculate-friction...
 1. Find the normal force acting on the object moving across the surface. The normal force is the physics term for the force of a surface pushing back on an object that rests on it http://www.ehow.com/how_7529403_calculate-kinetic-...
 1. Measure the distance, in inches, between one of the hinges and the center of the door to obtain the center of gravity distance. 2. Weigh the door, in pounds, on a scale or search http://www.ehow.com/how_7919470_calculate-friction...
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If you want to calculate friction you might use the Coulomb Equation. But first make sure you are talking about friction and not inertia, while they are similar ...
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