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# How can friction be reduced?

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Friction can be reduced by adding a lubricant or by smoothing and polishing surfaces, according to the HyperPhysics program at Georgia State University. For some substances, smoothing only reduces friction to a point, after which friction increases with further smoothing.

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Friction is the force that causes resistance between two objects that are moving against each other. Lubricants are substances that reduce friction. These include oils, gels and waxes that create slick surfaces that move easily over one another. Some lubricants are dry. When talcum powder is applied to skin, it forms a dry lubrication that keeps skin surfaces from chafing through friction.

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## Related Questions

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The parallel axis theorem states that the "moment of inertia of any object about an axis through its center of mass is the minimum moment of inertia for an axis in that direction in space," according to HyperPhysics. It is also know as Steiner's theorem.

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The upward force acting upon a falling object is called air resistance, according to Georgia State University. Often referred to as drag in aerodynamics, air resistance works in the opposite direction from which an object is moving.

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Static friction is greater than kinetic friction because of irregularities between the static object and the surface upon which it rests. The irregularities mesh together making it more difficult to start movement than to keep the object in motion.