Forces

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An object that is at rest or moving with constant velocity is in equilibrium. When you resolve in any direction for an object that is in equilibrium, the overall force in that direction is zero. The frictional force always acts in a direction which opposes motion. There is no friction on smooth surfaces. Friction appears when rough surfaces try to move relative to each other. If forces \math-container{F\index{1},F\index{2},........,F\index{n}} act on an object then the resultant force is \math-container{R=F\index{1}+F\index{2}+.......F\index{n}}

Forces

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