what is friction ?what is force?
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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
A force is any interaction that, when unopposed, will change the motion of an object. In other words, a force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate.
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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. ... Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other.
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