CLASS 8 CH-FRICTION NOTES
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(i)Friction is the force which resists the relative motion of surfaces. (ii) All types of surface like solid, liquid and air offer the force of friction. (iii) Friction force always applies in the opposite direction of movement. (iv) Friction is applied when two surfaces in contact move relative to each other.
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friction is in every thing. you do anything in the friction.
examples: moving of tires of vehicle.
using pencil in writing etc etc etc
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