Friction is a necessary ---- - evil, What will happen to our bodies if there was no friction? - Our bodies will slip or not move at all, Vehicle tyres and shoes are provided with ------- to increase friction  - grooves, How is friction increased in industrial belts and grinding stones? - They are made rough, Which will have more air friction? A bus or a car? - Bus as it is heavier, Which is greater? Static friction or sliding friction? - Static friction,

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