A piece of firewood catches fire on rubbing
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When two sticks are rubbed together, the action creates friction, which causes heat. Heat coaxes the wood into a smoldering charcoal, which is fed tinder and dry sticks to become a full-fledged fire. Common tools found in nature that can be used to start a fire are wood and flint.
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Answer:
A piece of firewood catches fire on rubbing because of FRICTION between the two surfaces.
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