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As we know friction is necessary for a body to walk  because according to  Newton 's third law of motion, (every action has an equal and opposite reaction), therefore, we can walk only if the ground we are walking on push our feet back with a force. Friction helps us by providing the necessary reaction force.If we step on banana and try to move the friction between the fett and banana is not sufficient to push the feet to support walk. So we slip off and fall when we step on a banana.
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but if there is a chemicals that workon banana that make us fall
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