गिव वन एक्टिविटी ऑफ इफेक्ट ऑफ फ्रिक्शन ऑन द नेचर ऑफ सरफेस इन कांटेक्ट
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Explanation:
Friction depends on the nature of the two surfaces. It depends on smoothness or roughness of the two surfaces which are in contact of each other. ...
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