Definition
Report | Shivani shukla asks : SOLVE THIS RIDDLE in some situations, i oppose the motion in other situations, i facilitate the motion but, i always oppose the relative motion between two moving surfaces. put some lubricant, and i become small there make the moving surfaces rough i make the movement tough i may be - static, sliding or rolling but whenever two surfaces are in motion i am always there, tell me who i am ! |
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