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A block of certain mass is placed on a flat surface. A force is applied to move it parallel to the surface. The frictional force fr developed is directly proportional to the : |
mass2 mass $\frac{1}{mass}$ $\frac{1}{mass^2}$ |
mass |
Frictional force : $f_r = \mu N$ As N = mg Thus, $f_r = \mu m g$ $\Rightarrow f_r \propto m$ |
