In the three figure shown, find acceleration of block and force of friction on it in each case.
Text Solution
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Figure (a) `N = mg = 40N` `mu N = 24N` Since `F lt mu_(s)N` Block will remain stationary and `f = F = 20N` Figure (b) `N = mg = 20 N` `mu_(S) N = 12N` and `mu_(K) N = 8 N` Since, `F gt mu_(S) N`, block will side and kinetic friction `(= 8N)` will act. `a = (F - f)/(m) = (20 - 8)/(2) = 6 m//s^(2)`
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