First slide

Friction on horizontal surface

Question

In this figure what force(F) should be applied on mass m = 5kg so that it just won't slip is (Given that car is moving with constant acceleration a = 5 m/s² and µ = 0.4)

Moderate

A

170N
B

180N
C

250N
D

150N

Solution

$\large ma+N=F\Rightarrow N=F-ma\; \& \mu N=mg$
$\large \mu(F-5\times5)=5\times10$
$\large F=\frac {5\times10\times10}{4}+25=150N$

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