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A heavy box of mass 20 kg is placed on a horizontal surface . If coefficient of kinetic friction between the box and the horizontal surface . Is 0.25 calculate the force of kinetic friction Also calculate acceleration produced under a force of 98 N applied horizontally ?
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## QuestionPhysicsClass 11

A heavy box of mass 20 kg is placed on a horizontal surface . If coefficient of kinetic friction between the box and the horizontal surface . Is 0.25 calculate the force of kinetic friction Also calculate acceleration produced under a force of 98 N applied horizontally ?

(a) The force on 7 th coin is due to weight of the three coins lying above it Therefore
$${F}={\left({3}{m}\right)}{k}{g}{f}={\left({3}{m}{g}\right)}{N}$$
where g is acceleration due to gravity . This force acts vertically downwards .
(b) The eighth coin is alredy under th