An object with a mass of $7 kg$ is on a ramp at an incline of $pi/12$ . If the object is being pushed up the ramp with a force of $4 N$ , what is the minimum coefficient of static friction needed for the object to remain put?

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Answer 1 · 2016-03-25T14:53:58

$coefficient of static friction=(mgsinpi/12-4)/(mgcospi/12)$

$we have$
$mgsinpi/12-A*mgcospi/12-4=0$
$mgsinpi/12-4=A*mgcospi/12$
$A=(mgsinpi/12-4)/(mgcospi/12)$

An object with a mass of 7 kg7 kg is on a ramp at an incline of pi/12 pi/12 . If the object is being pushed up the ramp with a force of 4 N 4 N, what is the minimum coefficient of static friction needed for the object to remain put?