# An object with a mass of # 8 kg# is on a ramp at an incline of #pi/8 #. 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?

##### 1 Answer

Mar 13, 2018

#### Answer:

#### Explanation:

Here downward component of the weight of the object tends to pull it down along the ramp.

It's value is

Now,given externally

So,static frictional force must act by that amount upwards,such that the net force acting on the object will be zero.

Now,here maximum value of frictional force that can act is

So,we can write,

or,