Question

You are holding a bulletin board weighing w = 4.00 N in place against a wall while your friend secures it to the wall. To keep it from slipping, you apply a force P perpendicular to the bulletin board, pressing it directly into the wall. How large must this force be if the coefficient of static friction with the wall is 0.450?

Answer 1

the force must be equal to 8.888 N to keep it from slipping

Step-by-step explanation:

We have given weight of the bulletin board W = mg =4 N

Coefficient of static friction
`\mu =0.450`

When frictional force balance the weight

Then
`\mu N=mg`

So
`0.450* N=4`

`N=(4)/(0.450)=8.888N`

So the force must be equal to 8.888 N to keep it from slipping