Question

A person is trying to judge whether a picture (mass = 1.10 kg) is properly positioned by temporarily pressing it against a wall. The pressing force is perpendicular to the wall. The coefficient of static friction between the picture and the wall is 0.660. What is the minimum amount of pressing force that must be used?

Answer 1

16.3 N

Step-by-step explanation:

As coefficient depends on the material of wall and state of object. There will be two forces acting.

P = force due to pressure

F= force due to friction

Now F1= μP

and F2= mg ( with which the picture is hanging )

so F1= F2

μP = mg

P= mg/μ

Putting all the values : m= 1.1 kg μ= .660 g=9.8m/s²

P= ( 1.1 × 9.8 ) / .660

P= 16.3 N