Question

why is friction nessasary?

Answer 1

Friction is a force that makes things lie stationery.Though friction gives us some troubles , it is necessary .
FRICTION'S NECESSITY:
    -- without friction we will not be able to stop a moving vehicles.
        -- we will not be able to hold items.
            -- we will not be able to drive.
                 -- we will not be able to write.
∴  friction is necessary in many applications.