Question

If you push a chair across the floor at a cibstant velocity how does the force of friction compare with the force you exert?

Answer 1

-- "constant velocity" ===> acceleration is 0 .

-- acceleration=0 ===> forces are balanced

-- balanced forces ===> (friction) + (force you exert) = 0

(friction) = -(force you exert)

They have equal magnitude and opposite direction.