The lawn roller has mass M. If the arm BA is held at angle from the

Question:

The lawn roller has mass M. If the arm BA is held at angle θ from the horizontal and the coefficient of rolling resistance for the roller is r, determine the force P needed to push the roller at constant speed. Neglect friction developed at the axle, A, and assume that the resultant force P acting on the handle is applied along arm BA.

Given:

M = 80 kg

θ = 30 deg

a = 250 mm

r = 25 mm