Answer to Question #155168 in Mechanical Engineering for Shashi

Question

A roller of radius r = 300 mm and weight 2000 N is to be pulled over a curb of height  150 mm (see Fig.1) by a horizontal force P applied to the end of a string wound tightly  around the circumference of the roller. Find the magnitude of P required to start the roller move over the curb. 

Answer 1

A AP = JOAR - op²

150-(r-15072 300²-(3004502 AP = 260mm 200oN * Take moment arround the point A for the limiting equilibrium. AA -Px (r+ 0p) + 2000x AP = 0 -P? (300 +150) + 2000x260=0 P= 1155.6N