Question

Example 2.14. A roller of radius r = 300 mm and weighing 2000 N is to be pulled over
a curb of height 150 mm, as shown in Fig. 2.18 (a) by applying a horizontal force F applied to
the end of a string wound around the circumference of the roller. Find the magnitude of force F
required to start the roller move over the curb. What is the least pull F through the centre of the
wheel to just turn the roller over the curb?
B
B
F+
F+
1
1
1
O
А
T T
300 mm
D
150 mm
R
2000 N
(b)
(a)
Fig. 2.18​

Answer 1

Answer:

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 T of the If the force P is though the centers Turning the roller over...