The center of gravity is the line of gravity action, and the fulcrum is the vertical section of the line of gravity action, that is, the gravity arm l1; A point on the contact surface between the palm and the ground is used as the line of action of the vertical supporting force F, and then the fulcrum is used as the vertical section of the line of action of the supporting force, which is the arm L2 of the supporting force. As shown in the figure:

(2)G=mg=60kg× 10N/kg=600N，

From GLl=FL2, we get

f = l 1gl 2 = 2.0cm×600n 3.0cm = 400n。

Answer: (1) opinion map;

(2) The supporting force of the hand to the ground is about 400 N. 。