(20 12? Drawing: (1) A car accidentally entered the mire, and the driver took a set of pulleys to pull the car out of the mire, as shown in the figure.

(1) As shown in the figure, the pulley block bears the total resistance by four ropes; F= 14f total =14× 8×104n× 0.03 = 600n;

(2) As shown in the figure, the friction force F of object A is horizontally to the right, the gravity G of object B is vertically downward, which acts on the center of gravity, and the pressure F of object A on object B acts on the contact surface.

To see clearly, pressure and gravity are not drawn in a straight line. )