(2008?Huangpu District second model) construction site to carry soil unicycle structure schematic diagram shown in the figure, from the figure can be seen, this unicycle power arm _____

(2) the direction of resistance downward, the fulcrum on the side, so lift the wheelbarrow with the smallest force, it should be the power arm is the longest, the direction of the power is perpendicular to the horizontal direction for the vertical upward;

(3) according to the conditions of equilibrium of the lever: F x L1 = G x L2

∴F=

So the answer is: greater than, vertically upward, 200.