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Example 6.10 Walking the plank Adrienne (50 kg) and Bo (90 kg) are playing on a 100 kg rigid plank resting on the supports seen in Figure 6.22E. If Adrienne stands on the left end, can Bo walk all the way to the right end without the plank tipping over? If not, how far can he get past the support on the right? Figure 6.22 Adrienne and Bo on the plank. 20m 30m 4.0 m PREPARE We model the plank as a uniform rigid body with its center of gravity at the center. Figure 6.23E shows the forces acting on the plank. Both supports exert upward forces. W’A and Wy are Adrienne’s and Bo's weights pushing down on the board.