Posted by **Kendra** on Wednesday, April 2, 2008 at 9:28pm.

A 437.7 N child and a 237.1 N child sit on either end of a 2.5 meter long seesaw.

How far from the 437.7 N child should the pivot be placed to ensure rotational equilibrium? disregard the mass of the seesaw. answer in units of m.

- Physics -
**bobpursley**, Wednesday, April 2, 2008 at 10:35pm
I will be happy to critique your thinking.

The sum of the moments about the piviot has to be zero.

- Physics -
**drwls**, Wednesday, April 2, 2008 at 10:36pm
Let the heavier child be x meters from the fulcrum. The lighter child will be 2.5 - x meters from the fulcrum.

For equilibrium,

437.7 x = 237.1 (2.5 -x)

Solve for x.

674.8 x = 592.75

x = 0.88 m

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