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**, and length**

*m*_{r}**allowed to pivot freely about its center (or central axis), as shown in the diagram. A small sphere of mass m**

*2x*_{₁}is attached to the left end of the rod, and a small sphere of mass m

_{2}is attached to the right end. The spheres are small enough that they can be considered point particles. The gravitational force acts downward. The magnitude of the acceleration due to gravity is equal to

**g**._{1},m

_{2}, and x. Keep in mind the length of the rod is 2x, not x.

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A seesaw is an enjoyable instrument that is suitable for kids and adults and is comprised of a single rod or plank, which is pivotal around its midpoint. The riders are seated on either side of the rod, and then swing between them.

- In its simplest form, an a-seamsaw with riders could be described as a single rod that is pivotally positioned around its center with mass points positioned around its ends.
- In the moment of inertia in the seesaw is calculated by using the equation
in to calculate Moment of Inertia for the system of objects that are centered around an the axis of rotation. The terms**I=I**_{1}+I_{2}+I_{3}+ ….refer to the moment of inertia that occurs for different elements in the rigid system around the common axis for roatation.*I*_{1}, I_{2},… I_{n}

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