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Question
An object of unknown mass is provided to a student. Without using a scale, design an experimental procedure detailing how the magnitude of this mass could be experimentally found. Your explanation must include the concept of torque and all steps should be provided in an orderly sequence. You may include a labeled diagram of your setup to help in your description. Include enough detail so that another student could carry out your procedure.
Get a uniform board, a fulcrum, a known mass, and a ruler.

1. Measure the length of the board, $L$
2. Position the fulcrum in the middle of the board, and the known mass at one end.
3. Find $r_2$ such that the board is balanced.
4. Solve $m_2gr_2=m_1gr_1$ for $m_2$.
Solution Video