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1.
Design and build a strong arm. There’s no right or wrong way
to build a strong arm, just do whatever you want with the materials.
Remember, you will hang something off your arm 60 cm from the table
edge, so make sure your arm is at least 60 cm long.
2. Attach your strong arm to the edge of the table.
3. Make the testing device by attaching a string
to the plastic cup (or yogurt container) so the cup won’t tip.
4. To test your strong arm, hang the cup from your
arm 60 cm out from the table. One-by-one, add marbles or pennies
to the cup. Once your arm has broken, you can weigh the cup (or
count the marbles or pennies) to see how much it held. (If you don’t
want to break your arm, stop adding weight as soon as there’s
any bending.)
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