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You will need..
30 cm ruler (or longer)
pen
small objects... rubber, peg, coins
kitchen scales blue tac
Set up a table of data and measure the mass of each object..
Place your ruler on the pen so it is balanced, note the position on the scale.
Chose two objects and calculate if one is places 10 cm from the pivot, where must the other be placed?
Test your calculation
Choose another two objects and repeat
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