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Materials

• Force sensor

• 1 small screw hook

• 2.3 kg (5-lb) bag of potatoes (or oranges)

• rolling pin

• empty waste paper can

• wooden closet pole (or broom handle without the brush)

• duct tape

• Force sensor

• 1 small pulley

• kite string

• metal hanger

• round plastic food container without lid

• single hole punch

• 100 - 200 pennies

• paper clip

• chair

• duct tape

• Force sensor

• chair

• 1 piece of plywood (80 cm x 20 cm sheet)

• small block of wood

• 1 small screw hook

• string

• meter stick