I assume your school provides “Erector Set” components to build a car with wheels, axles, chassis, and a tower. You need a tower roughly 1.5 meter tall on the car. Suspend a pulley system with a mechanical advantage of 6:1. Wrap 6 meters of string around the rear axle then up through the pully system. Hang masses off the pully system until the car rolls smoothly.
THEN: Test it and trim the string until it just goes 6 meters, starts to lift the masses again and stops.
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I assume your school provides “Erector Set” components to build a car with wheels, axles, chassis, and a tower. You need a tower roughly 1.5 meter tall on the car. Suspend a pulley system with a mechanical advantage of 6:1. Wrap 6 meters of string around the rear axle then up through the pully system. Hang masses off the pully system until the car rolls smoothly.
THEN: Test it and trim the string until it just goes 6 meters, starts to lift the masses again and stops.