The pulley hoist
Inventors (Intermediate), mission I7 Pulleys & Belts, lesson 1 of 6.
Hook
One pulley changes the direction of the pull. What do two pulleys do?
Fair test
Lift a 200 g bucket with 1 pulley, then 2. Read the spring scale each time.
Bonus challenge
How much rope do you pull for each version? Measure it!
The build
Pulley Hoist: A tower with a crank winch and a block-and-tackle. One pulley, then two: the spring scale shows the pull halving.