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"How Elevators and Pulleys Work"- simple animation

"Simple Machines lesson for 3rd grade unit. From Disney's Bill Nye the Science Guy. Levers, pulleys, and wheels. Also clips from Eureka!, a 1980 animated short series from Toronto. Music by John Williams"

"This video uses working simple machines to demonstrate how to calculate mechanical advantage. Suitable for any school program involving simple machines. Demonstrates pulley systems including a chain block."