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California's Tech Museum of Innovation: engineering-design lab lesson plans, uses available materials and explores electromagnetism, solar energy, force and motion, chemical properties, engineering and earthquakes, genetics. Mostly targeted at middle school levels.

"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."

"How Levers Work" - simple animation that explains how levers work

What makes an airplane fly? How does a spacecraft stay in orbit? Why does a balloon float in the air? What are you waiting for? Come and find out!