Gears and Pulleys – Oct. 2019
https://www.sites.google.com/site/northpreproom2/grade-4-science-and-technology-pulleys-and-gears
Sept. 2019
Gears and Pulleys
What is a pulley?
What are the different kinds of pulley systems?
https://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=643