Ramp races
Build a ramp with a book and a board, then roll a toy car down onto different surfaces: tile, carpet and a towel. Kids measure how far it goes each time. They discover friction for themselves and can explain why the towel stopped the car fastest.
Why it works: the U.S. Department of Education's guide for teaching elementary math recommends moving from hands-on objects to drawings to numbers.
Try it withFriction WorksheetWorksheetsOpen it →























