Ask the kids to stand in a big circle, slip a hula hoop onto one child's arm, and have them all join hands. They then must find a way to move the hula hoop all the way around the circle without letting go of each other's hands.
Gears and Pulleys Simple Machines Lessons and activities. NOT Ontario specific, from a homeschooling website. Does however have a few good idea that could be incorporated into the Ontario classroom. www.onteachers.ca is a wonderful website full of lesson plans and ideas for Ontario teachers, by Ontario teachers