Purchase: ... This video resource is designed to provide a basic introduction to gears suitable for grades 4 to 9. Gear rotation, gear ratio, rates of rotation, mechanical advantage and examples of use are included. A second video,
by Bohemian Rat
by Beads Art
by crazyartline
by Yair Sasson Art
by Ornament Designs
by lacefromireland
by Wananas L'Ananas