A large wood circle with a gap is used with a bocce ball. Cut the string while swinging a ball overhead. David and Goliath type slingshot. 1D55.20 Watch the path of sparks flying off a grinding wheel. Show the sparks coming off a grinding wheel.
Sparks fly off a grinding wheel.
Red drops fly off a spinning disc leaving traces tangent to the disc. A turntable is rotated until objects slide or tip over. 1D55.30 rotating disc with erasers Disc 05-15 Place erasers on a disc at various radii and rotate until they fly off. M-151 Three mutually perpendicular discs are rotated about the intersection of two and air is drawn in the poles and expelled at the equator.