簡單機械白板動畫

Hand-drawn chart of the six simple machines, each drawn alone in its own soft rounded box, arranged in a tidy grid of three columns and two rows: a lever (a long wooden plank balanced on a small triangle, a box on one end and a hand pushing down on the other end); a pulley (a single grooved wheel hanging from a beam with a rope over it, a hand pulling one end of the rope down and a bucket lifted on the other end); a wheel and axle (a big wooden wheel fixed onto a thin rod, like a well winch with a crank handle); an inclined plane (a smooth wooden ramp with a box being pushed up the slope); a wedge (a steel axe head splitting a log); a screw (one large metal screw with a spiral thread around its shaft). Nothing else in the picture. Coloured pencil and watercolour marker, clean black ink outlines, warm off-white paper, no text.