The mechanical toy below is based on a cam mechanism. As the toy is pulled along the heads of the ‘ducks’ move up and down.

As the toy is pulled along by a child, the eccentric cam rotates as it is fixed to the axle and the wheels. The heads and connecting rods move up and down as the axle and eccentric cam revolve.

QUESTIONS:

1. Design a toy based on the design seen above. It must operate from cams as it is pulled along by a young child.
2. Add notes simple diagrams that explain how it works, especially the mechanism.
3. What safety precautions have been applied to your design ?