Do experiment-Make a movable excavator
1. Non-toxic solid wood
2. 6-color paint with CE certificate
3. Twist the rubber band in the same direction, then loosen your band, the windstick will spin, that the wind
power generated from the movement of windstick will push the car to run forward.
4. Elastic force of rubber band leads to the movement of windstick. Windstick is the giver of force, air is the
acceptor of force. The faster the windstick turns, the bigger the acting force generated, and the greater the
the reactive force will be, then the faster the car will run.
5. The force and reaction between two objects are always equal and opposite. The force cannot leave the object alone. This is the famous third law of Newton.