Research on the Forward (Backward) Principle of the Twist Car 1, Research Motivation One day, I saw my teacher's two-year-old son playing with the Twist Car. The twisting car has a simple structure, does not need electricity and motors, and can move forward, backward and turn in place. This is a very common toy. Later, I found that a two-year-old child can carry a 65-year-old teacher with little effort and keep wriggling around. Makes us want to know: the forward (backward) principle of the twisted car (Figure.01). 2. Experimental equipment (Figure 02, 03, 04, 05), and arrange the following table: product name, quantity, specification, use, 1 torsion car, net weight 4.7㎏, weight resistance 120㎏ Research topic copy paper/kloc-0. Measure the level of the moving track 1 piece, and check whether the floor is level in two directions. 2 large right-angle plates with scales to measure the size. Four weightlifting discs with a total weight of 32.7㎏ replace the human body weight. Digital weighing scale 1 scale 136. Minimum scale 0.05㎏ Measure the forward force of the wheel 1, weight 3㎏, minimum scale 0. 1㎏ Measure the horizontal tension spring scale 1, weight/. The position of the wheel is indicated by "I", and the direction points to the rotating shaft. 2.R is the distance from the rotating shaft to the handle, and the front wheel can rotate in a circle with R as the radius. 3. If the handle is W-shaped with eyes, the twist car can move forward (Figures 06, 07 and 08). 4. Look with your eyes. 1 1).5. After measurement, the front wheel and the rotating shaft of the twisting car are about a "regular triangle", the position of the vertex is the rotating shaft, and the two bottom angles are the positions of the front wheel. 6. The included angle between the tangential force F and the wheel direction is always 60, regardless of whether the vehicle is twisted forward or backward. 7. When operating the twisting car, people will change their center of gravity by turning the handle.