Mechanics principle is the theoretic foundation of animated drawing design, especially, gravity, air resistance, groundfriction force and inertia force, elasticity principle are used abroad.
The large diameter super wide quality rubber wheel makes the user's ground effectively protected, and increases the friction of the brake.
大直径超宽优质橡胶车轮使得用户地面得到有效保护的同时，增大了制动的摩擦力。
3
The friction force in the clutch works just like the blocks in the frication section of brake, except that the spring presses on the clutch plate instead of weight pressing the block into the ground.