Mechanical clocks and clocks, spring toys are driven by tightening the spring. When the spring is tightened, the spring will produce bending deformation and store a certain elastic potential energy. After release, the elastic potential energy is converted into kinetic energy, which is driven by the transmission device. Toy guns and starting guns and military guns are also used to work with one of the properties of springs.
A spring is installed between the frame and the wheel of the locomotive and the vehicle. The elasticity of the spring is used to slow down the bumping of the vehicle.
When air flows through the holes in the harmonica and accordion, it strikes the reeds and vibrates and makes a sound.