You need to design a cheap and easy-to-ride bike to get it.
Forward distance = wheel circumference × number of turns
Wheel circumference = wheel diameter ×π
Use the knowledge of circle and proportion to solve problems; Understand the speed relationship and internal structure between ordinary bicycles and variable-speed bicycles, and know how many speeds variable-speed bicycles can change.
By solving the common problems about bicycles in life, students' ability to solve practical problems is cultivated.
Experience the basic process of solving problems and understand the close relationship between mathematics and life.
Extended data:
The tire size is printed on the tire wall and can be expressed in two ways, such as 34*7 or 7.50-20. The former is a high-pressure tire and the latter is a low-pressure tire. In addition, there are many signs, such as D for light cars, F for medium-sized cars, G for standard cars and H, L and J for large luxury high-performance cars. If an R is printed on the sidewall, such as 175R 13, the tire is a radial tire with a width of 175mm(6.9 inches). When installed on a wheel with a rim diameter of 13 inch (330mm), the word radial is generally engraved.