Bicycle is a common means of transportation in our life. There are many mathematical relations or phenomena in bicycle, which can be described from the following aspects:

First, the appearance level.

1.

On the bicycle mechanism, there are several groups of mathematical figures, such as circles, triangles, quadrangles and so on. We can use the radius and diameter of a circle to calculate the circumference, and then measure the distance traveled. Triangles and quadrangles can calculate the perimeter;

2.

Weight; We can use the weight of a single car body to calculate the total number of multiple cars;

3.

Load capacity; Can measure the load range of the bicycle;

4.

The rim is round, which can abstract the position relationship between circle and straight line;

5.

Both rims are circles, so the positional relationship between circles can be abstracted.

6.

The flywheel and the rear ring are concentric circles, which are used to calculate the relationship between the flywheel and the rim.

7.

The toothed plate belongs to the driving wheel and the flywheel belongs to the driven wheel, which can also be used to calculate the speed and the length of the chain.

Second, the use level.

1. When the vehicle is driving, there is an equal relationship of "distance = speed× time";

2. When driving, if it is in a calm wind state, we define it as the vehicle speed. There are two states when there is wind: downwind speed = wind speed+static windmill speed; Upwind speed = static windmill speed-wind speed;

We should observe carefully and realize that there is more mathematics in bicycles. Only through experience, observation and thinking can we gain more comprehensive mathematical knowledge.