Bicycles are a very popular means of transportation and transportation in our country. A lot of mechanical knowledge and applications in measurement are used on it. When measuring the length of a track, a bicycle can be used. For example, the diameter of an ordinary wheel is 0.71 meters or 0.66 meters. Then the length of one revolution is the diameter times the circumference π, which is about 2.23 meters or 2.07 meters.
Then, let the car roll along the track and record the number of turns n. The length of the track is n × 2.23 meters or n × 2.07 meters. Applications of force and motion. Reduce and increase friction. The front axle, center axle and rear axle of the car all use rolling to reduce friction. In order to further reduce friction, people often add lubricants to these parts.
Rugged patterns are engraved in many places to increase friction. Such as car tires, plastic handlebar covers, pedal covers, brake handle covers, etc. Change rolling friction to sliding friction to increase friction.
For example, when braking, the wheels no longer roll but slide on the ground. The friction is greatly increased, so the car can stop quickly. While braking, hold the brake handle firmly with your hand.
Increase the pressure of the brake pads on the steel rim to prevent the wheel from rolling. The shock absorbing effect of the spring. There are many springs installed under the car's seat cushion, using its buffering effect to reduce vibrations. Application of Pressure Knowledge Bicycle tires have a load capacity engraved on them. If the vehicle is overweight, the tire will be crushed due to excessive pressure.
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