Physical aspects of cycling and safety

The lower the center of gravity, the less likely it is to roll over and the safer it is.

1.Parts and components in bicycles with simple mechanics:

The name of the component Simple Machinery Type plays a role.

1) Faucet (handle) axle Easily control the direction (labor-saving).

2) Pedal plate and gear axle are labor-saving.

3) Hand brake lever labor-saving.

4) Big wheels vs. small axles Axles speed up.

5) Big gear and pinion axle to increase the speed.

6) Screws and nuts bevel are labor-saving.

7) The rear wheel axle increases the speed of the vehicle.

8) Chain and flywheel fixed pulley to change the direction of force.

9) Car bell lever labor-saving, reminder.

2.Bicycle with friction:

1) Parts of the bike where there is friction: handlebar gloves; foot pedals; front and rear brakes; front and rear tires; Bearing; chains, etc.

2) Beneficial vs. Harmful Friction on Bikes:

Beneficial rubbing: handlebar gloves; foot pedals; front and rear brakes; front and rear tires, etc.;

Harmful Friction: Bearings; chains, etc.

3) When using bicycles, measures to increase beneficial friction and reduce harmful friction:

The method of increasing the pressure and the roughness of the contact surface is adopted to increase the beneficial friction. For example: handlebar gloves; foot pedals; front and rear brakes and other parts;

Adopt methods such as drip lubricating oil to reduce harmful friction. For example: bearings; chains and other parts.

4) Parts of rolling bearings used on bicycles: large gear center bearing, transmission wheel center bearing, front tire center shaft, rear tire center bearing, etc.

In the first semester of high school, there is a thinking question that is bicycle.

The basic principle of bicycles is to show the static friction used by people when walking in the form of rolling friction. In order to reduce wear and tear, so people feel easier to ride a bicycle than to walk.

A large number of axles are used in the drivetrain. (pedals, rear wheel tooth system) handlebars use levers when cornering. The pattern on the wheels uses friction to increase the bike's grip.

That's all I need to think about for now.

The steering wheel is the axle.

There are patterns on the handlebars and tires to increase friction, and the tires are wide to reduce pressure.

The saddle type is designed to reduce pressure.

The rear taillights are reflected by light.

The chain is an application of the principle of gears.

Tires: 1Filled with gas, elastic, gas at high pressure to keep the tires from deflated.

2.The rear wheel is the driving wheel, and the front wheel is the driven wheel, so most of the person's weight is divided into the rear wheel when the bicycle is designed, which is also the reason why the rear wheel is easy to burst tires.

3.The surface of the tire is made of rubber, and there are textures to increase the friction coefficient of the surface and prevent slipping.

1 The pattern on the tires increases friction.

2 Brake levers are utilized.

3 Forgot.

1 The pattern on the tires increases friction.

2 Brake levers are utilized.

3 Rotation of the handlebar Utilizing the shaft.

The killing measures of the bicycle also correspond to the lever principle.

It is said that no machine can save work, but its bicycle does save work compared to walking. Why is that? Because the bicycle changes the details of the movement, it saves the work caused by the change of the center of gravity of the body when walking, so the bicycle reduces the useless work and improves the efficiency.

This should be an enumeration question, right?

Just name one or two, because there's so much knowledge in it.

Among the 25 components of a bicycle, such as the frame, tires, pedals, brakes, and chains, the basic components are indispensable. Among them, the frame is the skeleton of the bicycle, and it carries the most weight of people and cargo. According to the working characteristics of each component, it can be roughly divided into guide system, drive system and braking system

1. Guidance system: composed of handlebar, front fork, front axle, front wheel and other components. The rider can change the direction of travel and maintain body balance by manipulating the handlebars.

2. Drive (transmission or walking) system: composed of pedals, bottom bracket, crankset, crank, chain, flywheel, rear axle, rear wheel and other components. The pedaling force of the human foot is transmitted by the pedal through the crank, sprocket, chain, flywheel, rear axle and other components, so that the bicycle continues to move forward.

3. Braking system: It is composed of brake components, and the rider can manipulate the brake at any time to slow down and stop the bicycle to ensure driving safety. In addition, for safety and aesthetics, as well as for practicality, it is also equipped with parts such as lights and brackets.

That's all I know about bells, hand brakes, wheels, pedals, the transmission between the pedal and the wheel (the chain), and the part between the wheel and the axle (with lubricant-coated steel balls to reduce wear).