Lever Principle in Bicycles 20

Staring down hard when the footrest is turned to the middle position works best.

Because you apply force downward, because it is vertically downward, because the vertical distance from the fulcrum (that is, the axle of the gear next to the pedal) to the force is the power arm, therefore, when the pedal turns to the middle position, the distance from one of the feet to the pedal shaft is the power arm, and it is also the longest power arm, and the other is the resistance arm, because the power arm * power = resistance arm * resistance, therefore, if you want to make the power the least, you should make the power arm the longest, therefore, the effect of staring down hard when the foot pedal turns to the middle position is the best.

F1 is the power arm and L1 is the resistance arm.

After looking at the figure, compare which L1 is larger (that is, the power arm is larger) and you will understand which F1 is smaller, that is, which is the most labor-saving, that is, which has the best effect.

I've just finished this lesson, I'm a junior high school student, and I hope to explain it to you, it's best to make friends.

At the same time, see how serious I am in answering the questions, so give them to me.

The two pedals are in the same straight line (parallel to the ground) horizontally because this is the longest power arm and the least power.

Fulcrum: The axle of the bicycle.

Resistance arm: The distance from the chain of the bicycle to the axis of the bicycle (perpendicular to the line of action of the force) Power arm: The distance from the pedal to the axis of the bicycle.

Actually, two pedals are two levers.

I'm also a junior high school student!

The bicycle handlebar is a labor-saving lever.

There are three types of levers: labor-saving, labor-intensive, and equal-armed. The labor-saving lever means that the power arm is longer than the resistance arm, which means that people can turn the front wheel of the bicycle with very little force to control the direction and balance of the bicycle.

Usually when riding a bicycle, when we encounter the brakes, we can pull the brake brake with a small amount of force to achieve the purpose of braking, which is obviously labor-saving.

Summary. Hello, dear. In addition to the lever principle, the bicycle also has the law of conservation of momentum, which explains the operating principle of the bicycle.

According to the law of conservation of momentum, the friction between the wheels and the ground creates a forward thrust that pushes the wheels forward while the bike is moving. At the same time, the cyclist's foot pedal also creates a backward thrust that pushes the wheels to continue rolling forward. In this way, the bike is able to maintain the forward momentum and achieve driving.

Hello, dear. In addition to the lever principle, the bicycle also has the law of conservation of momentum, which explains the operating principle of the bicycle. According to the law of conservation of momentum, the friction between the wheels and the ground creates a forward thrust that pushes the wheels forward while the bike is moving.

At the same time, the cyclist's pedal pants will also create a backward thrust that pushes the wheels to continue rolling forward. In this way, the bike is able to maintain the forward momentum and achieve driving. Hope mine can help you.

Is there anything else. Is this the best.

Hello, dear. The bicycle also uses the principle of inertia and the principle of energy conversion. Principle of inertia:

1.When a person is riding a bicycle forward, after stopping pedaling the bicycle, the bicycle still moves forward due to its inertia. 2.

When a person rides a bicycle forward, if the emergency brake is made, it is generally necessary to pinch the rear brake first, and then pinch the front brake, or pinch the front and rear together, which is done to prevent the person from flying forward due to inertia. Energy Conversion Principle:1

When a person rides a bicycle downhill, the speed is getting faster and faster due to the fact that the gravitational potential energy of the person and the bicycle is converted into the kinetic energy of the person and the bicycle when going downhill. 2.When people ride a bicycle uphill to pedal a few times, the purpose is to attack the bench to increase the speed, to increase the kinetic energy of people and bicycles, Liang Zen Mausoleum when going uphill kinetic energy into gravitational potential energy, can go higher.

3.There is a spring hung on the carriage of the bicycle, and when it bounces, the elastic potential energy of the spring is converted into kinetic energy, and the carriage springs up automatically. 4.

When the bicycle is riding on uneven roads, the elastic spring that is compressed when the car sits down produces elastic force, and the elastic potential energy of the spring is converted into kinetic energy, and the spring plays a role in shock absorption. Hope mine can help you.

Problem 1: Bicycle handlebars. Schematic diagram of leverage. Thank you.

Question 2: How many levers are there on the bicycle, what are the levers The essence of the wheel axle is a lever that can rotate continuously, the fulcrum is on the axis, and the wheel and the axle have the same speed as the shaft when it rotates.

On bicycles, there are more axles.

For example: foot crankset, flywheel axle, handlebar stem to control direction (equivalent to the principle of a car steering wheel) and so on.

Lever: brake hand, V brake or suspension brake caliper, and the above axle can be regarded as a lever, question 3: which part of the bicycle is a lever and which part is the axle The essence of the axle is a lever that can rotate continuously, the fulcrum is on the axis, and the wheel and the axle have the same speed as the shaft when it rotates.

On bicycles, there are more axles.

For example: foot crankset, flywheel axle, handlebar stem to control direction (equivalent to the principle of a car steering wheel) and so on.

Lever: brake hand, V brake or suspension brake caliper, and the axle above can be regarded as a lever, hehe.

Hope it helps.

Question 4: What is a simple mechanical machine for a bicycle handlebar? Labor-saving or labor-intensive? is the simplest principle of leverage.

The fulcrum is the stand.

Theoretically, the longer the handlebar, the less effort it will take.

In fact, due to the lubrication of the wrist group, it is not very laborious.

Question 5: Is the handlebar of the bicycle a labor-saving lever or a labor-saving lever Is it a labor-saving lever.

Question 6: What is the lever of the car handle and the car pedal The car handle is a labor-saving lever.

Question 7: Is the bicycle handlebar a labor-saving lever or a labor-saving lever. Saves effort, but increases distance.

Handlebar: Axle.

Deformation lever – labor-saving.

Pedal: axle - deformation shouting rubber lever - labor-saving.

Front brake, rear brake: lever - labor-saving.

Rear wheel Zheng side: axle - deformation lever - laborious.

In addition, the handlebar of the bicycle is an equal-arm lever, which rotates and controls the direction of the wax by using different forces with the left and right hands.

There are no strenuous levers on the bike.

Knowledge of levers and axles on bicycles.

Levers on the bike.

a. Lever to control the steering of the front wheel: The handlebar of the bicycle is a labor-saving lever, and people can turn the front wheel of the bicycle with a small force to control the direction of movement of the bicycle and the balance of the bicycle.

b. The lever that controls the brake return to the friend: the brake handle on the handlebar is a labor-saving lever, and people can use a small force to make the Yeshizheng brake press on the steel rim of the wheel with greater pressure.

Axles on bicycles.

a. Pedals and faceplate gears on the central shaft: form a labor-saving axle (the pedal radius is greater than the radius of the faceplate gear).

B. Bicycle handlebar and fork shaft: composed of labor-saving wheel axle (the radius of the handlebar rotation is greater than the radius of the fork shaft).

c. Gears and rear wheels on the rear axle: composed of laborious axle (the gear radius is less than the radius of the rear wheel).

The brake of the bicycle adopts the mechanical principle of a simple lever, and then with the help of a labor-saving lever to achieve the effect of four or two thousand pounds. 1. The braking of the bicycle is carried out by friction; 2. Friction is two objects in contact with each other, when they appear to move relative or have a tendency to relative motion, the force that hinders the relative motion or relative motion tendency will be formed on the contact surface, which is called friction; 3. Friction is divided into static friction and sliding friction, and the friction is divided into two types in order to make it easier to calculate the force. The deceleration of a bicycle depends on the frictional force of the ground acting on the wheels.

The bicycle braking principle and the brakes that hold the rim (or the brake pads that hold the brake disc) convert mechanical energy (braking force) into friction and consume kinetic energy, so that bicycle braking (braking) can be realized. In the natural state of the bicycle, the brakes are on (no brakes), and when the brakes are needed, the brakes are pulled by hand (giving a force) to achieve the brakes.

Bicycle brakes, from drum and rim to disc brakes, have kept pace with the times, but in any case, they can be divided into mechanical or hydraulic and mechanical disc brakes. Mechanically, the brake pads in the caliper are rubbed by the pull of the brake line and clamped to the brake disc, thus creating a braking effect. The key to the benefits of hydraulic brakes and hydraulic brakes is that the brake output force is several times the force exerted by the human arm, which is an intelligent braking force of four or two thousand pounds.