Bicycle lever problem, there is an addition, how many levers are there on the bicycle, what kind of

If you're not interested, skip this paragraph) [The axle is essentially a lever, right?] As for whether it is a labor-saving lever or a labor-saving lever, it depends on how you use it, such as the steering wheel, you turn the wheel, turn a large circle (cost distance), and the shaft rotates a small point, which is labor-saving; On the other hand, if you turn the axis with your hand, you will draw a large circle (saving distance), so it is a laborious lever. 】

Therefore, the iron disc and the shaft are labor-saving levers, because the distance is wasted, the iron disc rotates very large, and the shaft rotates a small circle;

In the same way with the brake, after you pinch the brake, the brake skin on the wheel only moves a little bit, and the distance you pinch the brake is large, and it takes a distance, so it saves effort.

Handlebars, it should be the same, right? Got it?

Look at the type of leverage, you can:

1. Look at the labor-saving and labor-saving, for example, the bottle driver is a labor-saving lever - because if you don't save labor, you can directly pick it by hand, and why use it;

2. Look at which arm is long and which is short, and the long power arm is labor-saving

First of all, the handlebar is not a labor-saving lever but an equal arm lever, because the power arm and the resistance arm are equal: in addition, because the power arm is large and the resistance arm is a labor-saving lever, you just have to think about what to do with the iron disc handlebar if you don't save effort.

1.The radius of the front iron disc is large, so the force arm is larger. The power arm is larger than the resistance arm, so it is a labor-saving lever.

2。The grip point of the hand is farther away from the fulcrum than the resistance point (the resistance point of the handlebar is the axis of the shaft), and the power arm is larger than the resistance arm, so it is a labor-saving lever.

Because the power arm multiplied by the power = the resistance arm multiplied by the resistance The pedal bar (power arm) is long, so it is a labor-saving lever. The same goes for car brakes. I hope it will be useful to you and I wish you progress in your studies!!

The essence of the axle is a lever that can rotate continuously, the fulcrum is on the axis, and the wheel has the same speed as the axle when it rotates.

On bicycles, there are more axles.

For example: pedal crankset, flywheel shaft, handlebar stem control direction (equivalent to the principle of automobile steering wheel) and other levers: brake hand, V brake or suspension brake caliper, and the above axle can be regarded as a lever

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. Control the lever of the brake brake: the brake handle on the handlebar is a labor-saving lever, and people can press the brake to the steel rim of the wheel with a large pressure with a small force.

Axles on bicycles.

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

b. Bicycle handlebar and fork shaft: form a labor-saving axle (the radius of the handlebar rotation is greater than the radius of the fork shaft).

c. The gear and rear wheel on the rear axle: the component is a laborious axle (the gear radius is less than the radius of the rear wheel).

1.Lever brake: a small force can brake the car;

2.Axle wheels: reduce drag;

3.Bevel screws on bicycles;

4.Transmission chain,

In fact, some mountain bikes nowadays, when they reach the lowest speed, are no longer laborious levers.

The lever principle of bicycle transmission consists of several parts.

Bicycle crankset and pedals. Rotate at the same angular velocity with labor-saving levers.

2.The crankset and flywheel are driven by a chain. Isolinear velocity. Laborious leverage.

3.Flywheels and tires. Rotation at the same angular velocity. Laborious leverage.