The Physics of Electric Bike Construction
Start writing a post
Sports

# Knowledge of stability

The reason why the bicycle will not tip over during driving is mainly due to the application of the principles of physics. As we all know, for any object rotating at high speed, its direction of rotation will remain unchanged, and the object will not topple over. This is the same reason that a spinning top will not topple over. When we ride a bicycle, we give the bicycle a force in the forward direction to make the wheel rotate, and the wheel can be kept in a balanced state. After adjusting by turning the handlebar, the bicycle can move forward. Once it stops, this Without this balance, the bike will tip over.

# Friction knowledge

1. Friction during starting and driving
When the bicycle starts or runs, driven by the chain, the rear wheel rotates counterclockwise, and the contact between the tire and the ground tends to move backward relative to the ground, so the ground exerts a forward friction force on the rear wheel, which is the bicycle Momentum for forward movement. Under the action of this force, the bicycle as a whole has a tendency to move forward, and the front tire of the bicycle has a tendency to move forward at the contact point with the ground, and the ground produces a backward friction force on the front wheel. Then, the front wheel turns in the same direction as the rear wheel, and the bicycle moves forward. Therefore, the rear wheel is also called the driving wheel, and the front wheel is called the driven wheel. When it rains or snows, the friction force on the ground becomes smaller, and the bicycle is easy to fall, which is commonly referred to as skidding, and this is the reason. The uneven pattern on the tires on the bicycle is to increase the friction.

2. Friction during braking
Friction is not only related to the starting of the bicycle, but also very critical to the braking of the bicycle. If the brake performance is not good, the safety of the cyclist cannot be guaranteed. People pinch the brake handle, so that the brake line drives the brake block and the tire to be close to each other, generating friction, which makes the bicycle slow down and finally stop. The magnitude of friction depends on the magnitude of the pressure and the roughness of the contact surface. The new and the old bicycles, at the same speed, use approximately the same force to pinch the brake handles. The new bicycle brakes faster because the brake pads and tires of the old bicycle are relatively smooth, and the friction generated is very small. In addition, there are uneven patterns on the handlebars, pedals, etc. of the bicycle, which also increase the friction by increasing the roughness of the contact surface.

# Shock absorbing system

The bike has shock absorbers. There are five places in the bicycle that have been subjected to shock absorption: the tripod, the saddle, the headstock and the front and rear tires. The tripod, the saddle, and the headstock use springs for shock absorption, and the body uses tires for shock absorption. When the bicycle vibrates, the entire body becomes deformable, which increases the contact time with the body when the person falls, reduces the force, and improves the comfort. It’s like jumping from a high place to a concrete floor, and the feet will feel pain. If a cushion is laid on the ground, and the person jumps down again, even at the same height, the feeling will not be so severe. The shock absorption not only makes the cyclist feel comfortable, but also reduces the wear and tear of the bicycle.

# Pressure knowledge

1. The load capacity is engraved on the bicycle tire. If the vehicle is too heavy, the tire will be crushed due to too much pressure.

2. The seat cushion is in the shape of a saddle, which can increase the contact area between the seat cushion and the human body to reduce the pressure on the buttocks, so that people will not feel tired when riding a bicycle.

3. In summer, when the tires are fully inflated, the tires will often blow out under strong sunlight. This is because the gas in the tires absorbs heat under the sunlight, the temperature rises, expands when heated, and the pressure increases. Explosive.

4. The function of the valve core: the valve core on the inflatable inner tube acts as a one-way valve, which only allows the gas to enter and prevents the gas from leaking out, which is convenient for air intake and ensures the sealing of the inflatable inner tube.

# Knowledge of simple machines

1. Leverage knowledge
A. The lever that controls 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 for controlling the brake: the brake handle on the handlebar is a labor-saving lever, and people can make the brake press on the steel ring of the wheel with a relatively small force.

2. Axle knowledge
A. Pedals and disc gears on the central shaft: form a labor-saving axle (the radius of the pedals is greater than the radius of the disc gears).
B. Bicycle handlebar and front fork shaft: form a labor-saving axle (the radius of the handlebar rotation is greater than the radius of the front fork shaft).
C, the gear on the rear axle and the rear wheel: form the laborious axle (the radius of the gear is smaller than the radius of the rear wheel).

# Knowledge application of work and mechanical energy

1. According to the principle of work
Effort-saving must cost distance. Therefore, when people go uphill, they often ride the “S-shaped” route for this reason.
2. Mutual conversion of kinetic energy and gravitational potential energy
For example, before riding a bicycle uphill, people often have to step up and pedal a few times to make it easier to go up. This is where kinetic energy is converted into potential energy. When cycling downhill, you don’t need to pedal, and the speed is getting faster and faster. This is the conversion of potential energy into kinetic energy.

# Application of the law of inertia

On a fast-moving bicycle, if the front wheel is suddenly braked, why does the rear wheel jump up? This is because the front wheels stop moving suddenly due to resistance, but the people on the car and the rear wheels do not receive resistance. According to the law of inertia, the people and the rear wheels must keep moving forward, so the rear wheels will jump up. Remember that when going downhill or at high speed, you cannot use the front brake of the bicycle alone to brake, otherwise there will be a rollover accident!

# Optical knowledge

The red tail lights on bicycles cannot emit light by themselves, but they can remind car drivers to pay attention at night. Because the taillight of the bicycle is made of many honeycomb “cells”, and each “cell” is composed of three reflective surfaces that are about 90 degrees. In this way, at night, when the light of the car behind hits the taillight of the bicycle, reflected light will be generated. Because the red color is eye-catching, it can attract the driver’s attention. When people face the car bell, they will see their own image. This is because the shape of the car bell cover is equivalent to a convex mirror, and what people see is the upright and reduced virtual image due to reflection.

Source:https://medium.com/@intheairbike/the-physics-of-electric-bike-construction-10b328192091

4

electric bike

Report this Content
This article has not been reviewed by Odyssey HQ and solely reflects the ideas and opinions of the creator.
Featured

## No Sex And Upstate New York

### A modern-day reincarnation of Carrie Bradshaw's classic column

807
Pinterest

Around the age of 12, when I was deciding whether or not to be gay, Satan appeared on my left shoulder. “Ramsssey,” he said with that telltale lisp. “Come over to our side. We have crazy partiessss.” He made a strong case, bouncing up and down on my shoulder with six-pack abs and form-fitting Calvin Kleins. An angel popped up on the other shoulder and was going to warn me about something, but Satan interrupted- “Shut up, you crusty-ass bitch!’ The angel was pretty crusty. She disappeared, and from that moment forward I was gay.

Unfortunately, 10 years later, I think I have realized what the angel was trying to warn me about. “There will be a lot less options!” she was probably going to say. Yes, I am getting to the point where I am incredibly frustrated that gay men have approximately 1/10 as many potential mates as our Heaven-bound peers.

When I first started college, I obviously tried to find a potential mate among my classmates. But I didn't make any meaningful connections with the handful of other gay men at the school. Also, you know what they say about small liberal arts colleges- the odds are good, but the goods have a lot of chest hair. They aren’t wrong. After one year and three lint rollers, I tried to set my sights beyond Perimeter Road.

Although a world-class destination for those seeking to find white people wearing gauges who feel comfortable using the n-word or girls who speak to horses as if they were people, it turns out Saratoga Springs is not exactly a gay mecca. After quickly running out of options on Tinder and getting tired of watching the little picture of myself sending out waves of digital pheromones into the abyss, I downloaded the gay ‘dating’ app Grindr. My woes would only continue. One of the first people I found on Grindr was named ‘Mr. Big,’ but he wasn’t nearly as romantic as his namesake. A second was a recent transplant from a foreign nation, and after I rejected his advances, he told me that I was the reason why American youth were falling behind the Russians and the Chinese. "You must be stupid," he added. "What kind of grades do you get in school?" “Bs,” I said optimistically. He typed back-“That’s not good at all."

(For the record, I was in the Honors Forum for a semester before taking my talents elsewhere. But they haven’t changed the door code- DM me if you’re interested.)

I spent my summers doing internships in larger cities, where I was lucky enough to date some really cool people. I tried to maintain these relationships after I rowed back up to Alcatraz but it was all in vain.

First there was ‘The Banker’ who I met in NYC. Let me be clear; he had a god-awful personality. He said such abhorrent things as: “I’ll listen to anything but rap.” “I like the Pentatonix version better.” “I like one of the characters on Girls.” Although he had the personality of a manila folder, he had this other endearing quality about him that was impossible to quantify without a ruler. We stayed together for a few months until he thought Miley did a good job hosting the VMAs.

Most recently, I dated a guy who was studying to become a prosthetic doctor. We spent a glorious few weeks together over the summer; I helped him write his papers and in turn he let me make jokes about amputees. I thought we had a real, significant connection, so after returning to school I arranged one weekend to drive and visit him. It was a very long drive- there were 4 empty Mickey D’s Shamrock Shake bottles in the back seat by the time I arrived. Anyone who has tried a cup of St. Patrick’s Sin knows how crazy this is- it takes at least two hours for the neon green chemicals to ooze through your system, burn through your stomach lining and then make a disgraceful exit, and even longer to convince your body to submit to the experience once again. In any case, once I got there, we were having a grand time until he asked me hand him his phone and I saw a notification pop up: “You have a new message on Grindr!’” My heart sunk. We broke up but I still needed a place to sleep. Later that night, wide awake in bed, I re-activated by own Grindr profile. Back to square one.[1]

As I sit here late at night, sipping coffee and chain-smoking while I type this out on my chunky MacBook, I can’t think of any Carrie-isms to sum up my thoughts. I realized before I could love someone else, I needed to love myself? No, I do love myself. It’s not good enough. I realized that I was the problem? Perhaps. I’m too judgmental, I'm quick to right people off, and I think very highly of myself. But I don’t really feel like changing. I guess I'll just have to accept the fact that, as a gay man, I might have to wait a little longer than other people to find 'the one.' I made my bed with Satan and now I must lie in it, alone.

But when my soul mate does show up, he has a lot of fucking explaining to do. Where the fuck were you at, bro?

[1] For those of you who still believe in love, Grindr is set up as a series of squares in a grid, showing people on the app in close proximity to you. When you open your Grindr, your personal picture appears in the first square. Here, our author makes a tremendous pun involving the location of his picture on Grindr and the metaphorical concept of ‘starting from square one.’

Featured

## To The Classes That Follow

### I want you to want to make the most of the years that are prior to Senior year

2065
Senior Year Is Here And I Am So Not Ready For It

I was you not that long ago. I was once an eager freshman, a searching sophomore, and a know-it-all junior. Now? Now I am a risk taker. Not the type that gets you in trouble with your parents, but the type that changes your future. Senior year is exciting. A lot of awesome things come along with being the top-dog of the school, but you, right now, are building the foundation for the next 4 years that you will spend in high school. I know you've heard it all. "Get involved", "You'll regret not going to prom", "You're going to miss this". As redundant as these seem, they're true. Although I am just at the beginning of my senior year, I am realizing how many lasts I am encountering.

Join a club! One of my favorite parts of high school was becoming the president of a community service club at my school. You will intermingle with people you would never see otherwise. This is your time to embrace ALL of these things that high school has to offer, so embrace them. Before you know it you'll be like me- 3 months until I wear my cap and gown and leave. You're going to miss this; don't leave with a single regret

Featured

## The Power Of Prayer Saved My Best Friend's Life

### At the end of the day, there is something out there bigger than all of us, and to me, that is the power of prayer.

3077
Julie Derrer

Imagine this:

Being a 20-year-old college student sitting on a bench, minding your own business, preparing for your second exam of the day. Nothing out of the ordinary, right? The night before, you talked to one of your best friends of eight years about her week at college, three hours away, and about her exciting internship offer.

Again, nothing new.

While looking over your notes, about 10 minutes before the exam is to commence, you're told to pack up your things and go outside to talk.

## "Rylee, Jenna's been in an accident. She's being life-flighted to UW-Wisconsin. You need to call your mom."

On Friday, March 24, 2017, I felt like my world had been turned upside down and stopped spinning. How could this happen to my best friend? I just talked to her last night. The following moments seemed to blur together as I called my mom, speaking through my sobs, hurried home to pack a bag of clothes, and flew down the interstate towards Wisconsin. Over a thousand thoughts went through my mind on that five-hour drive but I just could not wrap my head around the fact I was headed to an ICU in Madison, WI to see my best friend.

In times like this, it would have been all too easy to ask God, why?

Why did you do this?

Why Jenna? What did she do to deserve this?

Why now? She's only 20!

However, instead of taking this route, I chose to pray. I prayed for strength for myself, Jenna, The Preston Family, Tayler, Cody, and my own family. I prayed for the recovery of Jenna and that my best friend would be okay eventually.

I distinctly remember walking out of the hospital that night with a sense of ease, like God had put his hand on my shoulder and said, "Don't worry, I got this."

And he did.

The doctors originally told Jenna's parents it could take up to two years before she might walk or talk again. This accident occurred at the end of March and by her birthday, April 28, Jenna was able to walk into a benefit/birthday party for herself and speak with the all the of attendees.

If she isn't a miracle and true "God Sighting," then I don't know what is.

From witnessing all of this, I cannot begin to stress enough how the power of consistent and heartfelt prayer can work miracles. No matter If you are seeking simple answers, comfort, or guidance, present your troubles to God and let Him take the reins of your life. He wants you to turn to him at all times. I know there have been many, many moments in my life thus far that I have found comfort in putting all of my faith in Him.

I urge everyone to never give up on trusting the Lord wholeheartedly. Although the road ahead is full of uncertainty, if let your faith become untouchable, so that no matter the situation, God will see you through the darkest and bright shining moments of life.

Featured

## Why Driving Drives Me Crazy

### the highways are home

2360

With Halloween quickly approaching, I have been talking to coworkers about what scares us. There are always the obvious things like clowns, spiders, heights, etc. But me? There are a number things I don't like: trusting strangers, being yelled at, being in life or death situations, parallel parking. All of these are included when you get behind the wheel of a car.

As most 16 year olds, I was so excited to get the freedom driving allows. In North Carolina, you're allowed to start Driver's Ed at 14 1/2 years old. Being a January baby, I took the class in July before my 15th birthday. The class goes over the rules and dos and donts of driving that a lot of people never follow (please turn your lights on when it is raining, I don't know why people never follow this rule). The most terrifying part of the class? This horrible video they play of the kids that got drunk and got into an accident. I'm sure nowadays they also have a texting and driving video that I thankfully never have to see. This video however didn't deter me from getting my license at the first chance I could because A) I'm hardheaded and B) When you're a teenager, you feel invincible.

At 23 years old, I feel my invincibility slipping away and my mortality running at me full force. I now think about things I never did before; what would happen if the roller coaster ran off the tracks, what if I fell off this ladder while cleaning the gutters, what if the lawnmower went berserk and the blade went flying off? You see what I mean? I over analyze every little thing now, which includes driving.

Think about it, you are putting your complete trust that all the other drivers on the road know what they're doing at all times. You are hoping that they're not texting, drunk, or sleeping, at least not while they're close to you. One time I seriously saw a girl watching Friends on Netflix while driving (I was a passenger). Don't get me wrong, Friends is a fantastic show but it's Netflix and Chill, not Netflix and Cruise.

In addition to worrying about everyone else, if you make one mistake, you are getting flicked off or cussed at by strangers.

And the worst part about driving? Seeing an accident in front of you and knowing that if you were going a little faster, or if you left a little earlier, it could have been you.

So the next time you get on the road, be a little more cautious, and try to follow the rules because driving is a serious matter and shouldn't be so terrifying.

Sports

## Baseball Spring Training Is A Blast In Arizona

### It's my new favorite time of the year.

2869
Patricia Vicente

Nothing gets me more pumped up than the nice weather and the sights and sounds of the baseball season quickly approaching.

But before we can even get to that point of the 162 games that take up at least six months of our lives, we need to cover all of the bases with what happens beforehand. The monthlong love of spring training.

If you're like me, then you're lucky enough to be in one of the two states that host half of the MLB for this amazing spring season. It's even better when all of the stadiums are within reasonable driving distance from where you're located so you have endless choices for your weekend afternoon.

Even if you're not a baseball fan, it's still a good way for you to even catch a cheap game and spend some time for your friends, which is where the lawn seats will come in handy. Lawn seats are usually located in the outfield on some green grass with a whole field in front of you that usually includes kids running around in hopes of catching a home run ball from the players they idolize.

It's also something that many people don't get to experience, which is why it's so important to take advantage of living in a state that hosts spring training.

I think this is especially important as a student of a university close to these facilities because believe it or not, it kind of becomes a staple for the university and what they have to offer. I know that when I was deciding on what school I would like to attend because I knew it would keep me happy personally and maybe even offer some opportunities professionally.

Personally, I also enjoy it as a baseball fan because I get to go out and see teams and players that I don't get to see as often throughout the regular season.

Spring training is also a really good time to try and get autographs.

With the practices usually being in the morning and with games in the early afternoon, it makes it the perfect day activity whichever day of the week. The accessibility fans get during spring training is unlike any other where you get to watch your favorite players practice and walk past you on their way to another workout during their training in which they might stop by to sign some autographs or something.