Bicycle Definition and 308 Threads

I and few of my pals are making a project. A circular blade woodcutter saw powered by bicycle pedalling for cost effective design for rural people where electricity is a problem... We plan to cut Logs with it...and their cross section can be random... Using a big circular blade. Now...

Homework Statement A person is riding a bicycle at a constant speed v along a straight road and then gradually applies the brakes until the bicycle comes to a stop. Assume that the magnitude of the braking force increases liearly in time acordinto F = bt where b is a constant. The rider &...

hi.. i want to make a automatic gear changing bicycle in which instead of manual changing of gears they change automatically with variation of speed... for this project i need help..if you know any thing about this then please reply...by posting

Homework Statement A bicycle is rolling down a circular hill that has a radius of 9.00m. The angular displacement of the bike is 0.960rad. The radius of each wheel is 0.400m. What is the angle (in radians) through which each tyre rotates ? Notes on question : - wheels are in rolling...

At 6'5", 300 lbs. and old as dirt, I am a walking and rolling testimate to F=ma. This part of my project is difficult for me, because I have never taken a physics class. All the examples I have in books and PF, deal mostly with force moving down a hill. I am trying to compute Watts and Calories...

I am trying to work out the physics used in a micro-controller project. I am having problems with even simple relationships, like F = ma. My answers end up with much larger numbers than, a man on a bicycle should be capable of. This is just a hobby for me, and I haven't taken a physics class...

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i'm a cyclist. Some traffic lights aren't triggered by bicycles. What is the frequency of the AC signal in the coils imbedded in the road to detect cars? Could I build an RLC circuit about the size of my foot that would trigger the light? Knowing the actual frequency is critical to choosing...

I am a cyclist and am starting to think about gear ratios. I have counted teeth on my bike gears (touring) and calculated ratios and the results do not make sense to me. I am left with the beliefe that ratio is not all at work here. It seems that it also has to do with the diameter of the gear...

Homework Statement A bicycle travels 3.2 km due east in 0.10 h, then 4.7 km at 15.0° east of north in 0.14 h, and finally another 3.2 km due east in 0.10 h to reach its destination. The time lost in turning is negligible. What is the average velocity for the entire trip? I need to find the...

just like the title says at what angle can you put the front wheel of a bicycle in relation to the ground and still be able to steer it with moderate percision now when i say angle i mean like a low rider you know the bicycles that have the really long front fork and look cool so basically my...

A person is on a bicycle, there are several situations like the bike is at rest, accelerating,etc. The one I'm having most trouble with is when bike is in constant velocity. For the bike,I have gravity and force of person acting downward, normal force upward, force applied to the right and...

Hey Guys, I'm doing a research project on the bicycle suspension. I would like to include a brief history of the suspension in my report. I am having trouble finding when bicycle suspension was first introduced, and what sort of systems were originally used, who patented it etc. Any help or...

Hey guys, I'm currently doing a project on bicycle suspension response. My query is how is a cyclists weight distributed over the two wheels of the bike. I realize it is going to change depending on the position of the cyclist. I'm just concerned with a "normal" recreational position. I am...

What are the formal principles of math and physics that describe this scenario? Most local laws require bicyclists to ride with (i.e. in the same direction as) traffic. The rationale behind this is that as a car and a bike are traveling in the same direction the car has more time to react to...

Hey all - this is my first post so I mght as well say hi - I'm not very smart, but find everyday physics interesting. I tried to look up Newton's Laws, but I can't figure out: Is a dirt bike or bicycle a good example of the f=ma principle? All the info I found states that the force is...

Can anyone verify that I'm thinking about this situation correctly: among cyclists, there exists a thing called a roller trainer, which allows cyclists (or anyone who wants a workout) to train indoors (eg when it's too cold out). It looks like this...

Homework Statement A well-lubricated bicycle wheel spins a long time before stopping. Suppose a wheel initially rotating at 170 rpm takes 70 s to stop. A)If the angular acceleration is constant, how many revolutions does the wheel make while stopping? Homework Equations i used...

This is my first and probably only question on here. Is it true that the same amount of energy is required to pedal a bicycle from point A to B, no matter the condition of the rider, or the gear ratios used, or the time it takes, as long as every thing else is equal? Weight, rolling...

Homework Statement If you poke a hole in a container full of gas, the gas will start leaking out. In this problem you will make a rough estimate of the rate at which gas escapes through a hole. Your bicycle tire has a slow leak, so that it goes flat within about an hour after being inflate...

Homework Statement A simplified model of a bicycle of mass M has two tires that each comes into contact with the ground at a point. The wheelbase of this bicycle (the distance between the points of contact with the ground) is w, and the center of mass of the bicycle is located midway between...

Bicycle gears, energy, work and power?? hi everyone, let's say you're riding a bicycle, and as you approach a hill, you shift to a lower gear. You pedal at the same rate, however. Does the power increase, decrease or stay the same? An explanation would be helpful. I've been trying to reason...

Trek recently released a belt driven bicycle (instead of chain drive) which led to a discussion among some cycling friends. Which led to discussion of torque, power output, etc. Anyway, I'm trying to compare the chain tension of a motorcycle vs the chain tension of a bicycle. I'm better with...

Hi, I'm a sophomore student at Arizona State University studying Aerospace. I'm currently taking my first physics class ever and I'm loving it. Although there isn't enough calculus, it's mostly formula based, so it's a bit disappointing on that end. Anyways, ever since I started taking the...

Homework Statement A bicycle has wheels with a radius of 0.295 m. It accelerates uniformly and the rate of rotation of its wheels increases form 209 rpm to 265 rpm in a time of 20.7 s. What is the linear acceleration of the bicycle? ω=angular vel. α=angular accel. Homework Equations...

hello to everyone this is my first post on this website but have used it before and found existing posts and answers very helpfull. i am a engineer at bourneouth university studying BSc Computer aided product design, i am currently working on research into a bicycle braking system to improve the...

Hey, Today I assisted to a lecture I didn't understand in Physics I. I've asked to a helper-teacher a question and he made me much more confused. Say I have a rotating bicycle wheel in my hands (my hands don't influence the wheel's rotation) in front of me such that the wheel is in a...

I have a mountain bicycle with a rear spring shock absorber. Recently the shock absorber broke. Until I can purcahse a replacement I was thinking of building a rigid piece of steel to replace the shock, essentially making my bike a non-suspended unit, but still be able to ride it. So here...

A bicycle has wheels of 0.8 m diameter. The bicyclist accelerates from rest with constant acceleration to 22 km/h in 13.7 s. What is the angular acceleration of the wheels? relevant equations: omega = omega initial + alpha * t 22km/h = 6.11m/s I did 6.11m/s * 13.7s = 83.7207 to get the...

Hi, I'm new to the forum so I hope this is the right place to post this, I actually joined to ask this question. I found something in the archive through a google search. The thread can be found at: https://www.physicsforums.com/archive/index.php/t-117265.html Some of the things in there were...

(Complete physics novice here - I know very little about physics, so please excuse any stupid questions!) I was reading the 'Electromagnet' thread, about how movement (preferably rotation) is best for generating power using magnets... What I'm wondering, could you use the rotation of the...

Homework Statement A bicycle pump is a cylinder 20cm long and 3.0cm in diameter. The pump contains air at 21.0C and 1.0atm. If the outlet at the base of the pump is blocked and the handle is pushed in very quickly, compressing the air to half its original volume, how hot does the air in...

Ok so I have this physics problem but for some reason I feel like its a typo or I am missing some informtion, here is the problem A bicycle os moving east beginning at a position of X1=2.0m at T1=0.0s. At the time T2=2.0s find the bicycle's A) position, X2 B) velocity, V2 C) acceleration...

Homework Statement If 2 bicyclists are cycling to the top of the same hill, and one bicyclist is using a gear that is twice as difficult as the other, is there a difference in work and power output between the 2 cyclists?

After riding to work a lot during my internship/REU/whatever thing, I'm back home and want to keep riding anywhere I can. I have an old hybrid mountain/road bike which I really like, but the tires are getting old, especially the back one is getting frayed and I'm getting a bumpy ride for some...

I am doing a lesson on Energy and Momentum and I am asked to write a report that includes sample calculations and examples, a thorough discussion of the principles of physics pertaining to energy and momentum, and apropriate diagrams and notations to demonstrate my understanding between the...

Why is it easier to balance on a bicycle when you are cycling faster rather than slow? Does it have something to do with angular momentum? Thanks.

im pretty sure a bunch of people have done this before. I am wondering if i could modify my own gear bike so that as the wheels spin, they generate electricity and is collected into a battery. then i can turn on a light-weight electric motor so the wheels will either spin on their own or just...

Homework Statement How much work is done by an Olympic triathlete who accelerates herself on her bicycle (combined mass of 105kg) from 5 m/s to 10 m/s? Homework Equations Ek = 1/2mv^2 W = Fapp(d) The Attempt at a Solution Ek = 1/2m[(5 + 10)/2]^2 how do i go about solving this?

[SOLVED] Angular Speed \tau = r * F Homework Statement youve got our bicycle upside-down for repairs with its 66 cm diameter wheel spinning freely at 230 rpm. the mass of the wheel is 1.9 kg and is concentrated mostly at the rim. you hold a wrench against the tire for 3.1s with a normal...

A bicycle has wheels of radius 0.33 m. Each wheel has a rotational inertia of 0.082 kg* m2 about its axle. The total mass of the bicycle including the wheels and the rider is 74 kg. When coasting at constant speed, what fraction of the total kinetic energy of the bicycle (including rider) is the...

[SOLVED] Rotational Kinematics Homework Statement A person is riding a bicycle, and its wheels have an angular velocity of +18.0 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is +13.5 revolutions. (a)...

I'm attempting to write a simple model to describe the angular velocity profile (aka angular acceleration) of a bicycle wheel for different torque vs time profiles. Where this gets complex is that it's not a normal bicycle wheel. It is a normal wheel with weights on the spokes connected to...

[SOLVED] Friction Problem Homework Statement A bicyclist can coast down a 5° hill at a constant 8.0 km/h. Assume the force of friction (air resistance) is proportional to the speed v so that Ffr = cv. (a) Calculate the value of the constant c. ________ kg/s (b) What is the...

Hi all, whilst bored recently I thought wouldn't it be a great idea to have bicycles where the pedals accelerate a massive flywheel and then you release some kind of clutch mechanism to propel the bike forwards. As i thought about it the main problem was what to use for such a flywheel (I was...

It is known that maximum braking occurs when the front brake is applied so hard that the rear wheel is just about to lift off. Skilled cyclists use the front brake alone probably 95% of the time. However, improperly modulating the force applied on the front brake will bring the bike to a...

[SOLVED] Bicycle problem Will the bicycle move forward or backward? We have 2 forces. The friction and the one we act on the wheel through the string. The weight and the normal force have torque equal to zero. torque of the friction = T.r1 torque of the F = F.r2 In the second picture r1>r2...

Hello, I'm doing a big physics lab for my extended essay (IB diploma). I'm exploring two things, where my question is what affects the stability of a bicycle more, velocity or the weight on the bicycle? So for the first variable velocity, i pushed the bicycle in different strengths to alter...

Hi, I’m not an academic and I would like clarification on the following questions. I have searched your forum and the web in general for the answer in order to avoid unnecessarily bothering anyone but was unable to find the answer. Here are my questions. Barring minor influences of...

Homework Statement Tony of mass 55kg coasts on his bi cycle of mass 5 kg at a constant speed of 5m/s carrying a 6kg pack. tony throws his pack forward, in the direction of his motion, at 1 m/s relative to the speed of bicycle just before the throw. Initial momentum of system (tony...