Wheels Definition and 202 Threads

Weird!? About the direction of rotation of wheels Suppose we consider a car moving on rough road in forward direction, wheels rotating clockwise. Since wheels rotate clockwisely they will push road backwards so friction acts forwards i.e. in direction of motion of car.The car will move...

I have fairly basic questions. How do wheels roll on a surface ? As in what should be the ideal Coefficient of Friction between the wheel surface and the ground, for conditions like "no-slips" What I understand is if there is no friction between the wheels and the ground , the wheels would...

Hi, I was just learning about Electric Vehicles, and how they are powered. Let us consider a BEV (Battery Electric Vehicle), and not a hybrid. So we just have the battery powering the drive train and the wheels. The other day a friend of mine asked why the each wheel of the car can't in...

I'm not talking about caked on or burnt on brake dust due to years of neglect. I'm talking my car has 5000 miles on it and came out from an oil change with greasy brake dust all over my alloy wheels. I am not the type to scrub my wheels all weekend, so I want to nip this in the bud before it...

Homework Statement A wheel has bicycle of diameters 109.0 cm. The bicyclist accelerates from rest with constant acceleration to 16.3 km/hr in 16.5 s. What is the angular acceleration of the wheels? Homework Equations w=v/r alpha= w/t The Attempt at a Solution I think I'm...

Hi everyone, I am making a project involving shooting a tennis-sized ball by means of an automated mechanism. I have two horizontal wheels which are at the same height from the ground, and are spinning in opposite directions via motors. There is a space between them, a bit smaller than the...

What is the physics behind magnetorquers and reaction wheels which help in satellite attitude determination and control?

What is the physics behind magnetorquers and reaction wheels which help in satellite attitude determination and control?

Why is it easier to push a load on a wooden crate on wheels when you are nearer the load and the lever is shorter and at a sharp angle compared to pushing a load with the lever lengthened and at a more relaxed angle with your body further away?

Hello! I tried to develop equations of motion of system of wheels, where the first one with radius of r is rotated with some angular velocity v, the center of the second wheel is connected with the first on its perimeter and its plane of rotation is perpendicular to the plane of rotation of...

So I decided to start volunteering for Meals on Wheels. The program where meals are delivered to people's homes who have difficulty one way or the other. It's really nothing more than driving to the home and dropping off the tray of food. Today was my medical exam which I needed to pass to start...

Hi guys, I've been studying rolling recently but I'm having trouble understanding some of the concepts regarding friction and wheels. My first question is, how does friction cause a wheel to roll in general? And if there's no friction, why would the wheel slide instead? In my Physics...

1. if a ball rolling towards east frictional force also acts towards east...why is it so??(i mean to say doesn't frictional force act in opposite to the direction of motion?) 2. if a bicycle is being pedaled, then the frictional force acts in backward direction in the front wheels and in...

Ok the answer in the back of my book says 974 revolutions and a very short hand way to get that is divide the big wheel radius by the small wheel radius to get 3.53 so i can just multiply 3.53 times the 276 rev to get 974 rev. But I tried a long way using the s=rtheta formula b/c on a test I...

What would be the approximate force required on the perimeter of a 30 ft diameter table that weighs 200,000 lbs to move it? The table is sitting on twelve wheels (10" diameter each) that are mounted to ball bearings.

Homework Statement Wheel A of radius ra = 8.9 cm is coupled by belt B to wheel C of radius rc = 30.7 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 8.6 rad/s2. At what time will wheel C reach a rotational speed of 93.0 rev/min, assuming the belt does not...

Homework Statement consider the mechanical system below. Find the equation depicting the system. u is the input force. sorry for the poor picture, I had to draw it on my tablet... http://img685.imageshack.us/img685/1043/ogataprob.png Uploaded with ImageShack.us Homework Equations F=ma...

On pedaling a bicycle along a straight line, the friction act forward on the rear wheel and act backward on the front wheel. If I turn its handlebar so that the front wheel is at a certain angle (say theta) and pedal it in uniform circular motion, what would be the direction of the friction...

Homework Statement The distance between the centers of the wheels of a motorcycle is 155 cm. The center of mass of the motorcycle, including the rider is 88 cm above the ground and halfway between the wheels. Assume that the mass of the wheels is small compared to the body of the motorcycle...

Will switching to alloy wheels (typically 17% lighter than steel) noticibly improve fuel economy? It seems like we should be able to calculate a rough estimate if we had necessary data but i don't. Has anyone been there?

Hello all. I'm trying to find impact forces acting upon a stare climbing robot. I'm using the impulse = change of momentum principle. In order to figure out the change in momentum in a pneumatic wheel bouncing off a stare when it hits it, I need the Coefficient of Restitution of a pneumatic...

Hi to all. Please help me to clarify this situation: There is a 4-wheel cart powered by friction drive using the dc motor. The cart will carry heavy stuffs on the top. what radius of wheels will be able to overcome a 1 cm high and 0.7 cm wide and 14 cm long speed bump(like a thin stick)...

Hello Im doing a physics project and I am trying to come up with an idea for calculating the torque done by an electric motor on the wheels of an RC-car, and the resulting acceleration of the car. We have modified the car with some stronger batteries, and now we are in a dilemma. Each...

I have a engineering question that hopefully you guys find interesting enough to help me with. It works as follows. I have a steadily moving column of water moving at 1.4m per second. I have two water wheels with diameter of 2000mm and 3000mm. Each wheel has 5 flat boards which measure...

A Matter of Wheels and Trains and The Spin of the Earth..!? This question actually comes from a book of mathematical puzzles. The particular question I'm going to state, uses the concept of centrifugal force. And though I'm pretty sure a good mathematician should have a clear understanding of...

When a bicycle is moving on a road, what is the direction on each of its wheels. I think backward on both wheels because the condition of pure rolling is there on the wheels. But then there won't be the necessary forward force that propels the bicycle forward. So what is the exact direction of...

This questions does my head in, someone asked me it a while ago and I don't feel like it was answered right. If you have a car, traveling at 60mph and it used its full tank of fuel. This means on a very long straight road it would cover 60miles on the hour with no fuel left. Now, providing...

Homework Statement What is the coefficient of friction between the road and the wheels of a 1400kg truck accelerating at 2 m/s/s if the force applied by the engine to the wheels is 4000N. Homework Equations Fn = m * g Ff = mu * Fn The Attempt at a Solution I do not know how to...

Hos is the force from a Otto engine (petrol engine) transferred from the engine to the wheels so that the car can move? I would like a short sceintific description, thanks :-)

So I am Googling around trying to figure out how one would go about taking this measurement. I have learned the 'book way' of calculating the power generated by the engine/transmission system of a vehicle; but how does one go about physically measuring it? I am learning about different kinds...

If we were to put two relatively small wheels on the side of a motorcycle would it decrease the performance of the motorcycle?

Does anybody know why you hear the train wheel SCREECH when the train makes a curve?

Now, i am looking for something to get me started with designing wheels for a car. What i want is to make light-weight wheels strong enough to hold around about 200 kg weight. (4-wheels). To give you an idea of what i am looking for, in designing a chassis, we want the frame to be able to...

Acceleration of vehicle when given torque to the wheels... Ok so I am trying to figure out the acceleration of a vehicle that has a maximum of 381ft lbs of torque.With a mass of roughly 1700kg. If I use the formula f=ma, a=f/m and if I convert ft lbs to Nm its roughly 517/1700=.30m^2/s^2...

If car of mass m=1000 kg I want to accelerate to speed v=50 m/s then to me need to calculate friction of car axis on which puted wheels and friction of wheels into ground and air friction. So I suggesting such formula m*a*t+k*m*a*S+c*m*a*S=m*a*t+k*0.5*m*v^2+0.5*c*m*v^2, where a is acceleration...

Hi guys Can u tell me what is the relationship between angular acc. of driveshaft and that of wheel. Remember to include final drive ratio in relation.

hi, this is my question: A farmer has two carts. The carts have the same weight, but one has four narrow wheels and the other has four wide wheels. In rainy weather, which cart sinks less into soft ground, and why? would it be the wide wheels because the weight is spread?

I've got two 14 inch wheels and now I need to attach them so that they rotate on one axle. I also need to put a free hub so that when I stop peddling the wheels keep rotating. How would I do this. I really need to know even if it's a stupid question.

Homework Statement A mechanic jacks up a car to an angle of 10◦ with the horizontal in order to change the front tires. The car is 3.08 m long and has a mass of 1129 kg. Its center of mass is located 1.54 m from the front end. The rear wheels are 0.4 m from the back end. Calculate the...

Homework Statement A roller-coaster vehicle has a mass of 510 kg when fully loaded with passengers (Fig. P7.28). http://www.webassign.net/sf/p7_28.gif (b) What is the maximum speed the vehicle can have at point B in order for gravity to hold it on the track? Homework Equations...

Homework Statement Bike has leaned, passing via corner. Centrifugal forces ( m*(V*V/R)*sin(alpha) ) are trying to upright the bike, gravity forces ( m*g*cos(alpha) ) to lean it further, so the balance lean angle comes tg(alpha) = V*V/R/g, where V is bike speed, R is curve radius, g is...

Homework Statement A 4 kg block rests on 37 degrees inclined plane with wheels, held in place by a light rope which is parallel to the plane. The coefficient of static friction is 0.3 and the coefficient of sliding friction is 0.2. The mass of the inclined plane (with wheels) is 16 kg...

Hello, I believe we have seen that when a car is traveling in high speed and wants to make a sharp turn, the outer wheels actually sort of like lift of the ground right? What is the cause of this? I was thinking that it might have something to do with moments about the inner wheels? Its has...

My question is what causes death wobble? Let me explain more... The vehicle I've experienced this on is a Jeep with a solid front axle, but it can happen on other vehicles. While driving down the road at say 50mph, I hit a small bump, and the steering wheel and tires shake side to side...

Well, I've recently been introduced to the wonderful world of angular momentum and precession motion, and a question popped into mind. Why, exactly, does a wheel rolling across the ground, not topple over even if tipped to one side? I've tried approaching the problem by looking at the angular...

I was thinking about it, and the only thing I could come up with is that it reduces friction with the surface the object is sitting on and perhaps it distributes weight evenly?

Why is breaking with the wheels turning more effective than when the wheel locks up? Is it because there is more friction between the breaks and the disks (or drums) than there is between the road and tyre, or am I missing something.

Wheels[/color][/size] Wheels are the theme this week. Sorry it's late. [SIZE="4"]Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable...

Anyone who's looked at a spinning car wheel or fan notices that sometimes it looks as if the wheel/fan is spinning backwards. I was once told that this is because of the fact that the light shining on it, coming from an electric light source, turns on and off at a certain frequency (~50Hz) and...

Hi, I'm building a simple 2D simulator for mobile robots, and I'd like to be able to determine the translation and rotation of a 2-wheeled simulated robot based on simple kinematics (no forces, friction etc). So, given these: - angular velocity of each wheel (rad/s) - wheel radius (m) -...