Roll Definition and 179 Threads

Hello everyone! New here to this forum! My question is...I race a 600 micro sprint here on the east coast. My car has a front and rear panhard bar. The frame mount for the rear is located on the outside of the right frame rail. The frame mount for the front is located on the inside of the...

I apologize if this question has been answered before, but I did not find the explanation that I needed. If a torque is applied to a wheel situated on a frictional surface, what forces cause the wheel to roll? I know that if P is the contact point, the static frictional force counteracts...

Many fighter aircraft have anhedral on their wings - F-104, Dassault Mirage III. What is the effect on control - is it neutral roll stability through 360 and more important, what is the effect on stability - is there a 'notch' effect if there is no dihedral where the aircraft tends to assume...

Homework Statement A ball is released along a horizontal surface with a co-efficient of friction Us at a speed V. Find the time it takes for the ball to start rolling (leave the moment of inertia as I). Homework Equations Quite a few, all of them are stated in my working (that I...

someone help me understand these questions please: 1) Would you pay \$ 2 to play this game? if you throw a one on a balanced die, you receive \$10, otherwise you lose you \$2. a) what are the two possibilities for this game? b) what are the corresponding probabilities associated with these...

If I have (α1,β1,γ1) and (α2,β2,γ2) as two set of rotation angles in radians.Where α is Yaw of α about z axis, β is pitch about y-axis and γ is roll about x axis. My question is when I multiply the two rotation sets what would be the result? Would it be simple addition of angles if I extract the...

When a car turns there is a centripetal force acting at the tyres to get it round the bend. There is also an acceleration of the chassis away from the bend acting at the centre of gravity. These combine to create a torque which causes the chassis to roll about the roll centre. Is this correct...

There are several parts to this effort. Bond paper roll being stretched between 2 paper feeders on wheel bearings Precision positioning of the roll to a coordinate system devised for that roll That is if the paper roll is 35 meters long or 35'000 mm and 914.4mm wide I could choose a point on...

It is basically a question in computer graphics but I guess math sub-forum will suit this question. While rotating a point, why we first apply yaw, then pitch and then roll in that order? Of course if we change the order, final rotation changes but why this specific order works? Some proof or...

Homework Statement A large 16.0 kg roll of paper with radius R=18.0 cm rests against the wall and is held in place by a bracket attached to a rod through the center of the roll. The rod turns without friction in the bracket, and the moment of inertia of the paper and rod about the axis is...

Dear PF, I'm trying to understand slow roll inflation from a layperson view, and I think my current understanding is mistaken. If a bubble of matter is trapped in a local minimum PE state, and begins to roll down a hill to a lower PE state, it strikes me that bubble will expand in size the...

Hello, I am new to Aerodynamics and am having trouble understanding what exactly the roll damping derivative is. The roll damping derivative is a measure of the change in rolling moment coefficient with respect to nondimensional roll rate and is usually negative. Does that mean a glider...

Hello, I'm sorry if this is a dumb question but I am extremely confused and could use some guidance. So consider a cartesian coordinate system with a plane which passes through the origin, and there are vectors of known X,Y,Z components which lie within this plane. The plane(and vectors) are...

I am a bachelors mechanical engineering student with a decent factual knowledge about cars and how they work. But i am a novice with no experience when it comes to design. Now I (along with 3 other guys) have been assigned the task of designing the roll cage of an electric car. I did not get any...

Homework Statement http://puu.sh/5nLnI.png Homework Equations I = mr2 The Attempt at a Solution Moment of inertia: Mass density = mass / area = 2.59 / (π*9.52 - π*7.52) = 0.02424772368 kg / cm2I = (areaA)(density)(radiusA) - (areaB)(density)(radiusB) =...

For ex, say you were rolling a ball down a steep ramp (about 85-90 degrees to horizontal, so almost straight). The ramp is say at least 100m long so there's enough time for the ball to build up velocity, etc. Is it possible for any circumstances to happen where the ball would temporarily...

Hi guys, I'm wondering if I roll a barrel which rolls without slipping down an inclined plane vs. a barrel which only slips down the plane - who will get down faster and how can I show it mathematically ? Thanks

I have done a fair bit of mathematical and 3D modelling of independent automotive suspension systems, and have come to the conclusion that the in pure steady state cornering no matter what the combination of springs, ARB/sway bars, motion ratios or linkage geometry, the roll angle (ignoring the...

I am just wondering (out of curiosity) these past few days what would happen if an object rolls on a frictionless surface. I was thinking if a spherical object is on a free space and is subjected to some force field, I think it would just move laterally to the direction of the field and...

If anyone wants a good laugh please read this article. If you take a shot every time you find an error, you will likely be drunk before you are finished reading. http://news.yahoo.com/heres-rare-closeup-planet-thats-300-million-light-220223737.html;_ylt=Ah6ZqTKb53fikMKpqfgW6PXQtDMD

Homework Statement A cylinder weighing 30lbs is initially at rest on a horizontal surface. There is a spring attached directly below the center, 2ft away from the center point o, pulling to the right horizontally. There is a string attached to the center and to a mass (around a pulley...

Dear Members, I would like to ask if we plot the Roll data of a satellite in degrees vs. the time, and if we take the area under the curve of this roll will give something meaningful? Looking forward for your reply. Regards,

Firstly, I apologise if this is the wrong section, but as far as I could tell this was the most relevant. I have a pair of triplets (p1, y1, r1) and (p2, y2, r2). Each one describes a set of roll, yaw, and pitch rotations in that order, by the angles given by each component in respective order...

Hello ! Firstly, i'd like to say that I have nothing to do with physics - and everything I've learned in school - has been forgotten and I really hope you can help me with a small problem I have .. I bought a roll of clear plastic film (100 m) one like this...

When you pack your luggage, what do you do? Fold clothes? Roll them? Does it matter? Other? (If I could figure out how to make a poll, this would be one :redface: )

Hi, I am trying to find out the roll center of a truck's cab. I went over a similar thread in which jack action explained the concept of roll center. But I am having trouble applying it to something like the cab. It does not really have wheels or a multi-link suspension system like a car...

Homework Statement A player rolls a fair die and receives a number of dollars equal to the number of dots appearing on the face of the die. What is the least a player should expect to pay in order to play the game? Homework Equations I don't really understand the question?? can...

We have a simple, fair, 6 sided dice, and we ask the question - how many times will i have to roll it (on average) to get a 6? I made an experiment (although with only 50 rolls) and i got, that the average was around 5.4.

Homework Statement Two marbles roll off a table at the same moment. One of the marbles has a horizontal speed of 1 inch per second, and the other has a horizontal speed of 4 inches per second. a) Which marble hits the ground first? b) If the table surface is 3 feet from the ground, what...

Maybe I've asked this before but I can't find the topic any more. I'm looking for a way to calculate the outgoing force of a taper roll between two spinning flanges. Staticly this is not so difficult by using the force of the flanges clamping the taper roll and the roll angle. When the...

Homework Statement Roll a fair die until the first time you roll a '5' then stop. Let X be the number of times you rolled the die. What is the probability that X is divisible by 3? Homework Equations E[X] ? The Attempt at a Solution I honestly have no idea how to even approach...

I am currently working for a Touring Car Team . I have modified the front suspension geometry . Made the roll moment lesser and increased the Roll stiffness . Driver complained that the steering effort has increased considerably in the corners . 1.How does increased roll stiffness increase...

Sorry guys, As I understand there is no introduction topic or what so ever so I'll do it here. Don't want to burst in without introducing myself. Hi I'm Andrew from the netherlands and during my websearch for a solution to my problem came across this forum. After finishing my mechanical...

if you roll a quartz ball into another quartz ball... If you roll a quartz ball into a stationary quartz ball what would happen to any electrical energy in the collision? My guess is that the structures would need to be in perfect alignment for any meaningful electrical energy transfer and any...

Homework Statement (I translated this from french) Some n dice are thrown and the sum of all their face values is 117. Estimate n through a confidence interval of 90%. In other words, of all the possible rolls of n dice that sum up to 117, find a range in which n should be located 90%...

Hi guys. I'm trying to calculate the total distance a marble (I'm modeling it as non-deformable solid sphere) will travel along a flat cardboard surface (I'm also assuming the cardboard does not deform). The sphere will initially be propelled by a known external force, it can be assumed that...

Hi guys not sure if this belongs in the homework section, anyway here goes! I'm trying to calculate the total distance a marble (I'm modeling it as non-deformable solid sphere) will travel along a flat cardboard surface (I'm also assuming the cardboard does not deform). The sphere will...

Homework Statement You roll a die, and I roll a die. You win if the number showing on your die is strictly greater than the one on mine. If we play this game five times, what is the chance that you win at least four times? The answer is .1005 [b]2. Related Equations[\b] Binomial The Attempt...

Hello All, on paper machine which I work we have such configurations as is showed on the sketch: http://imageshack.us/photo/my-images/706/systemt.jpg/ a forming fabric (wire) is driven by two rolls, couch roll (with two suctions chamber) and so called FDR (forward drive roll). On the...

This isn't really from my homework or anything like that, just something I was wondering about, but as my first post here I thought I might as well be on the cautious side and post it here. What I was wondering about is the motion of a bottle of water rolling down an incline. for the purpose of...

Hi, I would like to ask if there is any website that explains the processes or the principles of how to install Shaft Roll Mills! It would be so helpful if I can get the step by step installation processes. Are there any Videos or Books. Thank you.

Homework Statement The apparatus in the diagram consists of a solid cylinder of radius 1 cm attached at the center to two disks of radius 2 cm. It is placed on a surface where it can roll, but will not slip. A thread is wound around the central cylinder. When the thread is pulled at the angle...

Can somebody help to validate my formula? I believe the following can be used to calculate anti roll bar resistance; (Roll Bar Rate / (Wheel movement / Relative roll bar pickup movement)^2) * Track Width^2 / 2*Pi / 180 = Roll Bar Resistance My knowledge is limited so other than pondering...

Homework Statement A pure silver Lions fan throws a roll of toilet paper at 11.0 m/s from her seat at Ford's Field during a recent game. How fast is the 0.4 kg roll going when it strikes an opposition player 17.0 m below? Homework Equations 1/2mv^2 = mgh <-- i think. The Attempt at a...

I have an equation taken from a book that when converting from imperial to metric gives me the complete wrong answer when converting back afterwards... it seems simple but I am obviously missing a trick, can anybody help? Imperial Equation Angular Rate / (Lever Length2 x pi /180) = Roll Bar...

Hi, I am trying to calculate weight transfer from the front to rear of a vehicle and have already calculated the total sprung weight to be transfered. I now need to calculate the Roll resistance generated by the springs using the following forumula and this is where the error occurs...

This is even weirder than mammatus clouds. http://news.yahoo.com/giant-tsunami-shape-clouds-roll-across-alabama-sky-192102289.html http://news.yahoo.com/photos/giant-tsunami-shaped-clouds-1324327483-slideshow/

Hi guys. I have a test tomorrow and I am trying to work out the problems on the review sheet, but I can't figure out this one dealing with pdf and cdf. Roll 2 fair dice and call each outcome (i,j) where i,j = 1,2,...6. Define: X= {i+j if i+j ≤ 6 ; abs.value(i-j) otherwise} A) Find...

Why is it that when i cook sausages i can brown them on one side, but, when i turn them over to brown the other side they turn over on there own. I am sure there must be a scientific reason, maybe steam trapped under the skin, any way the only way i can cook them all round is by sticking...

Homework Statement m=6kg r=0.18m Fapp=33N I'm struggling to understand how to answer this question and correlate the linear force applied to rotation without being given the coefficient of friction causing the rotational motion. The question states that a solid sphere of 6kg is...