Static friction Definition and 504 Threads

Homework Statement What is the upward force required to make pipe start to move? There is a fixed point and a 36 inch shaft. The force would be applied 36 inches away to the point. The load is 1700lbs. The end point only needs to come up enough so that the static friction of the pipe is...

Homework Statement During an earthquake, a floor oscillates horizontally in approximately simple harmonic motion. Assume it oscillates at a single frequency with a period of 0.84 s. After the earthquake, you are in charge of examining the video of the floor motion and discover that a box on...

Homework Statement A car is traveling at 50 mi / hr on a horizontal highway a. If the coefficient of static friction between the road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop? b. What is the stopping distance when the surface is dry and μs =...

A crate is in a pickup truck traveling horizontally at 15.0 m/s. The trucks apply the brakes for 28.7 m while stopping with uniform acceleration. What is the coefficient of static friction between the crate and the truck bed if the crate does not slide? I know how to solve for the...

Q: "If a curve with a radius of 85m is properly banked for a car traveling 65km/h, what must be the coefficient of static friction for a car not to skid when traveling at 95km/h?" [PLAIN]http://a4.sphotos.ak.fbcdn.net/hphotos-ak-ash4/215513_1974874979462_1470693940_32310002_1293630_n.jpg...

Hello I do not understand the answer given, i may be thinking too hard? Q: "What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the road is 0.90?" A:"The static frictional force is the accelerating force, and so F(friction) =...

I'm doing a lab for my technical dynamics class and that lab is to determine the coefficient of static friction between a metal washer and both metal and rubber surfaces. I did the experiment using 3 washers set at different distances from the center of the turntable as instructed, and...

I was left bewildered by a question our teacher left us to think about over the next week. He asked us how we can demonstrate static friction doing positive work, using a pen and a sheet of paper. Can anyone tell me how I can do this, and why this is so?

Homework Statement a) If the co efficent of static friction between a table and a uniform massive rope is Us, what fraction of the rope can hang over the edge of the table without the rope sliding? Homework Equations F=mg The Attempt at a Solution The largest fraction of the...

Homework Statement A car is traveling at 30m/s around a bend of radius 70m. What coefficient of static friction between the tires and the road is required to ensure the car will not slip? Homework Equations The Attempt at a Solution I know that the centripetal acceleration is...

Homework Statement A 5.0 kg mass is held against a wall with which it has a coefficient of static friction of 0.85. What is the minimum horizontal force required to hold the mass against the wall ? The teacher said answer is 58 N .. i can't get to that answer.. Homework Equations...

Homework Statement If the coefficient of static friction between an table and a uniform massive rope is [tex]\mu[s] what fraction of the rope can hang over the edge of the table without the rope sliding? b]2. Homework Equations [/b] The Attempt at a Solution Frictional force...

Static Friction Problem -- Physics I Homework Statement I've attached the problem, in order to avoid any confusion.2. The attempt at a solution I tried to use F=ma for both of the masses, however, I need the acceleration along the x which I'm having diffuclity finding. Either that, or I...

i need to know how to study the static friction coefficent like what happens if it exceeds its limit what happens why the least value of static coefficent is static

Homework Statement What's the max weight, P, you can hang on the hanger's arm, when the hanger arm is attached to a pole with the help of two friction forces at point A and B. http://img543.imageshack.us/img543/8466/maxwqeight.jpg Homework Equations Static friction coeffecient =...

Homework Statement in a demonstration designed to determine the coefficient of friction for a book on a wooden plank, one end of the plank was raised until the book on it began to slide. if sliding commenced when the plank was at an agle of 37 degrees above the horizontal, what was the...

Homework Statement To measure the static friction coefficient between a 1.64-kg block and a vertical wall, the setup shown in the drawing below is used. (The dots are only there because spaces didn't work) ......| ......|W SPRING----->(Block)|A ......|L ......|L ......| A spring (spring...

Homework Statement A crate resting on a rough plane is found to be on the verge of sliding when the plane is inclined at an angle of 40 degrees to the horizontal. Calculate the coefficient of static friction between the crate and plane. [ Homework Equations f(s)<_(Mu(s))N <_ is meant to...

Homework Statement There is a roller coaster cart with passengers sitting on the top of a 23 degree incline. The ride is about to start. The combined mass of the cart and passengers is 363kg. a) What would the free body diagram look like? b) How do you solve for normal force? c) How do...

Homework Statement A car of mass 1.1 x 103 kg negotiates a level curve at a constant speed of 22 m/s, The curve has a radius of 85 m. Determine the coefficient of static friction that allows the car to make the turn. Homework Equations mv^2/r = uFg and not sure what for static friction...

So I've been pondering on this question for quite a while and I'm a little stumped. It's not a homework problem; just a problem I came across yahoo answers a week ago. Basically it's a true or false question: Homework Statement If a highway curve is properly banked and posted at 45 mph, it...

Homework Statement A car traveling on a flat circular track of radius 5m accelerates uniformly from rest with a tangential acceleration of 1.7m/s^2. The car makes it 0.2 of the way around the track before skidding off. Acceleration of gravity=9.8m/s^s. What is the coefficient of static...

A car with a weight of 10,500 N rounds a curve with a radius of 102 m on a level road at 44.0 m/s. The tires are at the point of starting to skid at this speed. a. What is the maximum force of static friction? b. What is the coefficient of static friction between the tires and the road?

Homework Statement A crate sits unrestrained on the back of a flatbed truck traveling along a straight road at a speed of 80km/hr. The driver applies a constant braking force and comes to a stop in a distance of 22m. What is the minimum coefficient of static friction between the crate and the...

I have this question that I am working on, I think I know the formula to figure it out, but I am not too sure. I just need some help explaining how to do it, what to figure out first. The rest I can obviously do myself. Thank you so much! A 1450 kg car is towing a trailer of a mass of 454 kg...

Homework Statement Two blocks with the same mass m = 1 kg are stationary on two slopes with slope angles of 30 and 45 degrees. Both blocks are connected with the larger one in the middle via two pulleys. Made a sketch to make it clearer...

Homework Statement The first part is a donkey is pulling a cart with zero acceleration and I've found the coefficient of kinetic friction in the bearings and the wheel, and the coefficient of static friction of the donkey in the ground. Part two I'm having problems with- This time, a the...

Homework Statement A cat sits on a merry go round at a radius of 4.0m from the center. The ride makes one complete rotation every 6.3 seconds. What is the least coefficient of static friction to keep the cat in place? Homework Equations Circumference = 2Pi*r V=d/t a=v^2/r The...

Homework Statement An un-tethered block sits on a flatbed truck as it accelerates up an incline that makes an angle of 15° with respect to the horizontal. If the truck speeds up at a rate less than 2.10 m/s2, the block remains on the truck. If the truck speeds up at a rate equal to or greater...

Homework Statement In the figure a fastidious worker pushes directly along the handle of a mop with a force F. (Note: For picture, imagine a worker standing in the second quadrant pushing the mop head into the origin) The handle is at an angle θ = 23.58° with the vertical, and 0.30 and 0.22...

Homework Statement A crate of weight Fg is pushed by a force P on a horizontal floor. (a) If the coefficient of static friction is us and P is directed at angle theta below the horizontal, show that the minimum value of P that will move the crate is given by P = ( us*Fg*sec(theta)) / (1...

Homework Statement Suppose the coefficient of static friction between the road and the tires on a car is .60 and the car has no negative lift. What speed will put the car on the verge of sliding as it rounds a level curve 30.5m in radius. Homework Equations A=V^2/R F=MV^2/R The...

Homework Statement The floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.25 with the floor. If the train is initially moving at a speed of 48 km/h, in how short a distance can the train be stopped at constant acceleration without causing the...

Homework Statement The three identical boxes shown in the figure remain at rest on a rough, horizontal surface, even though they are acted on by two different forces, F1 and F2. All of the forces labeled F1 have the same magnitude; all of the forces labeled F2are identical to one another...

max \mus is always larger than \muk. i think it's proven experimentally, but why exactly is this so?

Homework Statement Block A, with mass mA, is initially at rest on a horizontal floor. Block B, with mass mB, is initially at rest on the horizontal top surface of A. The coefficient of static friction between the two blocks is μs. Block A is pulled with a horizontal force. It begins to slide...

Hi, I place an object on a rough surface. It is clear that the static friction will increase as you increase the elevation of the surface since there is a bigger component of weight acting down the plane surface. But will the max static friction -i.e. friction at the verge of slipping...

when you take 2 phone books , and inter-lay them page by page , so it makes them hard to pull apart . is this because it is like sliding a block of wood on a table just now you have like 1000 surfaces sliding on each other , is that what is going on .

Homework Statement A 100kg box is placed on a ramp. As part of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 15 degrees. What is the coefficient of static friction between the box and the ramp? Homework Equations Fn = mg-Fsin15 The...

Homework Statement Need to calculate the error of coefficient of static friction in a lab where: µs = tan(theta)s They say to use the general theory of errors? Homework Equations delta[tan(theta)] = [1/cos(theta)]^2 (delta)(theta) The Attempt at a Solution Do I just plug in my...

Homework Statement There is a 40 Newton beam being held by a rope. The rope is attached at the top of the beam and the ground making a 25 degree angle at the top of the beam. There is a force applied to the beam with 200 Newtons in the positive x direction. Find the tension and static...

A car, traveling at speed v, can safely negotiate an unbanked curve with a 50.0-m radius when the coefficient of friction between the tires and the road is 0.8. How much bank would a curve with the same radius require if the car is to safely go around it at the same speed, v, without relying on...

For a personal project, I am analysing the physics in the Source video game engine and comparing it with real life. I have set up in the engine a platform which increases in inclination from 0 to around 70 degrees. On this platform there are four, equally weighted cubes each with a...

Homework Statement A cube of side l rests on a rough floor. It is subjected to a steady horizontal pull F, exerted a distance h above the floor as shown below. As F increases, the block will either begin to slide, or begin to tip over and thus rotate. Determine the coefficient of static...

Homework Statement The coefficient of static friction between a small coin and a turntable is 0.30. The turntable rotates at 33.3 RPM. What is the max distance from the center of the turntable at which the coin will not slide? Homework Equations Fs max =μs (FN) V = ω (r) a=(V^2)...

Hey guys first time posting and I have a really frustrating question. Is there static friction when the force of gravity is pulling an object straight against a surface. I believe that there is none because (i don't know if I'm wording this right) the friction is equal to the normal of the...

Homework Statement On a box (of mass "m"), force "F" is applied at "theta" degree angle above the horizontal. The box has static friction coefficient of "u." When this force is applied, and the box remains stationary, what expression describes the frictional force? Homework Equations...

Homework Statement For a system (with frictionless pulley) Mewsubk = .25 and the system is initially at rest. The mass of block 1 is 16 kg and the mass of block 2 is 12 kg. Determine the minimum coefficient of static friction needed to prevent any movement. Homework Equations F=ma...

Homework Statement Suppose I have a brick that's sitting at the edge of a disc that is rotating clockwise with uniform circular motion. I what direction(s) are the forces of static friction acting? Homework Equations a = v^2/r The Attempt at a Solution I know that a...

Homework Statement If a curve with a radius of 85m is properly banked for a car traveling 65 km/h what must the coefficiant of static friction be for a car not to skid when traveling at 95km/h Homework Equations For this question i tried using a few equations such as centripical force...