Static friction Definition and 507 Threads

Structural integrity in my head means an object's uncompromised ability to safely resist required loads. Now is static friction related any way to it since the way to break structural integrity is to overcome the object's max load limit? Also how can you walk across the floor without you or...

Homework Statement Figure P10.77 shows a vertical force applied tangentially to a uniform cylinder of weight F(g). The coefficient of static friction between the cylinder and all surfaces is 0.500. In terms of F(g), find the maximum force P that can be applied that does not cause the cylinder...

Homework Statement The coefficient of static friction between the person and the wall is .61. The radius of the cylinder is 6.56 m. An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall when the...

A large cube with a mass of 25 kg is being accelerated across a horizontal frictionless surface by a horizontal force P. A small cube with a mass of 4.0 kg is in contact with the front surface of the large cube and will slide downwards unless P is sufficiently large. The coefficient of the...

Car 1 with mass m rounds a curve of radius R traveling at a constant speed v. Car 2 with a mass 2m rounds a curve of radius 2R at a constant speed 2v. How does the magnitude F2 of the sideward static friction force acting on car 2 compare with the magnitude F1 of the sideward static friction...

A box full of fragile objects is on the back seat of your car. You are driving at 65 mph (29 m/s) on I-79. As you get off at exit 147A for Meadville, you must slow down to 0 mph. Estimate the minimum amount of time should you take to slow down (based on the appropriate acceleration) without the...

Why is the kinetic friction always smaller than the limiting static friction? Thank you very much!

Brad is sitting at rest on a wheeled chair in a long hallway. He and the chair have a combined weight of 540 N. His friend throws a 15 kg medicine ball horizontally at Brad with a velocity of 6 m/s. Brad cataches the medicine ball. If the coefficient of static friction between the chair wheels...

Can anyone help? The coefficient of static friction between hard rubber and normal street pavement is about 0.34. On how steep a hill (maximum angle) can you leave a car parked?

An automobile with four wheel drive has mass of 1000kg. Its weight is evenly distrubuted among the four wheels, whos coefficient of static friction with the road is 0.80. If the car starts from rest and the road is horizontal calculate the maximum acceleration it can attain without spinning its...

Another concept my physics prof didn't teach the class. I would love to be able to attempt these problems but I have no idea what these concepts are or the formulas for them. I'm not looking for the answers to these problems here folks, but rather a method in which to solve them. Thanks! 1. A...

In my physics textbook (Resnick, Halliday, Walker) , it is given that the direction of force of static friction acting on a wheel undergoing pure rolling without sliding on the ground and whose centre of mass is accelerating uniformly, is the same as the direction of acceleration of COM...

Hi, the problem I have is one dealing with static friction. The problem states: The coefficient of static friction between hard rubber and normal street pavement is about 0.8. On how steep a hill (maximum angle) can you leave a parked car? I know that the downward force is "g" and that...

Hey there, I'm trying to find some information on static friction, particularly extended theories of Amonton's. So far, I've found that Amonton said that static friction is a result of surfaces conforming to each other while not moving. I'm tyring to find recent extensions to this theory...

The coefficient of static friction between the tires of a car and a horizontal road is s=0.56. If the net force on the car is the force of static friction exerted by the road, what is the magnitude of the maximum acceleration of the car when it is braked? I really don't understand what is...

An apple crate with weight of 49N accelerates at 0.5m/s2 along a horizontal a force of 20N apllied above the horizontal at 19 degrees is required to bring the crate on the verge of motion. Find the coefficient of static friction between the crate and the surface. -usn+20 cos 19 x direction...

Romeo takes a uniform 10-m ladder and leans it against the smooth wall of the Capulet residence. The ladder's mass is 30kg, and the bottom rests on the ground 2.55m from the wall. When Romeo, whose mass is 70 kg, gets 88 percent of the way to the top, the ladder begins to slip. What is the...

hi Is maximum possible static friction between a particular body and a particular surface equal or smaller to k(s) * N ? k(s) means coefficient of static friction If it is smaller, then only when force pulling on object is greater than C(s)*N will body start moving ? I'm...

I was working the following problem: Two blocks rest on a horizontal frictionless surfce (the top block being 5kg and the bottom block being 10 kg). The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks. A 30 N force is applied to the...

hey I did this experiment where I dragged a mass by a scale until it moved to find the static friction. Then weight was added to the mass and the process reapeated. My question when graphed and the mass or Fn on the x-axis and the applied force or Fs on the y-axis should it not plot a...

hey I did this experiment where I dragged a mass by a scale until it moved to find the static friction. Then weight was added to the mass and the process reapeated. My question when graphed and the mass or Fn on the x-axis and the applied force or Fs on the y-axis should it not plot a straight...

Hey quick question, I did this experiment where I dragged a block across a flat surface with a scale and found the static friction, ehn weight was added to the block and repeated the process. MY question is when graphed with the mass or Fn on the x-axis, and applied force or Fs on the x axis...

This is what I did: F_x\leq\mu_s N=\mu_s\left(mg+F\cos{\theta}\right) ...and then I would simplify. But unfortunately, I was expecting the "F"s to cancel out, meaning the force didn't matter at that critical angle. They didn't obviously. Did I set this up correctly? If not, where did I go...

I was reading a post in the homework section about friction being able to do positive work. Several people provided examples, and one was the case of a car. Doc Al pointed out that static friction did not do any work on the car because the wheel was not slipping and the friction force acted...

Everywhere I've read that static friction is usually greater than kinetic friction, but I haven't been able to find the exception to that. So I have two questions: Is there a real life example where the coefficient of static friction is less than the coefficient of kinetic friction between...

Question: how would i find the coefficient of static friction that would keep people from falling out of a spinning amusement park ride when the bottom dropped out if all i knew was the radius and the amount of revolutions per second...?

Hello! I have this problem I must submit by tomorrow 11 PM and I am getting the wrong answer and cannot figure out what I'm doing wrong. Any help would be great. Here is the problem: "In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." (See Fig. 5-35.) The...

You see the boy next door trying to push a crate down the sidewalk. He can barely keep it moving, and his feet occasionally slip. You start to wonder how heavy the crate is. You call to ask the boy his mass, and he replies " 51.0 kg." From your recent physics class you estimate that the static...

Could someone please clarify this problem for me... Assume we have a box sitting on the back of a truck. The box can be modeled as a particle, and there is friction between the box and the surface of the truck. Also, let's assume the truck is accelerating slow enough that the block does not...

Here is my problem, A washing machine has a weight of 975 N. It requires a minimum force of 350 N to move it along a tile floor. What is the coefficient of static friction between the washing machine and the tile floor? This is the equation I used to find the coefficient of static friction...

Ideal rolling is rolling without slipping. Precisely, it is when the distance covered on the ground is equal to the arc length rotated through the circle during any time interval. Since rolling involves only static friction (as opposed to kinetic friction in rolling with slipping), the...

A backpack full of books weighing 47.0 N rests on a table in a physics laboratory classroom. A spring with a force constant of 150 N/m is attached to the backpack and pulled horizontally. If the spring stretches by 2.20 cm before the backpack begins to slip, what is the coefficient of static...

Any help will be aprreciated... 1. A car traveling on a flat circular track accelerates uniformly from rest with a tangential acceleration of 1.70 m/s2. The car makes it one quarter of the way around the circle before skidding off the track. Determine the coefficient of static friction...

I had a questiion about static friction. Basically, if the gravitational acceleration on the moon is 1.63m/s^2, and your weight is roughly 1/6 of that on Earth, you can jump higher on the moon than you can on earth. So if you were playing basketball on the moon, you could jump higher and...

Okay this one is really starting to get on my nerves. Drawing in the attachment. Mass of ladder is 12kg. Mass of painter is 60kg. The ladder begins to slip when the person is 70percent up the ladder. The wall is frictionless. What is the coefficient of static friction between the...

:( static friction force? mew? do what now?? Okay, thanks for helping me first off. Second, i was absent :( and now I'm pretty confused on a few problems that do with force. the first of four problems, i don't understand, like, what exactly is mew? ok .. 1. a 225 kg crate is pushed...

To move a large crate across a rough floor, you push down on it at an angle of 21 degrees. Find the force necessary to start the crate moving, given that the mass of the crate is 32 kg and the coefficient of static friction between the crate and the floor is 0.57. The back of the book gives...

A 10KG block is resting on a plane inclined at an angle of 30 degrees from the horizontal. Find the force of frction holding the block stationary. is it possibel to calculate the exact coefficient of static friction from the above information? explain. for this quesiton, I can find the...

A 2.0 kg block slides along a horizontal surface with a coefficient of friction µk = 0.30. The block has a speed of v = 1.3 m/s when it strikes a massless spring head-on (a) If the spring has a force constant k = 120 N/m, how far is the spring compressed? (b) What minimum value of...

The problem reads: A banked circular highway curve is designed for traffic moving at 60 km/h. The radius of the curve is 200 m. Traffic is moving along the highway at 40 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow cars to take...

Hi, I'm having trouble solving this problem: A woman attempts to push a box of books that has mass up a ramp inclined at an angle (alpha) above the horizontal. The coefficients of friction between the ramp and the box are (mu_k) and (mu_s). The force F applied by the woman is horizontal...

Hey guys, I was wondering if you could help me out with the following problem... In a "Rotor-ride" at a carnival, people pay money to be rotated in a vertical cylindrically walled "room". If the room radius is 5.0 m and the rotation frequency is .60 revoloutions per second when the floor...

Just been trying to think about why static friction is generally higher than Dynamic (or Kinetic) Friction? In a really crude sort of way I could imagine that the momentum of the object has something to do with it... but this doesn't really seem satisfactory to me... I suppose I just would...

Please help... I need help with this 2 physics questions...thanks in advance.. 1. A car can negotiate an unbanked curve safely at a certain maximum speed when the coefficient of static friction between the tires and the ground is 0.946. At what angle should the same curve be banked for the...

I'm struggling on a presentation problem in my physics class. The problem reads: A crate containing machine parts sits unrestrained on the back of a flatbed truck traveling along a straight road at a speed of 80 km/h. The driver applies a constant braking force and comes to stop in a distance...

Here is a problem from a worksheet I have..I'm having a little trouble with it. My teacher neglected to explain most of it: Now, I know everything is done in m/s, so that's 100/9 m/s. I know what the problem is asking and everything..but I don't have any formulas that I can use (I don't...

I missed the section on static friction and I can't get this question. Can someone help me out? What mass can you hang onto the string so that the 0.8kg box will just begin to move? The 0.8kg box is sitting on a flat surface with a coefficient of friction of 0.50. This box is attached...

I've been having trouble with the following problem: A curve of radius 60 m is banked for a design speed of 100 km/hr. If the coefficient of static friction is .30, at what range of speeds can a car safely make the curve? Here's what (I think) I know: We know that there are two forces...

Here is the question http://myfiles.dyndns.org/pictures/statics10-2.png I'll just do the part where the wire is long to show you what I have problems with. To answer the problem I drew a FBD for member AB. Here are my variables and what they mean: T - the tension in the wire at angle z By...

Circular Motion I think what I don't understand is how to find the normal force, especially with an object on a hill. My teacher didn't go over it very well so I have only a vague understanding of it. [b(] Here is a sample question that deals with it that I can not seem to figure out how to go...