Coefficient of friction Definition and 416 Threads

Homework Statement A man with mass 78.0 kg sits on a platform suspended from a movable pulley, and raises himself at constant speed by a rope passing over a fixed pulley. The platform and the pulleys have negligible mass. Assume that there are no friction losses. Find the increase in the...

Homework Statement If you use a horizontal force of 30.0N to slide a 12.0-kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor?Homework Equations Ff=\mukFNThe Attempt at a Solution I thought maybe it would be...

Homework Statement A drunk driver in a 2400kg car plows into a 1200kg parked car with its brake set. Police measurements show that the two cars skid together a distance of 25m before stopping. If the effective coefficient of friction is 0.70, how fast was the drunk going just before...

Homework Statement Imagine a block sitting on an inclined plane rather than a flat surface. The angle Ө made by the plane relative to the horizontal can be changed. We could determine the coefficient of kinetic friction by inclining the plane (increasing Ө) until the block slides at a constant...

Homework Statement On a wet racetrack, the maximum safe speed, to avoid sliding on a level circular curve with a radius of curvature of 53 m, is 77 km/hr. What is the coefficient of friction between the car's tires and the track surface? Homework Equations (gravity)*(coefficient) =...

Homework Statement In a "rotor-ride" at a carnival, people rotate in a vertical cylindrically walled room. If the room radius was 5.5m, and the rotation frequency 0.50 revolutions per second when the floor drops out, what minimum coefficient of static friction keeps the people from slipping...

Homework Statement A skier traveling 11 m/s reaches the foot of a steady upward 22° incline and glides 13 m up along this slope before coming to rest. What was the average coefficient of friction? Homework Equations The Attempt at a Solution Can someone help me get started by...

Hi, I am new here and I need help with a problem. Homework Statement Hopping into your Porsche, you floor it and accelerate at 12 m/s/s without spinning the tires. Determine the minimum coefficient of static friction between the tires and the road needed to make this possible...

Homework Statement A block is placed onto a ramp. The ramp's angle of inclination is adjustable. Show that when the ramp is raised to the point where the block is just about to begin slipping the coefficient of friction can be determined from: μ= tan(theta) where (theta) is the angle of...

Homework Statement A 3.50 kg block slides 3.40 m down a long 15 degrees inclines ramp. the coefficient of friction between the block and the ramp is 0.30. find the following: (a) the work done on the block by friction (b) the work done on the block by gravity (c) the work done on the block by...

1. The coefficent for friction on wood. i don't know where to find the math because I am not taking engineering or whatever subject it is if i got the wrong area. I am taking biology and i can't find the equation. its a smooth piece of plywood. this isn't homework but for my...

The problem states: An 800N box rest on a surface inclined 30 degrees. If a force 200N parallel to the surface is applied, the box will not slide down the incline. Whats the greatest force that can be applied to the box before it starts sliding up the incline?? I know Fnorm=mg*cos theta...

I designed this lab for my physics class where we roll a hot wheels car down a length of wood that measured 1 m long. we did this process three times at varying angles and we want to investigate how changing the angle affects the coefficient of friction. The problem is, the times that we...

Homework Statement On a level road with its brakes on, the shortest distance in which a car traveling with 80 km/hr can stop is 95 m. This shortest distance occurs when the driver uses anti-lock brakes which means that that the car brakes without skidding. I found the deceleration to be...

Homework Statement I will be conducting a physics lab tomorrow, where the goal of the lab is to find or calculate the coefficient of friction in as many ways as possible. I have a block of wood at my disposal, and a wooden board. A stopwatch is able to be used as well. We will probably be...

Im designing a lab, in which i need to find the kinetic μ for a specific surface by sliding 6 different masses from the top, and taking the time it takes to reach the bottom. This surface is 30 degrees from the floor, making it a ramp. I will know the distance the masses cover. Some...

Question: A baseball player slides into third base with an initial speed of 8.35 m/s. If the coefficient of kinetic friction between the player and the ground is 0.36, how far does the player slide before coming to rest? How would I start this problem?? I would use Ff=uFn but it doesn't even...

I know that the force of friction is the (coefficient of friction) x (normal force). My question is, why isn't area involved? That is, why wouldn't a larger surface have more friction than a smaller surface, if the normal force is the same? PS: Sorry, just in case this is in the wrong section

Homework Statement Hi I am new to these forums but i have been trying for about 2 days now and still cannot find the answer to these 4 questions if someone could please help me it would be greatly appriciated! i come from a different country this is my third month in Canada, and i am doing...

Homework Statement For my Year 12 Physics EEI (Yes I have already asked for help about the actual prac, but now I'm onto writing up the theory:wink:) I conducted a prac where I rolled a fishing sinker down a 1.2m length of pipe into a tray of flour. I am now trying to use all relevant theory...

Homework Statement Mrs. K has just received a large shipment of candy at the local Blockbuster. Wanting to get out of the store as fast as possible (so that she can return to her loving husband) she uses the shrink wrap machine to bundle the candy into two blocks, one of 8 kg and the other...

Hey, I would like to check that my working for the following question is along the right lines. I have an exam this coming Wednesday and there are a few really common questions that I think I should do some work on. As always any help is much appreciated! :smile: The Question A parcel of...

Homework Statement This is in my work unit. Can someone lead me in the direction of finding the value of the coefficient of friction? What we have is a box being pushed up an incline plane. There is an applied force parallel to the horizontal as well as the force of gravity given. The...

Homework Statement mg sin θ/mg cos θ = μ (coefficient of friction) sinθ/cosθ = tanθThe Attempt at a Solution then does μ = tanθ/mg (which is what my teacher said, although I'm not sure i understand) OR is the above equation simplified so that μ = tanθ? :rolleyes: thanks for your help - and any...

[SOLVED] Coefficient of friction on an inclined plane Homework Statement The problem I have is to determine the coefficient of kinetic friction between two wooden objects, a block and a ramp, using the fewest measurements possible. The initial velocity will be 0. I can measure the angle of...

Homework Statement I just did a lab at school dealing with coefficient of friction for an object on an incline. After all my calculations done, my answer is negative for a cart sliding down, dealing with kinetic friction. Homework Equations The Attempt at a Solution I have...

Homework Statement **picture located as attachment** Homework Equations Tccw= Tcw The Attempt at a Solution My biggest problem is that I don't know what components are needed to find the coefficient of friction. I am able to find things like the tension/force of the string, but...

Hi I am having problem with this homework problem dealing with the coefficient of friction. A hockey puck having a mass of 0.3kg is slid across the ice, starting with a speed of 12 m/s and slowing to 11.3 m/s after traveling for 3 sec. What is the coefficient of friction between the puck and...

Homework Statement An attraction at a waterpark includes a straight waterslide 20m long at an angle of 34 degrees above the horizontal. The waterslide ends in a ramp 5 m long at an angle of 45 degrees above the horizontal. People sliding down the slide land in a small pool just past the end...

I wasnt able to find anything on the internet, so maybe someone else can help. I need to know the coeifficient of friction due to water. Like say a submarine is being pulled by something through the water and what i need to know is what would the friction be for the submarine (if there is a...

Finding the coefficient of friction (mew) DUE TOMOROW :( Our physics class went curling, and this is the data we had to collect.. Without Sweeping Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Trial 6 Trial 7 Time (s) 21.37 21.70 21.65 21.95...

Homework Statement A 4.00 kg block starts from rest at the top of a 30° incline and slides a distance of 2.10 m down the incline in 1.30 s. The Attempt at a Solution I solved for the frictional force acting on the block and got 9.64 N. I need to solve for the coefficient of friction...

Homework Statement A physics student is performing an experiment to determine the coefficient of friction between a physics textbook and a 2.5 m wooden ramp. He places the textbook, which has a mass of 1.2 kg, on the inclined ramp and gradually increases the angle of the incline. At an angle...

Hi, this is my first post and I'm a bit rusty will mechanics so I need help with two questions I've come across Firstly on the question sheet I am given: a = F/m and w = mg and the static friction and kinetic friction equations also v^{2} = v^{2}_{0} + 2a\Deltax How do I do these...

A sled is pulled 3 meters at constant velocity up a 20 degree incline. the efficiency of this procedure is 42%. Calculate the coefficient of friction between the crate and the incline. alright I'm completely clueless on this one. i know that efficiency=output (energy delivered by...

1. A 2 kg object slides down a frictionless track (starting 0.27 m above the ground) to a horizontal surface where it collides elastically with a 0.5 kg mass. 3.3 m later the 0.5 kg mass hits a k=25 N/m spring and compresses is 6 cm. What is the coefficient of friction on the horizontal surface...

A box that weighs 500N is sliding down a ramp at a constant speet. The angle the ramp makes with the horizontal is 25 degrees. What is the coefficient of friction between the box and the ramp? Can anyone give me some direction in how to approach solving this? I understand that Ff=u*Fn, but...

Homework Statement If a curve with a radius of 88m is perfectly banked for a car traveling 75km/hr, what must be the coefficient of static friction for a car not to skid when traveling at 95km/hr? Homework Equations i guess relevant equations would be tan θ = v^2/rg, but its says next to...

Homework Statement Lilly, whos mass is 45.0 kg, is ice skating with a constant speed of 7.00 m/s when she hits a rough patch of ice with a coefficient of friction of 0.0800. How long will it take before Lilly coasts to a stop? m=45 kg v=7m/s coefficient of friction=.08 Homework...

Homework Statement fgrav = mg fgrav = (0.0821)(9.8) = 0.80458 N fnet = ma = (0.0821)(0.0096) = 0.0096 m/s^2 fnorm = fgrav Homework Equations kinetic mew = force of friction / fnorm The Attempt at a Solution Required: Ffr kinetic mew = force of friction / fnorm kinetic mew = force of...

Homework Statement A 1 kg object is moving along at speed of 5 m/s right before colliding with a 4 kg stationary object, in a perfectly inelastic collision. Suppose that the objects are moving on a surface that has a coefficient of friction of mu=0.2. (Note you may still assume that the...

If a driver traveling down an 8% grade hill slams down the brakes of his car and skids 30 meters, what is the coefficient of friction ( assuming he was traveling at 25 MPH or more)? Appreciate your help asap.

Finding Coefficient of Friction [solved] Homework Statement A girl is ice skating at 10 m/s. She stops skating and glides to a stop in 100m. Find the coefficient of friction of the ice. Homework Equations uk = Fk / Fn F=ma The Attempt at a Solution I found the acceleration to...

Homework Statement A 10kg mass is released from rest and slides down an incline that makes an angle of 37degrees with the horizontal. The coefficient of friction is 0.4 on the incline. Determine (a) the force of friction acting to oppose the motion, and (b) the acceleration Homework...

Homework Statement an Olympic skier moving at 20.0 m/s down a 30.0 degree slope encounters a region of wet snow and slides 145 m before coming to a halt. what is the coefficient of friction between the skis and the snow?Homework Equations Force of friction = coefficient of friction x Normal...

Homework Statement You are standing on a merry-go round spinning at 12 rpm. The radius of the merry-go round is 5 meters, and you have a mass of 57kg. What static frictional force between your shoes and the merry-go round is required to keep you from flying off? Homework Equations...

Homework Statement The car's wheel with mass 1kg and radius 0.3m has initial speed 40rad/s. When braked, the force push to the center of the wheel is 10N. The car stops after 2s. Find coefficient.Homework Equations The Attempt at a Solution This is what I did Fc= Us.N= Us*m*g so Us= Fc/mg...

I've searched for this on google, but haven't found anything; does anyone know where to find the coefficient of friction between paper and plexiglass?

Can someone explain why the maximum coefficient of friction is 1?? Why μ <= 1 ? Thank You.

Homework Statement A box of weight W is pushed by a force F on a horizontal floor (the diagram below shows the force on the box is at an angle theta to the horizontal) If the coefficient of static friction is mu, show that the minimum value of F that will move the crate is given by...