Friction force Definition and 235 Threads

A dancer is standing on one leg on a drawbridge that is about to open. The coefficients of static and kinetic friction between the drawbridge and the dancer's foot are mu_s and mu_k, respectively. n represents the normal force exerted on the dancer by the bridge, and Fg represents the...

Homework Statement 1) Consider the hydraulic lift which has a smaller piston of area A1 and a larger piston area A2. Initially the two pistons are not moving. Show that in order to raise the larger piston by a distance d2, it is necessary to apply a force △F = ρg(A1 + A2)d2 on a smaller...

Homework Statement A 5000 kg truck is parked on a 14 degree slope. How big is the friction force on the truck? Homework Equations friction = coefficient of friction X normal force The Attempt at a Solution I tried breaking the weight into components. I used 1.00 as the...

Homework Statement A 20.0 kg packing case is initially at rest on the floor of a 1400-kg pickup truck. The coefficient of static friction between the case and the truck floor is 0.30, and the coefficient of kinetic friction is 0.20. Before each acceleration given below, the truck is traveling...

Hi guys, I have a circular disk on the end of a rotating shaft. The disk is pressed into another plate and is rubbing together making friction. I need to know how much heat is going to be generated by the friction. I think it is a function of the velocity of the plate, the reaction force...

what is the average friction force when a person has a usual 1 km walk ?

Work done by a friction force, block moving up a ramp--question Homework Statement 100kg block moves up on a rough surface, at an incline of 30 degrees, a constant force P=800 N is applied horizontally moving the block a distance of 3 M up the ramp in a time interval of 2 seconds, v1=0.8...

Friction force dilema. A new physics breakthrough? :) Sometimes during lunch time, strange talks appear :). And then great doubts about life and physics... Imagine two cars: one with wide tires and the other not that wide. It is obvious that the car with wider tires will curve better and...

Homework Statement A 50 kg trunk is pulled 6.0 meters up a 30 degree incline at a constant velocity. The coefficient of kenetic friction is .2. What is a) the work done by the applied force, b) the work done by gravity and c) the work done by the frictional force I set up my x-axis in the...

Homework Statement At a certain part of your drive from home to school, your car (mass m) will coast in neutral at a constant speed of v if there is no wind. Examination of a topographical map shows that for this stretch of straight highway the elevation decreases an amount h for each segment...

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...

Hi! I have a simple question: How does the friction force that acts on a body that is laying on an inclined surface depend on the angle of the surface? Thanks.

hi! if i were to push a carton, and the friction force was 200 Newtons.. how much force would i have to exert so the box is accelerating at 2m/s/s? i don't know how to calculate it because the mass of the carton is not given..anysuggestions?

Ok, our teacher is pretty much insane and doesn't teach anything at all. I'm sure this problem is incredibly simple, but I'm just not sure how to do it. Original Problem: A 15.0 kg box is released on a 32 degree incline and accelerates down the incline at .30m/s/s. Find the friction force...

the question is A 35kg crate rests on the back end of a flat bed truck. the coefficient of static friction between the crate and the bed is 0.175 what is the maximum force of static friction that the truck's bed can exert on the crate? b) what is the maximum acceleration the static...

Hello, i have been asking a lot of question lately, i had 60 questions to do for hw, and I'm kinda confused on some of them... A 0.5kg block is placed on top of a 1.0kg block, the coefficient of static friction between the two blocks is 0.35. The cofficient of kinetic friction between the...

I was wondering if someone could help explain this. I don't understand how to calculate the friction force... So here's the question I'm working on You are applying a 400-Newton force to a freezer full of chocolate chip ice cream in an attempt to move it across the basement. It will not...

Hello everyone, I have have no clue on how to go about this problem here, if someone can explain how to go about these it would be great! THANK YOU ALL! Problem 1: A 62 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 15° above the horizontal. (a)...

Hi everyone. :) My first post here! Anyway, I have a Physics12AP question that I would like some help with. I've been thinking about it for a long time but I have not been able to solve it. Here's the problem: A car on a horizontal road makes an emergency stop such that all four wheels lock and...

The handle of a floor mop of mass m makes an angle theta with the vertical direction. Let muK be the coefficient of kinetic friction between the mop and the floor and muS be the coefficient of static friction. Neglect the mass of the handle. a) Find the magnitude of the force F directed...

Direction of friction force is oppose relative motion of the surface . What is relative motion of the surface mean and how to identify the direction of the relative motion of the surface .

Help please! A crate full of artichokes rests on a ramp that is inclined 10.0 degrees above the horizpntal. Give the direction of the normal force and the friction force acting on the crate in each of these situations. a) The crate is at rest. b) The crate is being pushed and is sliding up...

A uniform ladder 5.0 m long rests against a frictionless, vertical wall with its lower end 3.0 m from the wall. The ladder weighs 160 N. The coefficient of static friction between the foot of the ladder and the ground is 0.40. A man weighing 740 N climbs slowly up the ladder. a) What is the...

I wasn't for sure where to start with this problem. It is the first of 3 so if I understand how to do this one, I will be able to most likely get the others. I'm pretty sure that I need to make a free-body diagram of the forces in this situation but wasn't for sure where to label the friction...

we have an inclined steel plain at angle 20 degree and have a 50 kg steel file the first question is finding the static friction force it's ok ı have found it by using Newton's 2nd law but the second question is at what angle will the cabinet begin to slide ? ı tried equations but ı wasn't...

:( 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...

i've been trying to figure this question out for about half an hour now and I'm still where I started. if some one could help me i'd be much obliged. a 17 kg box is released on a 35 degree incline and accelerates down the incline at .270 m/s^2. Find the friction force impeding its motion...

Hey guys, I need help on some physics problems again. A 15g bullet strikes and becomes embedded in a 1.10kg block of wood placed on a horizontal surface just in front of the gun. If the coefficient of kinetic friction between the block and the surface is 0.25, and the impact drives the block...

Hi I'm new here, I hope someone can help me. I think I got the first half of the question, but I got stuck one the second part. Well here it goes, A force of 40N accelerates a 5.0kg block at 6.0m^2 along a horizontal surface. a.) How large is the friction force? b.) What is the...

a stockroom worker pushes a box with mass 11.2kg on a horizontal surface with a constant speed of 3.50m\s^2 The coeficient of friction is (for surface of the ground and box) .20 A...what horizontal force must the worker apply to maintian the motion.. i got F_x=21.9N which is correct and then it...

The coefficients of friction between a 1kg mass and a surface are ms=.54 and mk=.46. Assuming the only other force acting on this block is that due to gravity, what is the force of friction (give magnitude and direction) on block: -if the block is at rest and the surface is horizontal? would...

Here's there problem: You are running, your weight is 800 N. You generate a backward and downward force of 1000 N at an angle of 15 degrees from vertical. What is the maximum friction force you can generate and the actual fritction force generated between the surface area and your shoe...

Is there any ways to find the momentum in force of friction of an object? What is the equation formula to find the force of friction in momentum?

Does the speed of a block of wood being pulled across a surface go twice as fast if you pull twice as hard? If yes/no, why? Thanks to anyone who will answer that!

The problem starts with two masses, m=16kg and M=88kg. m is pushed against the middle of M with a static friction coefficient of .38, and M is on a frictionless floor. The first part of question asked to find the force necessary to prevent m from falling. After drawing the free body diagram it...