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Questions tagged [friction]

The resistance a surface or object encounters when moving over another.

216 questions with no upvoted or accepted answers
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153 views

Is there quantitative theory of cutting with edge or blade

I wonder if there is some simple theory of what determine efficiency ( speed, energy end force required ) of cutting by edge ( blade , knife, sword ) At least something phenomenological like in case ...
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1k views

Is there any role of steering in turning?

I am aware of the practical requirement of turning the steering wheel to turn a car while going on a straight and even curved road. But in the proofs of turning of car on leveled or banked curves, we ...
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953 views

Work done by rolling vs skidding friction force

Two identical bicycles having equal weight riders are traveling along a level road adjacent to each other with the same non-zero velocity. Bike A, (the "skidder"), applies the rear brake strongly ...
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165 views

Finding kinetic friction coefficient

A box is thrown up an incline with degree $\alpha$. the kinetic-friction coefficient is $\mu_k$. the body returns back to its start point. a. prove $\frac{t_{down}^2}{t_{up}^2}=\frac{a_{up}}{a_{...
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3k views

Forces on two boxes

This is a problem from my problem sheet but we haven't yet covered the material or received our books. There is a small box of mass $m_{1}$ resting on a plank, of mass $m_{2}$ and length $L$, which ...
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721 views

Friction From an Object On-Top of a Sliding Object

Consider a block $A$ lying on a flat and frictionless table, and a block $B$ lying on top of block $A$. A horizontal force $F$ is applied to block $A$. If there is no friction between blocks $A$ and $...
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105 views

Modeling of exact stick-slip-friction using Linear complementarity problems (LCP)

Within my master's thesis, I try to model a machine elements and have to model the exact slipping and exact sticking between the bodies. So I noticed that such problems can be formulated as a LCP. ...
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87 views

Modeling Acoustic Lubrication

I thought about posting this question in the Biology StackExchange site but really it is just the application of my question that applies to biology not the core of the question itself. Can anyone ...
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0answers
1k views

What is the angle of the string with the vertical?

A heavy uniform sphere of radius $a$ has a light inextensible string attached to a point on its surface. The other end of the string is fixed to a point on a rough vertical wall. The sphere rests ...
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1k views

FPS to MKS usage issues

I'm currently taking a high school physics class and we're doing friction problems now. I've been doing the ones that use MKS perfectly well, but when the problems start to use the FPS system, I'm ...
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345 views

Stoke's Drag Constant

I'm trying to calculate Stoke's drag constant using the equation found here. The system I wish to calculate it for is a mass oscillating vertically on a spring through air. The temperature is 25 ...
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1answer
174 views

Net force on a brick sitting on an accelerating merry-go-round

everyone. I'm doing some exam prep (not a homework question), and I'm not sure how to parse the total force acting on the brick. Here's the question: "A friend and I are bored. So we visit the local ...
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1answer
59 views

Flat hose wrapped around a cylinder

It was always taught to me that friction is independent of surface area. I was recently made aware that that is only partially true. My question is: would a layflat hose and a rope of equal weight and ...
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18 views

Air resistance in multirotor aerial vehicle (MAV)

Im modeling the aerodynamic friction (translational and rotational) that affects a quadrotor in movement. I think that I can approximate it with a constant multiplied by linear or rotation velocity ...
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1answer
59 views

Analyzing Velocity vs time graph

So I did an experiment on conservation of momentum, where two carts with different mass start at rest and get accelerated and we measure the speed. What I observed was that after the acceleration, ...
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27 views

What exactly is a coefficient of friction due to electron stopping?

To be more specific, I am looking to understand what electron stopping is and how I could possibly define a coefficient of friction due to electron stopping. I am running MD simulations using LAMMPS ...
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11 views

Deriving the dynamic friction of an oversize shaft in a hole

I want to derive the force of dynamic friction of an oversized shaft in a hole. Suppose the dynamic coefficient of friction is $\mu$. Here is my attempt. Suppose the hole has diameter $d$ and the ...
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1answer
34 views

Damped Oscillation and Period

In my school experiment, I wanted to measure the gravitational constant ($9.81 \ m/s^2$) by using a pendulum. If we take into account the damped oscillation (i.e. friction forces), does that affect ...
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4answers
52 views

Doubt relating pure rolling

As we know, when an object perform pure rolling on a plane having friction the friction acts on the edge in the direction opposite to the direction of its translational motion. There are no other ...
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0answers
24 views

Ball rotating on flat surface with kinetic friction

Suppose you have a ball with moment of inertia $I$, rolling on a surface with kinetic friction coefficient $\mu$. Initially, it has a linear velocity of $v_0$ and an angular velocity of $w_0$. Also, ...
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1answer
21 views

Velocity of the point of contact when we are walking

I know friction applies the forward push needed to walk (without slipping). Can we say that the point of the contact ( on the backward foot?) when we are walking will be at rest wrt the ground in much ...
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1answer
9 views

Horizontal component of velocity in case of rolling

I was having a hard time to understand that the point of contact in case of rolling without sliding has zero velocity. So after some research, I posted my understanding as an answer How can the ...
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0answers
13 views

Does friction torque in speeding up rotation is the same as fiction in speeding down?

I'm trying to calculate moment of inertia of a pulley connected to a shaft mounted on bearing by using free fall method. A load (270 g) is tied to a string and the string is wrapped around pulley. ...
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1answer
49 views

Why do we consider the viscous force to be tangential?

Is it that since it is a friction force, it needs to be tangential as other friction forces like kinetic friction and static friction forces are?
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2answers
175 views

Isn't friction on an incline coefficient of friction times the Reactional force?

Question - "As shown in figure a body of mass 1 kg is shifted from A to D on inclined planes by applying a force slowly such that the block is always in contact with the plane surfaces. ...
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28 views

Maximum acceleration on a turn

The question $\\$ Suppose a car enters a turn with an initial speed $\vec{v_1}$, and comes out with a final speed $\vec{v_2}$ perpendicular to the direction of $\vec{v_1}$. The driver does everything ...
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1answer
29 views

What's the “cause” of damping coeff. in springs?

What's the "cause" of damping coeff. in springs? Air resistance, friction?
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3answers
58 views

Rolling without slipping forward force

I'm studying rolling without slipping, I want to find the net force making a wheel go forward when applying a torque about the axle of the wheel. In this page https://www.school-for-champions.com/...
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1answer
18 views

How do I know that $\mu_k$ independent of velocity and the area of contact?

Doubts:- Although he is stating that till now there is no effective model to explain kinetic friction. (1)Why Kinetic friction is independent of the contact area of the body with the surface? (2)Why ...
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3answers
91 views

Inclined plane with friction and a spring

I am given a body with a mass of 1 kg that slides at a constant speed down an inclined plane with an angle of 30 degrees. At the end of the incline there is a spring with a spring constant of 500 N/m. ...
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30 views

Effect of Particle Size on Angle of Repose for Sand

I have been doing research into how the size of granular material affects the angle of repose. There have been several conflicting results on this topic. Several papers cite that the angle of repose ...
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2answers
81 views

Laws of motion (friction on rough inclined plane)

For equilibrium of a body on an inclined plane of inclination 45°. The coefficient of static friction will be 1) greater than one. Why? My question is why do we use greater than sign instead of ...
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1answer
37 views

Work done by static friction in Rolling

In rolling without slipping, I understand that the velocity of the point where static friction with the ground is 0, and therefore static friction cannot do work. However, from newtons laws, an object ...
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1answer
61 views

How to find the equation of motion for a bead of mass $m$ threaded on a circular loop with dynamic friction coefficient $\mu_k$?

I have been working on a particular physics problem but am not sure if I have analyzed it correctly. Here is the problem: "A bead of mass m is threaded on a metal hoop of radius $R$. There is a ...
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0answers
14 views

What is the surface roughness of glass-filled Nylon?

I need to calculate the water pressure loss in a pipe made of glass-filled nylon. The pipe is used for irrigation/gardening. I planned to use moody chart to find the friction factor, but I can't find ...
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1answer
107 views

Are there any formulas that calculate the stopping distance of a car on different surfaces that include deceleration?

I already found the formula $d = v^2/2\mu g$ where '$v$' is for velocity, '$\mu$' is for the coefficient of friction between the tires and the road surface, and '$g$' is the acceleration of gravity. ...
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0answers
68 views

At what speed in air would a solid object turn to plasma?

Just curious, friction can heat up what ever is moving. The faster something moves the quicker it heats up. Is it possible in the perfect scenario to turn a speeding solid object to plasma through ...
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38 views

How to calculate coefficient of friction of given surface?

I have a surface in real life whose coefficient of kinetic friction I need to calculate. I've seen a method where people attempt to measure the angle at which the object on top begins to slide off the ...
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1answer
29 views

Static equilibrium (possibility)

In static equilibrium for a ladder leaning against the wall it is supposed to rotate about a point. Why we are not assuming it to slide down as in our practical life?
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1answer
18 views

Does Horizontal Velocity remain constant when it hits a surface in a Parabolic Motion?

It is told in one of the answers that the horizontal velocity stays at 4.0 m/s after the ball bounces from the plate. Why is it still at 4.0m/s, isn't there friction or is it neglected for the sake ...
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0answers
17 views

What is the internal force at the end of a tire and relation to the torque?

If an car axle is subject to a torque and if I consider the contact point of the tyre to the ground, it is stationary. Assume the car is moving left to right. Would the contact point be subject to an ...
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2answers
52 views

Real Pulley and Newton's Third Law

In a real pulley with two masses hanging from either side, the pulley rotates due to a non-zero torque, which I understand is caused by friction on the rope. I understand that if each mass was ...
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0answers
28 views

fluid flow over a incline and decline slope

I was recently watching fluid flow simulations on a cone. And noticed that if the tip on the cone is facing in the opposite direction to the fluid flow i.e fluid flow in $+x$ and tip of cone in $-x$ ...
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1answer
32 views

Friction Behavior at corners

The question: Find the range of value of $L/D$ such that the system remains in static equilibrium. And explain why such a range exists and not just a single value. This is the question where I ...
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2answers
44 views

Static or Kinetic friction

When a body is acted by a force such that it begins to move. In that case which friction is applicable? Is it the static friction as that would give a minimum value of force required to move the body? ...
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1answer
69 views

Does the mass affect the speed if friction is 0

A block $m_1$ strikes another stationary block $m_3$ inelastically . Another block $m_2$ is kept on $m_3$.Neglect the friction Between all contacting surfaces. Since $m_2$ is kept on $m_3$ and all the ...
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2answers
61 views

Work done by friction in a plane on a ball

An inclined plane has a rough and smooth surface which are of equal length. A ball is kept at rest at a height $h$ and is then rolled on the surface of the inclined plane. My question is that ...
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60 views

Is the Euler-Eytelwein equation also applicable for sliding friction?

Is the Euler-Eytelwein equation also applicable for sliding friction? Does this hold true if you just replace the coefficient of static friction with the one of sliding friction? I'm working on a ...
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63 views

Derivation of friction in interleaved phonebooks

Trying to understand the simple model in https://arxiv.org/abs/1508.03290, describing the friction between the pages of two interleaved phonebooks. Specifically I don't see how to get Eq. 1. Here's ...
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1answer
53 views

What does the term “no slipping” mean in mechanics?

Say, I have two blocks. One block is on top of the other. Suppose friction is present everywhere. What is the condition for no slipping?