# Questions tagged [friction]

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

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• 689
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### Calculating vehicle and tire acceleration with tire slipping

I'm attempting to simulate the motion of a vehicle with $N$ tires and I'm running into some trouble deriving forces/acceleration when adding friction and tire slipping into the picture. Here's an ...
• 103
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### Forces accelerating a tire

I'm attempting to write a little vehicle simulator and I'm working on calculating vehicle linear acceleration and tire angular acceleration. I'm trying to add in tire slipping and I'm having trouble ...
• 103
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### "Friction at a contact point", rubber-band experiment

I was working on some practice problems in my book, and the question was to describe all the energy conversions that happens when a person pulls on a rubber band and hits it on a board (any type of ...
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### How does a vehicle's brake affect the friction between the vehicle and ground?

When brakes are activated in a vehicle it decelerates. Analysing its motion, there can be only one force that can be responsible for it: the friction between the car and the ground. So does braking ...
63 views

### Motion of bowling ball

I'd like to model the motion of an asymmetric bowling ball thrown on a bowling lane. I know there's forward momentum and angular momentum that moment the ball is released, and there's of course ...
• 131
1 vote
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### Relationship between varying radius of ball and its affect on time taken for ball to come to rest in a spherical hemisphere while moving in a circle

I am a high school student trying to figure out the theoretical relationship between the radius of a ball that is launched into a bowl (moves in a circular path in the bowl) and the time taken for it ...
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### When does friction dependent on the contact area when the normal force was hold constant?

Related: Does the contact area affect friction forces? and https://physics.stackexchange.com/a/732573/209383. Basically, the Amonton's law of friction stated that $$F=\mu \cdot N$$ However, in ...
• 3,256
1 vote
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### Where exactly is the friction with the pipe walls and the fluid? [duplicate]

Is the friction between the walls of the pipe and the no slip layer? Or is it between the no slip layer and the rest of the fluid above?
1 vote
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### In turbulent flow, where is the friction of the pipe exactly? Is it between the laminar layer and the pipe walls or the turbulent layer and laminar?

In turbulent flow as we get closer to the pipe walls we encounter an overlap layer and then a layer of laminar flow. Also at the walls of a pipe, in turbulent flow, the laminar shear stress dominates. ...
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### If friction is not proportional to velocity, why do we model it as such when considering damped oscillations? [duplicate]

Early in our study of mechanics, we learn that friction is usually proportional only to normal force, without dependence on velocity. However, during our studies of damped oscillations, we often model ...
756 views

### After how many bounces will a ball's mechanical energy equal zero?

This was a question I asked myself for fun. It turned out to be more difficult than I initially imagined. The Problem: Let's say a ball is dropped from h0. Air friction is negligible. The collisions ...
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### How would I calculate the force of friction between an RC car and a carpet?

I'm working on a physics project where I aim to demonstrate how different surfaces impact the velocity and acceleration of an RC car due to friction. How can I calculate the coefficient of friction ...
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### Question about Newton third law especially the reactive force [closed]

Sorry for not giving much elaboration , here is a more detailed question,I have a confusion with the reactive force in dynamic cases (not in statics). Imagine there is a box and a person (both have ...
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### Friction acting on a moving car

I am trying to understand the nature and direction of friction force acting on from the ground a car driving up an incline. I was thinking about a simple situation where a car of mass $m$ is driving ...
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### Can we derive friction from collisions with environment?

I would like to know if friction, that is, the term $-\alpha \dot{x}$ in the equation of a conservative system $\ddot{x} = -\nabla U(x) -\alpha \dot{x}$ can be derived in some way, by assuming elastic ...
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### Infinite force paradox in pulling a car out of mud

Consider a car stuck in mud. A way to pull the car out would be tying a rope with a tree and pulling on the rope perpendicularly, at the midpoint: This works well as it magnifies the force depending ...
• 489
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### Motion of a particle falling along a rough circular rail

I’ve recently been reminded of an old disagreement I had with a very well-respected professor at my university back in my student days, I was tutoring for one of his courses and had been assigned the ...
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### What exactly means when a car is skidding or an object is slipping/sliding in terms of friction?

what does it mean when a car skids? which type of friction acts on the wheels? what does it mean when a car is not skidding? for both these questions, how do we frame the force equation and which ...
• 91
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### Static friction with ground when two blocks have different coefficients

Suppose I have two blocks of masses $m_1=m_2=m$ with coefficients of friction $\mu_1=1$ and $\mu_2=2$ respectively with the ground that are in contact. If I apply a force $F=2mg$ to $m_1$, what are ...
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1 vote
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### Why do large trucks have a longer stopping distance than cars?

It's common knowledge that large, heavy trucks can't brake as sharply as small cars. According to the Federal Motor Carrier Safety Administration: The average stopping distance for a loaded tractor-...
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### Friction / Energy Calculation for Solid Particle [closed]

I want to say this is not about homework question or something else. I want to understand fundamentals of friction inside the valve. A lot of journal or book mentioned friction loss or something else, ...