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Questions tagged [friction]

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

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Direction of friction of a block moving down a plane

Lets say that there is a block is on an incline, but given a horizontal push before being let go. Once the block is let go, friction will oppose the component of gravity acting along the ramp, $mg\sin(...
Emil Sriram's user avatar
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Question regarding friction acting on a disk on a conveyor belt [closed]

I have the following problem on which i am working A horizontal conveyor belt is running at a constant speed of $v_b = 3.0\hspace{1mm}m/s$. A small disc enter the belt moving horizontally with a ...
Hhh Hhh's user avatar
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A paradox while explaining the equilibrium of books

An even number of books (say four) are held in the manner shown in the figure. It is obvious that if we apply a large force inwards, we can increase the normal force, and hence the friction which ...
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Work Done by kinetic friction in Circular Motion

We know when an object is moving in a circular motion on a rough horizontal surface, direction of kinetic friction is constantly. Thus, fto calculate the work doen by friction, we need to use ...
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Tension of rope over frictionless edge obstructing block

Consider the diagram below. All corners are assumed to have no friction. Is it true that the tension throughout the rope is equal in all sections? The section over the edge of the building, the ...
Bucephalus's user avatar
1 vote
4 answers
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In an ideal situation, why should no friction exist when an object rolls? [duplicate]

As per my textbook, “a body like a ring or sphere rolling without slipping over a horizontal plane will suffer no friction in principle. At every instant, there is just one point of contact between ...
Saanvi Kalra's user avatar
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Boundary condition for friction on stress tensor

I want a boundary condition for the stress tensor for limiting friction. The general equation for this is $F=\mu R$. I want to investigate this on an interface. If I have a material being deformed, ...
Mat Hunt's user avatar
1 vote
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Find curve minimizing energy loss due to friction [closed]

I am looking for an ansatz of the following problem: Given a mass $m$ moving in a constant gravitational field along curves $C$ connecting two fixed points I want to find the curve $C_0$ that ...
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Rolling ball on a surface with friction

For a point particle moving on a surface under the infuluence of gravity, the equation of motion is very easy to write down - the force on the particle is simply the projection of its weight $mg\...
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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 ...
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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 ...
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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 ...
SMK's user avatar
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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 ...
Prasoon Jha's user avatar
2 votes
1 answer
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 ...
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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 ...
suryabh asjdncw's user avatar
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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 ...
ShoutOutAndCalculate's user avatar
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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?
CaptainAmerica Whyso's user avatar
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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. ...
CaptainAmerica Whyso's user avatar
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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 ...
Dominic Stewart-Guido's user avatar
4 votes
2 answers
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 ...
jazzblaster's user avatar
2 votes
2 answers
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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 ...
Dominic Pham's user avatar
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4 answers
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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 ...
Mohamed Ibrahim's user avatar
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1 answer
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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 ...
Lukasz Skowron's user avatar
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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 ...
Plop's user avatar
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3 answers
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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 ...
Nightwing's user avatar
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1 answer
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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 ...
LvdT's user avatar
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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 ...
android's user avatar
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6 votes
4 answers
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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 ...
Vulgar Mechanick's user avatar
1 vote
2 answers
167 views

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, ...
Oğuzcan Taşdemir's user avatar
12 votes
4 answers
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How does a snake climb the wall?

Consider a snake climbing up the wall or ant climbing up the wall, which force is responsible for it? An obvious answer is frictional force but my question is that if there is a normal reaction ...
Kampann's user avatar
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3 answers
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Friction between the two blocks

In a given problem, a force is applied to a block which sits on top of another block which in turns sits on a table top. The coefficients of friction between the lower block and the table is given as $...
Akhilesh G's user avatar
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Pure rolling interrupted, does friction provide impulse?

When a ring is under pure rolling (no slipping and friction zero) on a horizontal rough surface and now another small ball hits it, can there be impulse due to friction? I feel that there should be ...
Anon's user avatar
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3 answers
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Force excerted on 2 objects travelling with same acceleration

Suppose two objects A and B are travelling on a smooth surface (in a linear path) with the same acceleration. B is behind A and having contact with A. (Both A and B have separate unbalanced forces ...
Yara Try's user avatar
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1 answer
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Static friction, no work

Imagine a ball rolling without slipping on the floor. Then the force of static friction has non-zero torque, so why it doesn't change the overall energy of the ball?
Piotr H's user avatar
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2 answers
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Finding the frictional force between 2 objects moving with same acceleration [closed]

This is a problem I faced when reading a textbook. Lets imagine we have a wooden block of mass M (2kg) on a trolley of mass m (20kg) which is kept on a smooth floor. The frictional coefficient between ...
Yara Try's user avatar
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0 answers
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When a wheel begins to roll on a flat surface, is it due to fulcrum generated at the contact point by friction?

[Edit: What I'm trying to understand is how any wheel rolls on a surface, instead of just spinning in place. I know that friction provides the force to make the wheel roll, but I'm unsure about the ...
cosmos's user avatar
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0 votes
2 answers
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Is energy conserved on a ball sliding without friction?

If a ball is sliding without friction (down an inclined surface) is energy conserved? I can’t think of why it wouldn’t be, but my intuition on this stuff is really bad.
edster101's user avatar
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3 answers
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Rolling in opposite direction to linear motion

In this blog about a cylinder rolling up a frictionless incline, the author concludes that the cylinder will still be spinning clockwise at the top of its ascent up the hill and will then descend with ...
KDP's user avatar
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2 votes
4 answers
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Why doesn’t a cart accelerate when I push it with a constant force?

If I push a cart with a constant force, it moves at a constant velocity, so there must be no net force. The applied force must be canceled out by kinetic friction and air resistance, but the magnitude ...
jazzblaster's user avatar
1 vote
2 answers
114 views

This model of friction implies the speed decays exponentially, but shouldn't it actually vanish within a finite amount of time?

A snooker player strikes the cue ball, so that it starts moving with constant speed $v_{0}$. We assume that spin plays no role in its motion. Due to friction between the ball and the cloth of the ...
M. Wind's user avatar
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1 answer
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How do objects roll?

This is not a question about how already rolling objects or stationary objects with torque continue rolling. I understand that this happens because of static friction. I know that round objects ...
nonhuman's user avatar
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4 answers
166 views

How can an object with no applied force by an external agent still have friction?

To begin, this is what I've learned about how to calculate the friction for any case: kinetic friction acting on a body is the Frictional coefficient x Normal acting on the body however, if kinetic ...
Ayush Singh's user avatar
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0 answers
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Finding the torque required to turn a cart resting on 4 wheels

I am building a cart that has two handles on the bottom face. The cart is basically a table resting on castor wheels, one on each leg. If I apply a couple on the handles, the cart will turn. I am ...
user-2147482616's user avatar
1 vote
2 answers
40 views

Why exactly (on the level of particles interacting with each other) do things heat up with friction? E.g. airplane from friction with air

Why exactly (on the level of particles interacting with each other) do things heat up with friction? E.g. airplane from friction with air. Also what is the difference between conduction and convection,...
Alexei M's user avatar
-1 votes
1 answer
36 views

Momentum conservation and collisions [duplicate]

Whenever a collision happens on a rough horizontal surface, because the frictional force will be external to the system, momentum wont be conserved. However, can we consider the friction to be ...
Krrish Gupta's user avatar
0 votes
2 answers
78 views

Horizontal forces of a wheel that is rolling and slipping while subjected to a coupled moment?

I am trying to understand what's going on with this problem: I summed the forces in the $x$-axis, which is horizontal, and I thought the moment would create a force opposing the friction force. ...
SoleCore's user avatar
18 votes
9 answers
8k views

Where does "excess" energy go when a vehicle uses a lower gear to move at a given speed?

So I understand that a lower gear as advantageous when accelerating a vehicle or when driving up hill (e.g because you are having to accelerate against gravity). I know this is because of the ...
OceanExplorer's user avatar
3 votes
2 answers
540 views

Energy loss due to friction in Rolling Motion

I understand why rolling motion does no work. My (possibly imprecise) summary of the answer is that net work done is zero. And the role of friction is to convert translational kinetic energy into ...
Starlight's user avatar
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1 answer
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Understanding normal reactions on a ring

I need to find all the normal reactions and the frictional forces acting on the ring to keep it in a state of equilibrium. It's given that a force $\vec{P}$ is being applied by a finger on a ring that ...
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