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Static Friction

Static Friction

Static friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. It plays a crucial role in our daily lives, from walking on the ground to driving a car.
For example, consider a scenario where a truck is connected to a car by a rope, ready to tow it along a road. When no external force is applied by the truck, the car remains stationary and is said to be in static equilibrium. In this case, the forces acting on the car, such as gravity and the...

Static and Kinetic Frictional Force

Static and Kinetic Frictional Force

One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...

Rolling With Slipping

Rolling With Slipping

Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can...

Types of Friction Problems

Types of Friction Problems

Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
The first type of dry friction problem involves situations where there is no apparent impending motion....

Characteristics of Dry Friction

Characteristics of Dry Friction

Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...

Equation of Motion: General Plane motion - Problem Solving

Equation of Motion: General Plane motion - Problem Solving

Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...

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Updated: Aug 10, 2025

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes

Published on: December 13, 2016

Temperature dependent model for the quasi-static stick-slip process on a soft substrate.

Stefano Giordano¹

¹Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN - Institut d*Electronique de Microélectronique et de Nanotechnologie, F-59000 Lille, France. stefano.giordano@univ-lille.fr.

|February 15, 2023

Summary

We present a modified Prandtl-Tomlinson model for soft substrates, enabling friction studies in biophysics and microtechnology. This model accounts for substrate deformation, offering new insights into stick-slip phenomena.

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Last Updated: Aug 10, 2025

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes

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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

Area of Science:

Physics
Materials Science
Biophysics

Background:

The classical Prandtl-Tomlinson model describes friction between a slider and a corrugated substrate.
It is widely applied in nanotribology but assumes a rigid substrate, limiting its use in soft matter and biophysics.

Purpose of the Study:

To introduce a modified Prandtl-Tomlinson model that incorporates a deformable substrate.
To investigate the quasi-static behavior of systems with soft substrates.

Main Methods:

Developed a modified model using elastically bound quadratic energy wells to represent a deformable corrugated substrate.
Studied system behavior using equilibrium statistical mechanics.

Main Results:

Determined static friction and substrate deformation as functions of temperature and substrate stiffness.
The model successfully accounts for substrate deformability.

Conclusions:

The modified model extends friction analysis to soft matter and biophysical systems.
Results are relevant for understanding cell motion and developing haptic/tactile microtechnology systems.