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Frictional Force

Frictional Force

When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...

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...

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...

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.

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Related Experiment Video

Updated: Jun 8, 2026

Atomic Force Microscopy Cantilever-Based Nanoindentation: Mechanical Property Measurements at the Nanoscale in Air and Fluid

Atomic Force Microscopy Cantilever-Based Nanoindentation: Mechanical Property Measurements at the Nanoscale in Air and Fluid

Published on: December 2, 2022

Local nanoscale heating modulates single-asperity friction.

Christian Greiner¹, Jonathan R Felts, Zhenting Dai

¹Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Towne Building, 220 South 33rd Street, Philadelphia, Pennsylvania 19104, United States.

|October 9, 2010

Summary

We demonstrate precise control over nanoscale friction using a heated cantilever probe. Temperature-dependent friction changes in different environments offer new possibilities for nanomanufacturing applications.

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Published on: December 24, 2014

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Atomic Force Microscopy Cantilever-Based Nanoindentation: Mechanical Property Measurements at the Nanoscale in Air and Fluid

Atomic Force Microscopy Cantilever-Based Nanoindentation: Mechanical Property Measurements at the Nanoscale in Air and Fluid

Published on: December 2, 2022

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Published on: December 24, 2014

Area of Science:

Tribology
Nanotechnology
Materials Science

Background:

Friction at the nanoscale is critical for many technological applications.
Controlling friction at the single-asperity level is challenging.
Understanding the influence of temperature on nanoscale friction is essential.

Purpose of the Study:

To demonstrate the measurement and control of single-asperity friction using a heated cantilever probe.
To investigate the effect of temperature on friction in different atmospheric conditions.
To explore the potential for nanomanufacturing applications.

Main Methods:

Utilized cantilever probes with an in situ solid-state heater to vary tip temperatures from 25 ± 2 to 120 ± 20 °C.
Performed friction measurements in air (∼30% relative humidity) and dry nitrogen.
Conducted real-time friction measurements while modulating tip temperature.

Main Results:

Friction increased by a factor of 4 in humid air and decreased by ∼40% in dry nitrogen with heating.
Higher velocities reduced friction in ambient conditions but had no effect in dry nitrogen.
Identified an energy barrier for capillary condensation (0.40 ± 0.04 eV) with slower kinetics during real-time heating.

Conclusions:

Thermally assisted capillary bridge formation in air and thermally assisted sliding in dry nitrogen explain the observed friction trends.
Controlling nanoscale capillary presence allows for tunable friction and adhesion.
This approach offers novel opportunities for tip-based nanomanufacturing.