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Related Concept Videos

Types of Friction Problems01:27

Types of Friction Problems

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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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Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

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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.
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Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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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...
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Frictional Force01:07

Frictional Force

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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...
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Dry Friction01:30

Dry Friction

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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
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Static Friction01:18

Static Friction

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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.
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Updated: Feb 28, 2026

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Squeaking at soft-rigid frictional interfaces.

Adel Djellouli1, Gabriele Albertini2, Jackson Wilt3

  • 1J.A. Paulson School of Engineering and Applied Sciences, Harvard University, Boston, MA, USA. adjellouli@g.harvard.edu.

Nature
|February 25, 2026
PubMed
Summary
This summary is machine-generated.

Squeaking sounds from soft-rigid interfaces are caused by propagating slip pulses, not just stick-slip. Surface ridges can stabilize these pulses, creating consistent squeaking frequencies.

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Area of Science:

  • Tribology
  • Materials Science
  • Acoustics

Background:

  • Squeaking is common in daily life, often attributed to stick-slip friction.
  • Soft-rigid interfaces can detach via slip pulses, but mechanisms at squeaking velocities are unclear.

Purpose of the Study:

  • Investigate the mechanisms behind squeaking at soft-rigid interfaces during high-velocity sliding.
  • Determine the role of slip pulses and geometric confinement in generating squeaking sounds.

Main Methods:

  • Experimental investigation of soft-rigid interfaces at squeaking-inducing velocities.
  • High-speed imaging and acoustic analysis to observe pulse dynamics.
  • Comparison of flat interfaces with those featuring surface ridges.

Main Results:

  • Opening slip pulses propagate at the shear wave speed of the soft material, mediating slip.
  • Irregular pulses in flat samples produce broadband noise.
  • Surface ridges confine pulses, leading to regular frequencies matching the block's shear mode and consistent squeaking.

Conclusions:

  • Squeaking at soft-rigid interfaces is driven by structure-stabilized slip pulse propagation.
  • Geometric confinement transforms irregular dynamics into coherent pulse trains, explaining frequency generation.
  • Findings offer insights into frictional rupture in engineered and natural systems.