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Related Concept Videos

Rolling With Slipping01:14

Rolling With Slipping

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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.
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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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Related Experiment Video

Updated: Sep 19, 2025

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
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Surface Rolling Active Magnetic Emulsions.

Muhammad Turab Ali Khan1, Gaurav Gardi1, Ugur Bozuyuk1

  • 1Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 10, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed active magnetic droplets that can move in fuel-deficient areas using synthetic rotational flows. This allows for controlled locomotion, enabling exploration and manipulation of microscale entities.

Keywords:
chemotaxismicromachinesself‐propelling dropletssurface rollers

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Area of Science:

  • Soft Matter Physics
  • Microfluidics
  • Active Matter

Background:

  • Active emulsions exhibit chemotactic locomotion in fuel-rich environments, mimicking biological systems.
  • Controlling droplet motion and achieving locomotion in fuel-deficient conditions remains a significant challenge.

Purpose of the Study:

  • To engineer active magnetic droplets with on-demand surface rolling ability for locomotion in fuel-deficient environments.
  • To enable switchable locomotion modes for enhanced exploration and manipulation capabilities.

Main Methods:

  • Incorporation of synthetic rotational flows generated by encapsulated magnetic clusters within oil droplets.
  • Integration of autonomous and synthetic flows to achieve switchable locomotion modes.

Main Results:

  • Demonstrated droplet locomotion in fuel-deficient regions via synthetic rotational flows.
  • Achieved switchable locomotion between surface rolling and autonomous swimming.
  • Enabled active magnetic droplets to navigate confined spaces, avoid traps, and enter narrow regions.

Conclusions:

  • The developed active magnetic droplets offer precise control over motion, overcoming limitations of fuel-deficient environments.
  • Switchable locomotion modes allow for advanced navigation and manipulation of micro/nanoscale entities against chemotactic gradients.