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Rolling Without Slipping01:09

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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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Flat belts are commonly used in various industrial applications for transmitting power from one pulley to another. When a flat belt is wrapped around a set of pulleys, it experiences different tensions at the driving pulley ends due to the friction between the belt and pulley surface. When the pulley moves in a counterclockwise direction, the tension T2 on the opposite side of the pulley where the belt is moving away from is higher than the tension T1 on the side where the belt is moving...
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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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Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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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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Updated: Jan 14, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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SpinTexture: Exploring Scanning Realism From Concentric to Uni-Directional Slip Feedback Using a Spinning Textured

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    Concentric rotation feedback in virtual reality (VR) offers realistic texture scanning comparable to traditional methods. This compact haptic technology shows promise for smaller VR devices.

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    Area of Science:

    • Virtual Reality (VR)
    • Haptic Technology
    • Human-Computer Interaction

    Background:

    • Traditional haptic devices offer unidirectional skin-slip feedback for VR texture scanning but are often bulky.
    • Concentric rotational feedback presents a compact alternative but requires comparison with existing methods for realism.

    Purpose of the Study:

    • To investigate if concentric rotational feedback can achieve scanning realism comparable to unidirectional skin-slip feedback.
    • To evaluate the impact of contactor size and rotational feedback on the virtual reality haptic experience.

    Main Methods:

    • Designed a custom haptic device enabling adjustable center distance between the fingerpad and a rotating textured disk.
    • Synchronized disk rotation speed with user scanning motion for controlled experiments.
    • Conducted three user studies using sandpaper and silk textures to assess scanning realism.

    Main Results:

    • Variations in the radial distance of finger contact from the disk's rotation center did not significantly affect scanning realism.
    • Concentric rotational feedback demonstrated comparable scanning realism to unidirectional feedback.
    • The custom device proved effective in simulating texture scanning sensations.

    Conclusions:

    • Fingertip-sized concentric rotational feedback is feasible for realistic VR texture scanning.
    • This compact haptic approach is suitable for VR applications prioritizing a small form factor.
    • Findings suggest potential for concentric feedback in other haptic devices needing miniaturization.