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Related Concept Videos

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.
However, if two systems are in contact and are stationary relative to one...
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When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...
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Frictional Force01:07

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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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Kinetic Friction01:26

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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
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Frictional Forces on Flat Belts01:28

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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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Static Friction01:18

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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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Related Experiment Video

Updated: Jan 1, 2026

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Mid-Air Action Contributes to Pseudo-Haptic Stiffness Effects.

Takahiro Kawabe

    IEEE Transactions on Haptics
    |December 28, 2019
    PubMed
    Summary

    Pseudo-haptic feedback, simulating touch through vision, was tested in mid-air actions. Researchers found that manipulating visual deformation ratios can effectively render perceived object stiffness without physical contact.

    Area of Science:

    • Human-Computer Interaction
    • Haptic Feedback
    • Virtual Reality

    Background:

    • Pseudo-haptic feedback leverages cross-modal integration between vision and haptics.
    • Previous research demonstrated stiffness rendering using external haptic inputs.

    Purpose of the Study:

    • To investigate the feasibility of pseudo-haptic stiffness rendering during mid-air actions without external haptic input.
    • To explore the influence of visual deformation parameters on perceived stiffness.

    Main Methods:

    • Participants performed mid-air hand movements simulating object stretching.
    • Visual object deformation magnitude was synchronized with hand motion.
    • Key parameters manipulated included the deformation-to-distance ratio and Poisson's ratio.

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    Related Experiment Videos

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    Main Results:

    • Perceived object stiffness decreased as the deformation-to-distance ratio increased.
    • Higher Poisson's ratios led to a greater perceived vertical deformation and lower stiffness rating.
    • A significant correlation was found between visual deformation parameters and reported stiffness.

    Conclusions:

    • Pseudo-haptic stiffness can be effectively rendered through mid-air interactions by controlling visual deformation cues.
    • This study demonstrates a novel approach to virtual haptic feedback without requiring physical contact.