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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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Relative Motion Analysis - Velocity01:24

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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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Relative Motion Analysis using Rotating Axes01:25

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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Related Experiment Video

Updated: Jul 31, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Dynamic saccade context triggers more stable object-location binding.

Zitong Lu, Julie D Golomb

    Biorxiv : the Preprint Server for Biology
    |May 10, 2023
    PubMed
    Summary
    This summary is machine-generated.

    Dynamic eye movements (saccades) promote world-centered (spatiotopic) object location binding. Static contexts show eye-centered (retinotopic) binding, but dynamic contexts enable stable spatiotopic representations, crucial for visual stability.

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    Area of Science:

    • Cognitive Neuroscience
    • Visual Perception
    • Computational Neuroscience

    Background:

    • The brain integrates object identity and location rapidly.
    • A key debate exists on how world-centered (spatiotopic) object representations are maintained across eye movements.
    • Previous studies often show eye-centered (retinotopic) effects, even for high-level binding, possibly due to static experimental designs.

    Conclusions:

    • Dynamic saccade contexts can induce stable, world-centered (spatiotopic) object-location binding.
    • This suggests a more flexible brain state in dynamic environments enhances visual stability.
    • Findings challenge previous assumptions by demonstrating context-dependent binding mechanisms.