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Related Concept Videos

Apparent Weight and the Earth's Rotation01:28

Apparent Weight and the Earth's Rotation

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Since all objects on the Earth's surface move through a circle every 24 hours, there must be a net centripetal force on each object, directed towards the center of that circle. The points of the north and south poles are the only exception to this rule.
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True weight is the measure of the gravitational force acting on an object. However, if the object accelerates, its measured weight is different from its true weight. Similar observations can be made when the object is submerged in water. An object's weight in water is its apparent weight, which is equal to the difference between its true weight and the buoyant forces.
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Variation in Acceleration due to Gravity near the Earth's Surface01:20

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An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
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Weightlessness01:01

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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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Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
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Second Law: Motion under Same Force01:10

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Newton's laws can be applied to bodies at rest and bodies in motion. Newton's first law is applied to bodies in equilibrium, whereas the second law applies to accelerating bodies. To study accelerating bodies, first, the directions and magnitudes of acceleration and the applied forces are determined. Then, the free-body diagram is constructed, and Newton's second law is applied, considering the components of the forces in the x and y directions.
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Updated: Mar 21, 2026

Visualization Method for Proprioceptive Drift on a 2D Plane Using Support Vector Machine
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Individualistic weight perception from motion on a slope.

K Zintus-Art1, D Shin1, H Kambara1

  • 1Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Japan.

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|May 14, 2016
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Summary
This summary is machine-generated.

Human weight perception is not universal; individual experiences and environmental factors like slope inclination significantly influence how we perceive an object's weight during motion.

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Area of Science:

  • Cognitive Neuroscience
  • Human Perception
  • Virtual Reality Studies

Background:

  • Object weight perception is generally understood to correlate with motion characteristics.
  • Previous research indicated universal consistency in weight-motion perception during passive observation in horizontal and vertical planes.

Purpose of the Study:

  • To investigate the relationship between sliding motion and weight perception in a controlled virtual environment.
  • To determine if motion-weight pairings in perception are universally identical or individually distinct.

Main Methods:

  • Utilized a virtual environment enabling participants to control slope steepness.
  • Assessed subjective weight perception in relation to varying motion parameters like inclination and surface texture.

Main Results:

  • Demonstrated that individuals exhibit distinct, subjective motion-weight relationships in perceptual judgments.
  • Identified that environmental parameters (inclination, surface texture) and individual factors (experience) modulate weight perception.

Conclusions:

  • Challenges the notion of universal consistency in motion-weight perception, highlighting individual variability.
  • Suggests the central nervous system dynamically selects and integrates internal models based on sensory input.
  • Indicates potential for manipulating human perception through targeted sensory cueing to influence internal model mechanisms.