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Related Concept Videos

Weightlessness01:01

Weightlessness

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...
Acceleration due to Gravity on Other Planets01:24

Acceleration due to Gravity on Other Planets

The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
Variation in Acceleration due to Gravity near the Earth's Surface01:20

Variation in Acceleration due to Gravity near the Earth's Surface

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.
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
Rigid Body Equilibrium Problems - II01:21

Rigid Body Equilibrium Problems - II

A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
Principle of Equivalence01:18

Principle of Equivalence

According to Albert Einstein (1897-1955), free-falling and feeling weightless are intrinsically linked. If a person were in free-fall under gravity, for example, diving towards the Earth from an airplane, they would feel completely weightless. Similarly, a person descending in a lift may feel partially weightless. Broadly speaking, it is assumed that an object in a uniform gravitational field and an object undergoing constant acceleration in the absence of gravity are under the same...
Rigid Body Equilibrium Problems - I00:49

Rigid Body Equilibrium Problems - I

A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.

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Related Experiment Video

Updated: May 14, 2026

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology
13:59

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology

Published on: November 13, 2014

[Biological experiments in microgravity: equilibrium function].

G I Gorgiladze, A A Shipov, E Horn

    Aviakosmicheskaia I Ekologicheskaia Meditsina = Aerospace and Environmental Medicine
    |February 14, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Organisms adapt to microgravity by altering their equilibrium organ (EO), experiencing behavioral changes like ataxia. Readaptation to Earth

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    Last Updated: May 14, 2026

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    Published on: May 23, 2011

    Area of Science:

    • * Comparative physiology and neuroscience.
    • * Gravitational biology and space medicine.

    Background:

    • * Terrestrial organisms rely on gravity for spatial orientation and motor control.
    • * Microgravity disrupts the body-environment schema processed by the central nervous system.

    Purpose of the Study:

    • * To review structural and functional changes in the equilibrium organ (EO) across diverse species under microgravity.
    • * To analyze adaptive strategies and readaptation processes to Earth's gravity.

    Main Methods:

    • * Review of investigations on invertebrates and vertebrates at various life stages.
    • * Analysis of responses to microgravity and subsequent readaptation to 1 g.

    Main Results:

    • * Microgravity induces ataxia and altered graviceptor afferentation, leading to sensitization and eluding phases.
    • * Readaptation to 1 g is prolonged (days to 50 days) and involves ataxia and vestibular changes.
    • * Equilibrium organ inertial mass changes with gravity, indicating its developmental relevance.

    Conclusions:

    • * The equilibrium organ undergoes significant modifications in microgravity, impacting motor control and sensory processing.
    • * Age influences the gravitosensory system's response to microgravity, highlighting developmental plasticity.
    • * Gravity plays a crucial role in the development and function of the equilibrium organ.