Falling Objects
Falling Objects - Related Videos
01:05
Free-falling Bodies: Example
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2023
An object falling without any air resistance under the influence of gravitational force is said to be in free-fall. For free-falling bodies, the acceleration due to gravity is constant, irrespective of their mass. Free-fall is experienced not only by objects falling downward, but also by all objects whose motion is influenced by gravitational force alone. The dynamics of free-fall motion can be calculated using kinematic equations of motion, since free-fall acceleration is constant. The...
01:07
Free-falling Bodies: Introduction
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2023
All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is not the case.
14:38
Creating Objects and Object Categories for Studying Perception and Perceptual Learning
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Cited by 12 •
2012
We describe a novel methodology for creating naturalistic 3-D objects and object categories with precisely defined feature variations. We use simulations of the biological processes of morphogenesis and phylogenesis to create novel, naturalistic virtual 3-D objects and object categories that can then be rendered as visual images or haptic objects.
10:14
Object Substitution Masking
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Visual masking is a term used by perceptual scientists to refer to a wide range of phenomena in which in an image is presented but not perceived by an observer because of the presentation of a second image. There are several different kinds of masking, many of them relatively intuitive and unsurprising. But one surprising and important type of masking is called Object Substitution Masking. It has been a focus of research in vision...
05:55
Multiple Object Tracking
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University In a staggeringly complex and engaging world, it is crucial to selectively process some stimuli at the expense of others. Experimental psychologists call this ability attention. Specifically, visual attention refers to the ability to selectively process aspects of a visual scene. Many paradigms used to study visual attention involve brief, punctuated, and repeated trials. However, everyday situations often place sustained demands...
FAQs
The key distinction is whether air resistance is negligible. In ideal free fall, gravity produces nearly constant downward acceleration near Earth’s surface. In real motion, drag opposes the downward movement and reduces the net acceleration. As a result, an object may no longer continue accelerating at the ideal rate, especially as its speed increases.
Terminal velocity occurs when air resistance grows enough to balance the object’s weight. At that point, the opposing forces produce no further acceleration, so the object continues downward without increasing its speed. This condition explains why real falling motion can differ substantially from the idealized model that considers gravity without significant drag.
Analysis centers on displacement, velocity, acceleration, mass, and force. Displacement describes the object’s change in position, velocity describes its motion, and acceleration indicates how velocity changes. Considering mass and force helps connect the object’s motion to the gravitational influence and to opposing effects such as air resistance.
A mechanics experiment can examine a falling object by relating its displacement, velocity, and acceleration to the forces acting on it. Comparing observations with the nearly constant gravitational acceleration expected near Earth helps identify departures caused by air resistance. The results can distinguish ideal free fall from real-world motion and reveal whether drag affects the outcome.
The relationship between displacement, velocity, and acceleration provides a basis for estimating how long an object takes to reach a lower position. Including gravity gives an idealized prediction, while accounting for air resistance can make the estimate more representative of real motion. Such analysis supports evaluations of when a falling object may reach an impact point.
Parachute analysis depends on understanding how air resistance opposes weight and can eventually limit downward speed. Designers can therefore examine how drag changes acceleration and affects terminal velocity. The same reasoning informs safety systems, where predicting motion and impact conditions helps evaluate how falling bodies behave under idealized and more realistic conditions.
The same relationships among gravity, force, acceleration, velocity, and displacement extend beyond a simple downward fall. They help frame the motion of projectiles and provide a basis for understanding bodies moving under gravity in celestial settings. Studying falling objects therefore introduces mechanics concepts that apply across laboratory experiments, engineered systems, and broader physical motion.