Search Results - Zero gravity
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Weightlessness is a phenomenon experienced by people during free-fall. Although the term zero gravity is often used as a synonym, weightlessness in orbit is not the result of the force of gravity being eliminated or even significantly reduced (in fact, the acceleration towards Earth due to gravity at an altitude of 100 km is only 3% less than at the Earth's surface). Weightlessness typically occurs when an object or person is falling freely, in orbit, in deep space (far from a planet, star, or other massive body), in an airplane following a particular parabolic flight path (e.g., the " Vomit Comet"), or in one of several other more unusual situations. Generally speaking, weightlessness occurs when a person (or object) is subject to (at most) a single, uniformly distributed force (typically gravity), or is not acted upon by any accelerating force. This is in contrast with typical human experiences in which a non-uniform force is acting, such as Gravity is a field force which acts uniformly on the mass of all people and objects in the frame of reference. In cases where an object is not weightless, as in the above examples, a second force acts non-uniformly on the person or object in question. Aerodynamic lift, drag, and thrust are all non-uniform forces (they are applied at a point or surface, rather than acting on the entire mass of an object), and thus prevent the phenomenon of weightlessness. This non-uniform force may also be transmitted to an object at the point of contact with a second object, as in the contact between the surface of the Earth and one's feet, or between a parachute harness and one's body. In the case of a spacecraft in orbit around the Earth, the force of gravity acts uniformly on the spacecraft and on its occupants; thus, occupants experience weightlessness. If a secondary force acts directly on the spacecraft (such as rocket thrust or atmospheric drag), it is transmitted through the structure of the vehicle to its occupants, and the occupants do not experience weightlessness.
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Showing 1 to 9 of 9 Articles matching 'Zero gravity' in related articles. |
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1. Bowflex Revolution: From Outer Space to Your Living Room - The Advantages of Zero Gravity Technology
April 20, 2008
For those who have frequented workout gyms, the name 'Nautilus' will be a familiar one. Their machines are a common component of most modern gyms, and have been since their introduction in the early '80s. Bowflex is the home gym component of Nautilus, and the latest entrant into this market is the Bowflex Revolution, a compact and relatively lightweight fitness machine designed as an all-in-one machine for home use. What makes the Bowflex Revolution unique is the new patented Spiraflex technology, originally designed for use in space, where traditional weight resistance doesn't work. Most... (read more)
Author: Brent Craig
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2. Juvent Dynamic Motion Therapy Platform
January 12, 2008
Could a new technology, selected by NASA for use on next year's Space Station to assist astronauts to build bone in a zero gravity situation, help someone stationed here on earth? I decided to check this out for myself.
I recently had the opportunity to try the Juvent 1000 Dynamic Motion Therapy (DMT) Platform.
The device resembles a bathroom weight scale and generates vibrations through the soles of your feet. The fast and gentle vertical accelerations that the platform emits produces tiny stresses. Researchers believe that these stresses stimulate the bones to grow stronger. ... (read more)
Author: Margaret Martin
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3. Ignite the Night: A Night at The Zero Gravity Circus Benefits Street Kids in Peru
December 12, 2007
"Tonight a dream has come true", said G.A.P Adventures CEO and founder Bruce Poon Tip. About a year ago he and a few of his team members at the Planeterra Foundation, G.A.P’s non-profit organization, sat together and brainstormed about a big fundraising event until someone said “Let’s throw a circus”.
Well, and a circus they threw last night….. Zero Gravity Circus provided 2.5 hours of jaw-dropping colorful and amazing entertainment, the more-than-capacity crowd at the Hall at Toronto’s downtown Steamwhistle Brewery was in absolute awe and cheering wildly.
When I got there at 7 pm t... (read more)
Author: Susanne Pacher
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4. The Sun Causes Lunar Tides
July 24, 2007
Is it not a heresy to say that the moon’s gravitational pull, moves millions of tons of seawater (tides) from so far away a distance, were we all know, that the moon could not even hold its own atmosphere?
And likewise, why do satellites in zero gravity space orbit around the earth, do not also get pulled by the moon’s gravitational force when these satellites are much closer to the moon than the oceans are?
According to conventional science, the tides at a given place in the earth’s oceans occur about an hour later each day. Since the moon passes overhead about an hour later each da... (read more)
Author: Roger Rogers - Jesian
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5. The Secret to Beating Very Athletic Teams in Youth Football
May 16, 2007
Playing in Space is the key term.
We aren't talking about playing football on the moon, zero gravity would make us all have to rethink the game quite a bit. "In Space" means playing with distance between your players and the other team. If your team is bigger and more athletic and can handle the other teams players one on one, you want space, it is your friend. However, if you don't have bigger and better athletes than the other team, space is your enemy.
Playing "In space" means just what it says, putting your players with space in-between them and the opposition. If your team i... (read more)
Author: dave cisar
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6. Water-Friendly Workouts
February 26, 2007
Did you know that a 150-pound woman weighs a mere 17-pounds in the water?
This is because of the water’s buoyant effect on the human body. This lack of gravity in water is why so many people with joint and muscle pain, and those who are extremely obese, turn to aqua fitness to get their health back. Water fitness is extremely gentle because it cushions the body, putting zero stress on weight-bearing joints and muscles. As a result, aquatic workouts are extremely low-impact and can greatly reduce the chances of further injury and strain - that the same exercises out of water can actually i... (read more)
Author: Anna Fleet
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7. Ocean View Beach Lounger: The Ultimate Zero Gravity Beach Chair
September 05, 2006
The Ocean View Beach Lounger is a beach lounge chair that offers you instant comfort so you can relax and recline into the doctor recommended Zero Gravity position.
Looking for a beach lounge chair so that you can enjoy the outdoors in comfort? Looking for a comfortable way to sit on the beach? Well look no further. Our Ocean View Beach Lounger is the best under the sun. Imagine sitting on the beach in your Ocean View Lounger with the crashing waves; people passing by; and you are reclined into the zero gravity position watching the crashing waves in total relaxation. The lounge beach c... (read more)
Author: Sari El-Dajjani
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8. Fasteners: An Overview
March 29, 2006
Fasteners are the pervasive and unseen force holding our industrial world together. Only gravity can claim a greater responsibility for keeping things together. When one speaks of fasteners, one refers to all manner of screws, bolts, anchors, Velcro, threaded bars, and so on. Fasteners hold two or more objects in place, with the aim of allowing zero movement. A fastener joins two things as one. You might sometimes wonder: why don’t people just build things as one piece in the first place? Why use the middleman of fasteners? The answer is that not everything is small enough to erect, ship, or ... (read more)
Author: Peter Emerson
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9. Fasteners: An Overview
March 01, 2006
Fasteners are the pervasive and unseen force holding our industrial world together. Only gravity can claim a greater responsibility for keeping things together. When one speaks of fasteners, one refers to all manner of screws, bolts, anchors, Velcro, threaded bars, and so on. Fasteners hold two or more objects in place, with the aim of allowing zero movement. A fastener joins two things as one. You might sometimes wonder: why don’t people just build things as one piece in the first place? Why use the middleman of fasteners? The answer is that not everything is small enough to erect, ship, or ... (read more)
Author: Peter Emerson
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