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التعليقات (5)
swimming
Technique
The human body is 70% water and has a very similar density to water. While the lungs are filled with the air, the body is slightly less dense than the surrounding water, and there is a net upward force on the body. Thus staying afloat requires only a slight propelling of water downward relative to the body, and transverse motion only a slight propelling of water in a direction opposite to the direction of intended motion. This propelling is accomplished by using the hands and forearms as paddles, and by kicking the legs and feet to push water away from the body (though kicking accounts for relatively little thrust). Since salt water (e.g. the ocean) is denser than fresh water (e.g. most swimming pools), less effort is required to stay afloat in salt water than in fresh water.
اذا تبغين زياده عن السباحه .. هذا الرابط
http://en.wikipedia.org/wiki/Swimming#Technique
Technique
The human body is 70% water and has a very similar density to water. While the lungs are filled with the air, the body is slightly less dense than the surrounding water, and there is a net upward force on the body. Thus staying afloat requires only a slight propelling of water downward relative to the body, and transverse motion only a slight propelling of water in a direction opposite to the direction of intended motion. This propelling is accomplished by using the hands and forearms as paddles, and by kicking the legs and feet to push water away from the body (though kicking accounts for relatively little thrust). Since salt water (e.g. the ocean) is denser than fresh water (e.g. most swimming pools), less effort is required to stay afloat in salt water than in fresh water.
اذا تبغين زياده عن السباحه .. هذا الرابط
http://en.wikipedia.org/wiki/Swimming#Technique
2
air sports
Ultralight aviation
During the late 1970s and early 1980s, many people sought to be able to fly affordably. As a result, many aviation authorities set up definitions of lightweight, slow-flying aeroplanes that could be subject to minimum regulation. The resulting aeroplanes are commonly called ultralight or microlight, although the weight and speed limits are rarely the same between any two countries.
There is also an allowance of another 10% on Maximum Take Off Weight for seaplanes and amphibians, and some countries (such as Germany and France) also allow another 5% for installation of a ballistic parachute.
The safety regulations used to approve microlights vary between countries, the most strict being the United Kingdom, Italy, Sweden and Germany, while they are almost non-existent in France and the United States. The disparity between regulations is a major barrier to international trade and overflight, as is the fact that these regulations are invariably sub-ICAO, which means that they are not internationally recognised.
air sports
Ultralight aviation
During the late 1970s and early 1980s, many people sought to be able to fly affordably. As a result, many aviation authorities set up definitions of lightweight, slow-flying aeroplanes that could be subject to minimum regulation. The resulting aeroplanes are commonly called ultralight or microlight, although the weight and speed limits are rarely the same between any two countries.
There is also an allowance of another 10% on Maximum Take Off Weight for seaplanes and amphibians, and some countries (such as Germany and France) also allow another 5% for installation of a ballistic parachute.
The safety regulations used to approve microlights vary between countries, the most strict being the United Kingdom, Italy, Sweden and Germany, while they are almost non-existent in France and the United States. The disparity between regulations is a major barrier to international trade and overflight, as is the fact that these regulations are invariably sub-ICAO, which means that they are not internationally recognised.
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Definition of a sport
Physical activity that is governed by a set of rules or customs and often engaged in competitively.
A particular form of this activity.
An activity involving physical exertion and skill that is governed by a set of rules or customs and often undertaken competitively.
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1
water sports
A water sport is a form of recreation where water is an essential aspect of the activity.
For a list of such sports, divided according the participants' position at, below, or above the surface of the water
surface water sports
Skiing
Water skiing is a sport and recreational activity and is popular in many countries around the world where appropriate conditions exist - an expanse of water unaffected by wave motion. Rivers, lakes, and sheltered bays are all popular for water skiing.
Standard water skis were originally made of wood but now are usually constructed out of fibreglass-based composites. They are of similar length to downhill snow skis but are somewhat wider. Instead of a rigid binding, they have rubber molded binding, in which the skier's feet are placed. Skiers are pulled along by a rope with a handle fitted at one end and attached to a powerboat at the other.