source: wikipedia_enIn classical mechanics, free fall is any motion of a body where gravity is the only force acting upon it.
A freely falling object may not necessarily be falling down in the vertical direction. If the common definition of the word "fall" is used, an object moving upwards is not considered to be falling, but using scientific definitions, if it is subject to only the force of gravity, it is said to be in free fall. The Moon is thus in free fall around the Earth, though its orbital speed keeps it in very far orbit from the Earth's surface.
In a roughly uniform gravitational field, gravity acts on each part of a body approximately equally. When there are no other forces, such as the normal force exerted between a body (e.g. an astronaut in orbit) and its surrounding objects, it will result in the sensation of weightlessness, a condition that also occurs when the gravitational field is weak (such as when the body is far away from any source of gravity).
The term "free fall" is often used more loosely than in the strict sense defined above. Thus, falling through an atmosphere without a deployed parachute, or lifting device, is also often referred to as free fall. The aerodynamic drag fo
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่ช็ฑ่ฝไธใใฆใใ็ฉไฝใๅฟ
ใใใ้็ดๆนๅใซ่ฝไธใใฆใใใจใฏ้ใใพใใใใ่ฝใกใใใจใใไธ่ฌ็ใชๅฎ็พฉใ็จใใๅ ดๅใไธๅใใซๅใใฆใใ็ฉไฝใฏ่ฝไธใใฆใใใจใฏ่ฆใชใใใพใใใใ็งๅญฆ็ใชๅฎ็พฉใ็จใใใชใใฐใ้ๅใฎใฟใซไฝ็จใใฆใใๅ ดๅใใใใฏ่ช็ฑ่ฝไธใซใใใจ่จใใใพใใใใใใฃใฆใๆใฏๅฐ็ใฎๅจใใ่ช็ฑ่ฝไธใใฆใใใจ่จใใพใใใใใฎ่ป้้ๅบฆใๅฐ็ใฎ่กจ้ขใใ้ๅธธใซ้ ใ่ป้ใซ็ใพใใใฆใใพใใ
ใปใผๅไธใช้ๅๅ ดใซใใใฆใฏใ้ๅใฏ็ฉไฝใฎๅ้จๅใซใปใผ็ญใใไฝ็จใใพใใ็ฉไฝ๏ผไพใใฐใ่ป้ไธใฎๅฎๅฎ้ฃ่กๅฃซ๏ผใจใใฎๅจๅฒใฎ็ฉไฝใจใฎ้ใซๅใๅ็ดๆๅใฎใใใชไปใฎๅใๅญๅจใใชใๅ ดๅใ็ก้ๅๆใ็ใใพใใใใฎ็ถๆ
ใฏใ้ๅๅ ดใๅผฑใๅ ดๅ๏ผไพใใฐใ็ฉไฝใ้ๅใฎๆบใใ้ ใ้ขใใฆใใๅ ดๅ๏ผใซใ็บ็ใใพใใ
ใ่ช็ฑ่ฝไธใใจใใ็จ่ชใฏใไธ่จใฎใใใชๅณๅฏใชๅฎ็พฉใใใ็ทฉใใใซไฝฟใใใใใจใใใใใใพใใใใฎใใใใใฉใทใฅใผใใๆ้่ฃ
็ฝฎใๅฑ้ใใใซๅคงๆฐไธญใ่ฝไธใใ็ถๆณใใใใฐใใฐ่ช็ฑ่ฝไธใจๅผใฐใใพใใ็ฉบๆฐๆตๆใฏ