在moon ,點解會輕咗???

我地有一條公式: W=mg
W是weight，m是mass
g是地心吸力，地球上的g值是9.8，這個9.8是經過科學家做實驗得出來的，代表在沒有任何空氣阻力下，物體會以每秒9.8m/s的速率加速

G值亦代表重力
由於月球上的地心吸力只有地球的六份之一，在mass不變的情況下，
W=(m)(9.8/6)
因此W得出的數值會是細了6倍，而我們會感覺到自己輕了。

因為月球既引力較地球等 所以在月球重量少了 但質量不變

因為 W=mg
係地球的g>月球的g
所以在月球會覺得輕左

All masses produce a gravitational field. The larger the mass the stronger its gravitational field. Earth is larger in mass than Moon.

Gravitational field strength, g, of a planet:
g = GM/r^2 G is Newton's Universal Gravitational Constant; M is the mass of the planet; r is the radius of the planet

The strength of the Earth's gravity at its surface is 9.8 N/kg. This means that a mass of 1 kg will be attracted to the Earth with a force of 9.8 N.
The strength of the Moon's gravity at its surface is 1.6 N/kg. A mass of 1 kg will have a weight of 1.6 N on the Moon.

A person weight 70kg can feel 70x 9.8N force on earth; but he can feel only 70 x 1.6N force on moon.

2008-11-30 20:53:04 補充：
If a planet Mass is less than Earth, but the radius is very small, it's gravitational field strength can be larger than that of the the Earth.

因為月亮既質量比地球少,所以,地深吸力就會大d,所以就會覺得輕左.