about a feather and aball when the fall from the same hight to the groun on the moon?

Question

some people say they will hit the ground at the same time,because there is no air resistance on the moon,so what about the mass of the objects can it be nigligible?

Answer 1

A heavier object is affected more by gravity but a heavier object is also harder to move. So if you disregard air resistence, things fall at the same rate. (There is obviously no air on the moon).
Even on Earth if you dropped a very heavy lead ball and a light hollow aluminium ball, if they were the same size and shape, they would land at the same time.

Answer 2

The point of Galileo's experiments with dropping different weights was to show that they all take the same amount to fall, regardless of mass. The only exception would be if one of the objects was so light it was disturbed by air resistance - such as a feather.

Hence, it is certain that if you dropped a feather and a ball on the moon, where there is no air resistance, they would definitely hit the ground at the same time.

The mass isn't so much "negligible" as irrelevant.

Answer 3

It isn't that the mass is negligible, it's just that gravity produces the same acceleration of any object, irrespective of its mass. (In the case of the moon, that's about 1.6 m/s/s).

Reason is that the force F due to gravity is proportional to mass m, but so is the inertia of the object and they cancel out. In symbols,
F=m.a or a = F/m.

Answer 4

Gravity has the same accelerating force regardless of mass.

Answer 5

Funnily enough such an experiment was carried out on the moon - although with a hammer and a feather.

Check it out at

http://uk.youtube.com/watch?v=5C5_dOEyAfk

Answer 6

mass isnt the matter in this case

Answer 7

In space there is no gravity hence mass is irrelevent.