View Single Post
  #20 (permalink)  
Old 23-May-2007, 07:18 PM
Nereid Nereid is offline
Senior Member
 
Join Date: Mar 2004
Posts: 9,756
Default

Quote:
Originally Posted by Fazor View Post
The thing Fazor seems to be looking at is more:
(impact is energy from 1 m fall)
mass weight acceleration impact

Actually, disregarding impact. Obviously two objects moving at the same velocity with two seperate masses, the object of larger mass has more KE, and more momentum.

What I was looking at is this: If you have a 10-ton safe, and a barstool, both at rest on the gymnasium floor (why a gym, safe, and stool? I dunno I'm random like that): it takes more force to accelerate the 10-ton safe at the same rate as it would to accelerate the bar stool (unless it's one of those rare 10-ton bar stools). But with gravity, the force is the same, yet the resulting acceleration is also the same. That's what I was asking about, but examining the answers, I think I'm just considering gravity in the wrong manner.


The question would be, in the absense of any other gravitational fields, would a 1kg object be attracted to a 10kg object at the same rate that a 10kg object is attracted to a 100kg object? would the 1kg object be attracted to the 100kg object at the same rate as the 10/100? (I know the answer is yes, but the question is why).
Nothing to do with the stong equivalence principle then? After all, safes and bar-stools have different compositions, different mixes of the EM, strong (and weak?) forces ...

Oh dear ... but do you think it's marvellous?
Reply With Quote