wow this thread went deep. but fascinating. as far as gravity we are all taught that dropped objects fall at the same rate, in a vacuum. prooven on the moon, hawks feather and hammer. but what I think is really interesting is two things
1 objects of different masses roll at different velocities down an incline, the heavier one always will win.
2 no one ever goes into the impact that the object makes when you drop them. what i mean is, yes they fall at the same rate, but one for sure makes a bigger whole in what ever it hits. same speed, more energy.
cam

You may have hit the nail on the head.  This is how I was thinking also, just wasn't able to find the right words or illustration. Speed, velocity, and momentum changes the way we think about this. You're right about this being deep.  I feel like I'm chasing the wind.

If you're driving while writing on your cellphone, then you may experience gravity in your own way and know it very well.  This is what we do in the USA, LOL.

If you mean, dropping a ball with the same mass of the earth, then it will take half the time than the balls with little mass?  I believe it has to do with both the speed and momentum. 

Will someone please set both of us straight......LOL

I "never" write on my cellphone when I drive. This time a actually had a fully controlled stop before I wrote 

Well. The acceleration of gravity on earth is about 9,81m/s². On the moon it is about 1/6 of the earth gravity. The earth, or the moon, have the dominant mass compared to a hammer, a feather or Newtons apple. I am however not completely sure about my previous statement. That greater mass in a bowling ball compared to a marble ball takes also more energy to accelerate. So that might be the main reason why they fall down to the ground in the same speed. However, the increased mass of the bowling ball should also affect the acceleration of gravity, and should increase it a small bit. So the bawling ball should hit the ground just a tiny-tiny fraction of a microsecond before the marble ball. You need a great deal of decimals to calculate the difference, but we can make a try:

Weight of the earth is approx 6,000,000,000,000,000,000,000,000 kilograms.
Bowling ball: 3kilograms?
Marble: 5 grams?

OK, the equation: 6000000000000000000000003 kilograms / 6000000000000000000000000,005 kilograms = 1,0000000000000000000000004991667

So the bowling ball falls 1,0000000000000000000000004991667 times faster. After 10 seconds fall it hits the ground 0,00000000000000000000004991667 seconds earlier. Not much to measure with a stop watch

Br.

Vidar

maybe rolling fown an incline instead of falling, exagerates the effect of gravity??? thats why the heavy one wins? but the physics is, the heavier one has a higher moment of inertia, sooo. ..... I think they are not related?? hmmmm
cam

The rolling example must concider friction due to the ground pressure and the friction as a cause of that. Small objects vs. big objects, made of the same matter and having the same surface structure, rolling on the same track, in the same air, will meet relatively more friction through aerodynamic issues and friction between the balls surface structure and the track. Small enough particles can even be trapped in a focused laser beam and let it be guided wherever I want it to go through space. That is as close to antigravity I have got. However we are talking about forces in less than pico Newtons - not three kilograms.

 Just see here where I focused a 16x DVD burner laser into plastic. The vapour molecules is trapped and locked in the focuspoint, and I can guide the molecules where I want. Power is about 300mW. (I am "jallaguri" on YouTube):

http://www.youtube.com/watch?v=ig_L3PnSuo0&feature=channel

http://www.youtube.com/watch?v=9AzdMJSvuUU&feature=channel

http://www.youtube.com/watch?v=pHx5312UxII&feature=channel

Try this with a bowling ball - you need  at least 1 x 10¹⁸ W pr cm² - I mean plenty of power to trap that ball in a laser beam.

Br.

Vidar

No comments on the dolphin/bubble ring video?  I realize this may not be new, but I find this truly fascinating.  I guess the video speaks for itself. 

Cool dolphin video
Optical trapping isn't new either - btw. But it's nevertheless fascinating to be able to catch particles and hold them in place with light. Maybe the photons, or radiation, controlls gravity?

this is really really neat. once i got involved with the inventor and his ideas, it opened my mind up to a gyroscope / gimble  came up with.
To answer gravity first, from what i can see, it looks like they are trying to use the inertial effects of multible flywheels, we commonly see this as a gyroscope. the only problem i see with the one shown is, and someone brought it up earlier in this thread is, you need a uni directional force. this one appears to be a plurality of directions, no bonus in one direction. as far as using angular momentum.... this is still like a compination of flywheels as far as i can tell. (unfortunatley without further transparency with my motor, most people think the same thing) but...........
I guess the following will be my first honest attempt at open sourceing an idea.

I came up with what I called a directional gimble / gyroscope.

It works like this, ill try to be as clear as possible. i have cad drawings i can put too if needed.
take the inner ring of a gyro, and make it gimble, what i mean is it can freely spin, not end over end, but like a clock. now place a weight on it. so now if it were to spin, it would wobble really bad.
now take the next outer ring, here the timing would be crucial, it allows the inner ring to turn end over end. you make the timing so that ... try to visualize this, if the weight on the inner ring is at 9 oclock and moving clockwise toward 12 than 3 but the second ring keeps flipping the inner ring over end over endr, the weight would follow a path like 9, 12, 3, 12, 9, 12, 3... and so on. so the angular addition of the weight is always on the plane above 9 and 3. wouldn't that produce a unidirectional force???
has any one ever seen or tried to build this.
cam

rocker arms on car motors that rev as high as 18K rpm with pistons that weigh a couple of pounds dont rip off.

A Gyro Compass is a cool thing to work with, it is based on similar principles and you occasionally can find one on ebay.
http://www.navis.gr/navaids/gyro.htm

Since your not able to visualize anything more than a compass, then you always have the option to navigate yourself to ebay.