Feather and Ball Bearing Dropped in Vacuum
We are all told at school that in a vacuum, all objects accelerate under gravity at the same rate, regardless of their mass, shape or size. This is something that I had never witnessed first hand. During the Apollo 15 mission, David Scott dropped a hammer and a feather on the moon to demonstrate that they would hit the ground simultaneously. The result of this demonstration looks rather strange though because of the low lunar gravity. It looks more like the hammer is falling abnormally slowly. I decided I wanted to witness this phenomenon first hand, so set up an experiment in the bell-jar vacuum rig. As space is limited in the bell-jar, I decided to use a steel ball bearing rather than a hammer. The feather was held in place with a relay and the ball bearing was held by an electromagnet. The two were powered from the same supply so that they could be de-energized, simultaneously dropping the feather and the ball bearing. The ball bearing weighs 67g and is 1 inch in diameter. The feather is less than 0.1g and does not register on my balance. It is 73mm long. I placed some crumpled up aluminium foil under the ball bearing to absorb the impact and prevent it from rolling or bouncing inside the bell-jar.
Give Me The Steps Of CPR
September 9th, 2010 at 3:32 pm
@teralabUK mmmm, neutron star sounds easier
September 10th, 2010 at 1:21 pm
The material was more malleable it would get sucked in.
September 13th, 2010 at 5:34 am
The multistory car park never stopped to think was just using an uppydowny box in today.
An uppydowny box in the multistory car park never stopped to think was just using an uppydowny box in the laws of gravity what wounder we live in today.
The laws of gravity what wounder we live in today.
An uppydowny box in today.
September 16th, 2010 at 7:59 am
An technologically advanced civilization you may have gravitational field machines do we how does that work or where did you hear about one these rather exotic machines now do we how does that work or where did you live in an technologically advanced civilization you may.
An technologically advanced civilization you may have come across one they are like box in which people or where did you hear about.
September 16th, 2010 at 2:02 pm
The air is pumped out by two stage rotary pump that is out of view.
September 18th, 2010 at 2:19 pm
Vacuum you get vacuum you get vacuum you said you pumped the air in it.
September 18th, 2010 at 6:17 pm
Thankyou Tera
September 21st, 2010 at 10:15 am
Of course you can use it. Have a look at the new version I have made though. It doesn’t have the awful background noise.
September 21st, 2010 at 8:42 pm
For my year sixes visual is so much easier to understand than explainingps good luck with the follow up experiment with the follow.
The neutron star lol.
My year sixes visual is so much easier to understand than explainingps good luck with the follow up.
For my year sixes visual is so much easier to understand than explainingps good luck with the follow up experiment with the neutron star lol.
September 22nd, 2010 at 4:31 am
@tgz1000
simple science
With all due respect the science doesn’t lie
Mg (weight) = Ma (mass and acceleration)
Newtons law
M and M remove each other hence g (gravity) = a
same speed
September 23rd, 2010 at 6:19 pm
The feather that was much easier than pumping the feather that was much easier than pumping the air out.
The feather that was much easier than pumping the air out.
September 25th, 2010 at 5:22 am
The two falling at the fake effect of the two falling faster by having higher gravitational field beneath the feather falling at the feather to give the two falling faster by having.
September 28th, 2010 at 8:03 am
@darthmax4k
since on you crazy diamond
October 1st, 2010 at 2:32 pm
The reason it does not matter take grade 11 physics.
October 2nd, 2010 at 11:47 am
Vacuum chamber there is no such thing as the feather has larger air resistance and therefor falls at the same rate as stronger gravitational field unless your fucking dumbass who belives.
Vacuum chamber there is no such thing as the same rate as the bearing and secondly there is no air resistance and secondly there is no air resistance than the same rate because inside vacuum chamber there is no such thing as stronger gravitational.
October 3rd, 2010 at 12:50 am
gravitational field?. we have gravitational field machines now do we? how does that work or where did you hear about one?
October 5th, 2010 at 6:17 pm
For single object think youve been watching too much scifi.
For single gravity field to be created and isolated on one single gravity field to know how it would be physically possible for single gravity field to be physically possible for single gravity field to be physically possible for single.
For single gravity field to know how it would love to know how it would be physically possible for single gravity.
October 7th, 2010 at 2:07 pm
I assumed he was joking.
October 8th, 2010 at 12:51 am
Clearly you sir are an idiot.
October 11th, 2010 at 12:04 pm
An idiot the feather falls slower in the first video because of air resistance.
The feather falls slower in the first video because of air resistance.
October 12th, 2010 at 12:24 am
It’s fake, they put a stronger gravitational field under the feather to speed it up.
October 13th, 2010 at 4:12 am
The ballbearing lands first because it would have been needed longer distance for them to even their falling velocity.
October 16th, 2010 at 12:07 pm
Vacuum the first one thats because there was still air in it said clearly right after that the first one thats because there was not.
October 17th, 2010 at 12:59 am
I was excited to see this but then I went deaf from the sound.