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originally posted by: WeAre0ne
You still don't understand... Holy @#$%!
The downward force that prevents the tube from jumping once it is already in the air is the force provided by the downward movement of the tube. That force does not exist when the device is on the ground, because the tube can not move downward, it is resting on the ground!
How do you not understand this?
You didn't simplify or break down anything. You can't simplify or break down something you don't understand.
originally posted by: tachyonator7
you claim there is a downward force (from the top of a spring contracting) which is CANCELED OUT by the ground, but you somehow imagine this force CANCELED OUT by the ground doesn't excert force on the ground pushing against it. LOL, i am laughing writing this..
originally posted by: tachyonator7
further you claim, once the tube is in the air, this same force now magically does create downward movement of the tube, the same force that didn't push downward a moment before.
originally posted by: tachyonator7
tell me you are trolling, cause this is beyond stupid, not only you have no idea what you are talking about, this is pure insult to intelligence anywhere, anywhen.
It doesn't exert any EXTRA force. They key word here is EXTRA. Why do you keep ignoring that word? There is already a downward force being exerted on the ground when it is stationary (action force), and an equal and opposite upward force (reaction force). Watch this video here at 1:46 to understand that.
IWhen the spring is released, the top half of the spring has a contracting force that wants to pull down the tube. When on the ground, it can't pull down the tube because the tube is resting on the ground experiencing the action and reaction force from the ground. So instead of pulling down the tube, that contracting force from the spring pulls the center of the spring upward. The contracting force of the spring is not canceled... if it was, the spring would not fully contract. The force that is canceled is the force that would be present if the tube was able to move... inertia.
When in the air, the downward contracting force of the spring can move the tube down because its not stopped by the ground. So when the tube is moving downward, inertia is present. That downward inertia cancels out any upward force from the spring, causing the device to not move at all, because the two up and down forces cancel each other out. They are equal and opposite.
originally posted by: tachyonator7I agree that this is beyond stupid... I have explained the same thing more than 5 times and you still don't understand, and that is causing you to project your own lack of understanding onto others.
originally posted by: tachyonator7
furthermore, let's put the tube on the wheels. ... it moves in one direction, of course.
originally posted by: tachyonator7
you called that an experiment? cart didn't move at all.
For every action, there is an equal and opposite reaction.
originally posted by: GaspodeThat was the whole point of his experiment - to show that Newton's 3rd law states that your theory is bunk.
To recap:
For every action, there is an equal and opposite reaction.
A forward and a backward force, cancelling each other out causing the cart to 'not move at all'.
Physics 101. So his experiment was 100% a success. Or at least 99%.
originally posted by: tachyonator7
you called that an experiment? cart didn't move at all.
originally posted by: tachyonator7
it didn't move because he used a weak spring on a heavy cart.
originally posted by: tachyonator7
i already shared the video of a successful experiment. here it is again: www.youtube.com...
originally posted by: NAVSEAAs you can see in the slow motion part of that video, the entire bottle moves backwards before it moves forwards. When it moved backwards you can see the bottle pushed the clothes pin backwards too, then the pin moves forward. The bottle was pushed forward by the clothes pin.
Regards,
NAVSEA
originally posted by: Jonjonj
a reply to: tachyonator7
Here is a simple experiment to try out. Crouch down, then leap into the air, you will experience an uplifting movement and practically sail, free as a bird, for about a second or so. Now, reset whilst in mid air, that is to say, crouch again, in mid air, and jump again. Sadly you may land badly and cause some damage to both knees, ankles, or even face and head, according to how you land. In a vacuum it is less physically dangerous, but the same principal applies.
Now get into a box, a comfortable box...once again, jump up, you may in fact hit the box and create a temporary movement upwards, but I can't see that being sustained either. Even in space.
This has been a fun thread to read.