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Author Topic: 'Impossible' rocket drive works and could get to Moon in four hours  (Read 95125 times)

minnie

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #210 on: August 12, 2015, 12:44:22 PM »
The acceleration is in fact at a maximum at that same instant.

Sounds counter-intuitive at first sight but it must be right.

allcanadian

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #211 on: August 12, 2015, 04:54:29 PM »
@Mark E
Quote
For an instant, the velocity is zero.  The acceleration is in fact at a
maximum at that same instant.
When the velocity is zero the acceleration is zero however the force which is the cause of an acceleration is maximum. An acceleration is the rate of change of velocity in (meters per second) per second so if velocity is zero then acceleration is zero because there is no change.
 
On another note in my rush to devise a better way to remove the float in the tube I forgot one small detail. More float means less water, as such we are always losing water and the idea I proposed is unworkable. Any way we look at it the water which is displaced is the water which must be replaced... bummer.
 
AC

gravityblock

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #212 on: August 12, 2015, 07:08:24 PM »
On another note in my rush to devise a better way to remove the float in the tube I forgot one small detail. More float means less water, as such we are always losing water and the idea I proposed is unworkable. Any way we look at it the water which is displaced is the water which must be replaced... bummer.
 
AC

We need a float at the top and at the bottom that are self-synchronized (linked together), similar to this concept.  The tube will go through the bottom float and into the water.  As the water is displaced from the tube, the bottom float will rise and the top float will..... However, when we solve one problem then we create another problem, lol.

Gravock

MarkE

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #213 on: August 12, 2015, 09:56:38 PM »
@Mark EWhen the velocity is zero the acceleration is zero however the force which is the cause of an acceleration is maximum. An acceleration is the rate of change of velocity in (meters per second) per second so if velocity is zero then acceleration is zero because there is no change.
 
On another note in my rush to devise a better way to remove the float in the tube I forgot one small detail. More float means less water, as such we are always losing water and the idea I proposed is unworkable. Any way we look at it the water which is displaced is the water which must be replaced... bummer.
 
AC
F = mA.  Where force is at a maximum, so is the acceleration, even if the velocity is zero.

gravityblock

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #214 on: August 12, 2015, 10:33:48 PM »
F = mA.  Where force is at a maximum, so is the acceleration, even if the velocity is zero.

The force is zero, the acceleration is zero, and the velocity is zero.  Below is a snapshot of the results from an acceleration calculator.  I'm using the Planck time of 10-43 for the time interval in our equation.  However, we can use any time interval and it doesn't change the result.  So, we plug in the calculator's result of 0 into our force equation and we have F = m * 0, F = 0.  Acceleration only applies to a moving object.  Acceleration doesn't apply to a stationary object.  Saying the acceleration is at the maximum is another inversion of the truth.  Saying the Force is at the maximum is another inversion of the truth.

@minnie:  How many times will you allow yourself to be tricked by the same trickster?  Here's my motto, "Trick me once, shame on you.  Trick me twice, shame on me".

Gravock

MarkE

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #215 on: August 12, 2015, 11:01:40 PM »
The force is zero, the acceleration is zero, and the velocity is zero.  Below is a snapshot of the results from an acceleration calculator.  I'm using the Planck time of 10-43 for the time interval in our equation.  However, we can use any time interval and it doesn't change the result.  So, we plug in the calculator's result of 0 into our force equation and we have F = m x 0, F = 0.  Acceleration only applies to a moving object.  Acceleration doesn't apply to a stationary object.  Saying the acceleration is at the maximum is another inversion of the truth.  Saying the Force is at the maximum is another inversion of the truth.

@minnie:  How many times will you allow yourself to be tricked by the same trickster?  Here's my motto, "Trick me once, shame on you.  Trick me twice, shame on me".

Gravock
From AC:
Quote
Quote
When the velocity is zero the acceleration is zero however the force which is the cause of an acceleration is maximum.
F=mA still applies.

allcanadian

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #216 on: August 12, 2015, 11:06:10 PM »
@Gravityblock
You are correct because the correct statement is a Net or unbalanced Force is equal to Mass times Acceleration. So yes obviously the Force acting on the mass is the sole cause as to why the mass moves and when the velocity changes we call this an acceleration. If the mass is not moving then there is no acceleration, thus the statement F=mA is false and Net F=mA is true.
 
AC

gravityblock

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #217 on: August 12, 2015, 11:08:59 PM »
F=mA still applies.

Acceleration only applies to moving objects, thus F=mA only applies to moving objects.  However, if you want to apply F=mA to a stationary object (which is absurd), then fine by me.  It doesn't change what it is, and that is an acceleration of 0, a force of 0, and a velocity of 0.  It is what it is!

Gravock

MarkE

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #218 on: August 12, 2015, 11:10:19 PM »
@Gravityblock
You are correct because the correct statement is a Net or unbalanced Force is equal to Mass times Acceleration. So yes obviously the Force acting on the mass is the sole cause as to why the mass moves and when the velocity changes we call this an acceleration. If the mass is not moving then there is no acceleration... obviously.
 
AC
That is not always true.  Very often it is false.  Please avail yourself to a primer in differential calculus. 

MarkE

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #219 on: August 12, 2015, 11:11:46 PM »
Acceleration only applies to moving objects, thus F=mA only applies to moving objects.  However, if you want to apply F=mA to a stationary object (which is absurd), then fine by me.  It doesn't change what it is, and that is an acceleration of 0, a force of 0, and a velocity of 0.  It is what it is!

Gravock
That is worse than wrong.

gravityblock

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #220 on: August 12, 2015, 11:17:35 PM »
That is worse than wrong.

Well, if you call the inversion of truth right, then I guess that is worse than wrong for you, LOL.

Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness; that put bitter for sweet, and sweet for bitter!

Gravock

MarkE

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #221 on: August 12, 2015, 11:21:54 PM »
Well, if you call the inversion of truth right, then I guess that is worse than wrong for you, LOL.

Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness; that put bitter for sweet, and sweet for bitter!

Gravock
You are free to try and find any authoritative reference that claims as you do that F=mA is conditional on V <> 0.  Or you can pick-up any physics primer and find that no such restriction is imposed.  If you have any doubts about this: you can sit down and either read or solve the equations of motion for a simple pendulum, or mass / spring combination.

gravityblock

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #222 on: August 12, 2015, 11:26:34 PM »
You are free to try and find any authoritative reference that claims as you do that F=mA is conditional on V <> 0.  Or you can pick-up any physics primer and find that no such restriction is imposed.  If you have any doubts about this: you can sit down and either read or solve the equations of motion for a simple pendulum, or mass / spring combination.

Like I said, restrictions or no restrictions.......the acceleration is 0, the force is 0, and the velocity is 0.  Either way, it's 0.  It is, what it is!

Gravock

gravityblock

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #223 on: August 13, 2015, 12:05:52 AM »
@Gravityblock
You are correct because the correct statement is a Net or unbalanced Force is equal to Mass times Acceleration. So yes obviously the Force acting on the mass is the sole cause as to why the mass moves and when the velocity changes we call this an acceleration. If the mass is not moving then there is no acceleration, thus the statement F=mA is false and Net F=mA is true.
 
AC

F=mA is false and Net F=mA is true  <------ That is an elegant way of writing it!  This is so beautiful!  It's like poetry in motion.

Gravock

TinselKoala

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Re: 'Impossible' rocket drive works and could get to Moon in four hours
« Reply #224 on: August 13, 2015, 01:59:59 AM »
Acceleration only applies to moving objects, thus F=mA only applies to moving objects.  However, if you want to apply F=mA to a stationary object (which is absurd), then fine by me.  It doesn't change what it is, and that is an acceleration of 0, a force of 0, and a velocity of 0.  It is what it is!

Gravock
Ah... no.

Gravity is an acceleration, the value of which is 9.8 meters per second per second. You will note that those units are the units of acceleration. A stationary object resting on a scale in a gravitational field, like in your post office, exerts a force downward on the scale, the value of which is F=mA, that is, the downward force on the scale is equal to the mass of the object times the gravitational acceleration in the post office. Everything is stationary, the mass is experiencing a downward acceleration and thus exerts a force (weight) on the scale.

http://physics.ucsd.edu/~tmurphy/phys10/lectures/07_freefall.pdf