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[quote][quote]The vehicles being still or moving wouldn't change anything if there is no atmosphere.[/quote]
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[quote][quote]The vehicles being still or moving wouldn't change anything if there is no atmosphere.[/quote]
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What are you talking about? Do you think the physics demonstrated in the video are due to atmosphere?[/quote]
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What are you talking about? Do you think the physics demonstrated in the video are due to atmosphere?[/quote]
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I think he means that as long as there is no effect of air friction, in physically simulated case, for two vehicles shooting each other, there would be no difference between the situation where both vehicles are stationary and situation where both are moving in same direction and speed.
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I think he means that as long as there is no effect of air friction, in physically simulated case, for two vehicles shooting each other, there would be no difference between the situation where both vehicles are stationary and situation where both are moving in same direction and speed.
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1. In stationaty case:
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1. In stationaty case:
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Vehicle A shoots ball at speed V. Ball hits stationary vehicle B at relative speed V.
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Vehicle A shoots ball at speed V. Ball hits stationary vehicle B at relative speed V.
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2. In moving case.
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2. In moving case.
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Vehicle A escapes from vehicle B, in other words vehicle B is chasing vehicle A.
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Vehicle A escapes from vehicle B, in other words vehicle B is chasing vehicle A.
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Both vehicles move at speed V.
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Both vehicles move at speed V.
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Vehicle A shoots ball at relative speed V. But since vehicle A itself moves at speed V in the other direction, the absolute velocity of ball becomes V-V = 0, [b]as demonstrated in the video.[/b]
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Vehicle A shoots ball at relative speed V. But since vehicle A itself moves at speed V in the other direction, the absolute velocity of ball becomes V-V = 0, [b]as demonstrated in the video.[/b]
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But since vehicle B moves at speed V toward vehicle A, it will hit the ball which is now in its way. The relative speed of the collision will again be V as in previous case.
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But since vehicle B moves at speed V toward vehicle A, it will hit the ball which is now in its way. The relative speed of the collision will again be V as in previous case.
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3. Now lets say the chasing vehicle B shoots ball as escaping vehicle A.
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3. Now lets say the chasing vehicle B shoots ball as escaping vehicle A.
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It shoots ball at speed V relative to itself. Since it shoots in the same direction as it is moving the absolute speed of the ball with be V+V=2V.
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It shoots ball at speed V relative to itself. Since it shoots in the same direction as it is moving the absolute speed of the ball with be V+V=2V.
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The ball will hit the escaping vehicle A at absolute speed 2V, but since vehicle A moves in same direction the relative speed will 2V-V=V, so exactly the same as in previous two cases.
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The ball will hit the escaping vehicle A at absolute speed 2V, but since vehicle A moves in same direction the relative speed will 2V-V=V, so exactly the same as in previous two cases.
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Thus in physically simulated case (but without air friction) there is no difference and no retreat advantage.
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Thus in physically simulated case (but without air friction) there is no difference and no retreat advantage.
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[quote]Can one of you explain to me why you keep mentioning air friction and drag? It's ok to admit you're wrong instead of writing walls of text that try to obfuscate the fact.[/quote]
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[quote]Can one of you explain to me why you keep mentioning air friction and drag? It's ok to admit you're wrong instead of writing walls of text that try to obfuscate the fact.[/quote]
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Because in physically simulated world air friction would provide retreat advantage.
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Because in physically simulated world air friction would provide retreat advantage.
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Lets look again at cases 2 and 3, but with air friction having effect.
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Lets look again at cases 2 and 3, but with air friction having effect.
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In
case
2
the
ball
has
zero
absolute
speed
so
it
won't
be
affected
my
air
drag
and
will
hit
the
chasing
vehicle
with
same
relative
speed
V.
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In
case
2
the
ball
has
zero
absolute
speed
so
it
won't
be
affected
by
air
drag
and
will
hit
the
chasing
vehicle
with
same
relative
speed
V.
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But in case 3 the ball has absolute speed 2V so it is affected by air friction and would lose speed as it moves, eventually hitting vehicle A with absolute speed less than 2V, so with relative speed less than V, doing less damage.
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But in case 3 the ball has absolute speed 2V so it is affected by air friction and would lose speed as it moves, eventually hitting vehicle A with absolute speed less than 2V, so with relative speed less than V, doing less damage.
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Thus with air friction the chasing vehicle can't hit escaping vehicle as hard as escaping vehicle can hit the chasing vehicle.
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Thus with air friction the chasing vehicle can't hit escaping vehicle as hard as escaping vehicle can hit the chasing vehicle.
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Physics simulation vs balance