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# Acceleration

## Acceleration - Physics Forum

### Acceleration - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#1
03-04-2005, 12:33 PM
 Don1 Guest Posts: n/a
Acceleration

There is a constant search for means of attaining maximum acceleration;
which is limited by the power source. In any event the procedure
transpires in the following manor:

When grampa pushes grandson on a sled to get it going fast, so that he
can jump on the back and they can get a nice long slide, despite the
short slope; the energy thus transferred to the sled per second
dwindles slightly with increasing velocity, accompanied by a dwindling
of the force, exerted, and the energy transferred to the sled by
grampa.

When grampa feels that the sled is no longer accelerating or responding
to his maximum effort, he either lets go, or jumps and lands with his
knees on the back of the sled, and whee they _go_.

This limit, or equilibrium, occurs despite the strength of the force
and energy transferred: That's why nothing but light can be accelerated
to, or travel at, the speed of light.

Don

#2
03-04-2005, 05:08 PM
 TripleEight Guest Posts: n/a
Acceleration

"Don1" <[Only registered users see links. ]> wrote in message

Grampa loses the response only because his arm isn't long enough. Another factor
to think about would be that grampa himself must also be accelerating at the
same rate as that of the sled in order for him to be in contact. But this means
that no force will result...hmmm - would be no different to 'pushing' the wall.

Does light 'accelerate'? Anyone?

#3
03-04-2005, 05:52 PM
 Don1 Guest Posts: n/a
Acceleration

TripleEight wrote:
acceleration;
he
the
dwindling
responding
his
force
accelerated
Another factor
at the

No kidding?

But this means
the wall.

Maybe in a cyclotron the size of Texas(;^)

You're quite the BS artiste' there double A; no wonder the teachers got
discouraged with arguing with you and gave you A's. Like the employer
gives his worst employee a good recomendation in hopes he'll be rid of
him(;^)

Are you saying that if grampa had a long enough arm and unlimited
running speed, he could accelerate the sled and grandson forever?

wall? Would the two cancel(;^?

Don

#4
03-04-2005, 06:41 PM
Acceleration

TripleEight wrote:

<snip>

Accelerate *what*? It accelerates electrons, it accelerates plant
growth, it accelerates circadian clocks, it accelerates my morning
shave. But it always move at the same speed - c.

Tom Davidson
Richmond, VA

#5
03-04-2005, 06:53 PM
 TripleEight Guest Posts: n/a
Acceleration

"Don1" <[Only registered users see links. ]> wrote in message

Theoretically yes! The sled would accelerate until the wheel catch fire. But
then you get back to the question of how grampa manage to store all that energy.

you descrbed it you would probably get to a certain speed before you start to
lose contact - your maximum speed which is equal to the sled's.

Now you give the sled to, say, the fastest person in the world, he would manage
a higher speed. We could ignore air resistance and friction for the time being
to understand this concept. What I said about the arm was just a joke.

So my point is, given that there is some kind of person or thing that could
accelerate this sled without any speed limit, the sled will indeed keep going
until the physical factors kicks in to prevent it from going further namely
friction and fluid resistance. There is no acceleration limit (in Newtonian
mechanics) unless you take speed of light (quantum mechanics) into account.

#6
03-04-2005, 06:56 PM
 Don1 Guest Posts: n/a
Acceleration

Don1 wrote:
that
accelerating
'pushing'
got
of
Oh sorry; I've mixed up Triple Eight, with Double A. My appologies to
both of you(:-)

immovable

#7
03-04-2005, 08:56 PM
 TripleEight Guest Posts: n/a
Acceleration

"Don1" <[Only registered users see links. ]> wrote in message

Hehehe...

I'm sure you don't get mixed up with 8^3 and A^2 in physics equations...

#8
03-04-2005, 11:06 PM
 Double-A Guest Posts: n/a
Acceleration

TripleEight wrote:
to
equations...

Sounds like a good poker hand though.

But wait a minute, isn't that the dead man's hand!

Double-A

#9
03-07-2005, 04:24 AM
 ring_theory Guest Posts: n/a
Acceleration

"Don1" <[Only registered users see links. ]> wrote in message
That's why nothing but light can be accelerated

That remains to be seen.
However I think we'll eventually find that light speed is just another
barrier that will be obtained. sound gave us a sonic boom. I imagine a
bright light flash as a result of obtaining the speed of light, however I'm
99% positive that it won't effect time.

ring

#10
03-11-2005, 12:10 PM
 Don1 Guest Posts: n/a
Acceleration

Doesn't light move slower in some mediums?

Don

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