Re: A few silly questions


"Wayne Dobson" <nospam@xxxxxxxxxxxxx> wrote in message news:KGOyh.8336$9S5.3440@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hello folks,

I'm engaging in discussion with someone and have found myself going around
in circles, so I'd appreciate some help with a few mundane questions:

Can velocity change without time?

No.

Can acceleration take place without time?

No.

Is there such a thing as instant acceleration?

Err... instantaneous velocity and instantaneous acceleration
are meaningful terms, the simplest example being the speedometer of a car.
30 mph does not mean you have to travel 30 miles for a whole hour.
30 mph does not mean you have to travel 44 feet for a whole second.
30 mph does not mean you have to travel 0.44 feet for a whole 1/100th second.

You can make the time interval as small as you like as long as it is not zero.
Division-by-zero is undefined.


Can momentum change without time?

No, momentum is velocity multiplied by mass.


Can anything change without time?

No.

Is this statement true: "But when no distance is covered against or with the
force, no work is done
and energy is neither stored nor expended."?

Yes. Work is done when the movement takes place.
Work and energy are equivalent, they have the same units.
Lift a brick from the floor and place it on the shelf. You
have done work upon it. The brick then has the potential
energy to fall off the shelf, gathering kinetic energy as it falls
and losing potential energy, does work on your toe and
breaks it. Of course that is simplistic, a flywheel can store
energy and not go anywhere.


Thanks for your time.

--
AKA "Dobbie The House Elf"

You are welcome, Dobbie. Beware of muggles.
Sorcerer Androcles Dumbledore, Headmaster, hogwarts.physics.


.

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