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# rotation. why easier when greater r?

## rotation. why easier when greater r? - Physics Forum

### rotation. why easier when greater r? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#1
10-30-2005, 08:49 AM
 mumi Guest Posts: n/a
rotation. why easier when greater r?

throwing a ball on the object
why is it 'easier' to rotate the object
when acting on the point farther away
from the point of rotation
(with greater r) ?
i know it is connected with angular momentum and so on
but why is it so?
it seems to me that it must be because of the way
force/acceleration/momentum/whatever the best
is 'distributed' between the
points/particles/atoms/??
of the object but i cant
think of any good way to touch this subject.
could anyone help?

#2
10-30-2005, 10:02 AM
 mumi Guest Posts: n/a
rotation. why easier when greater r?

and what would that reason be?

#3
10-30-2005, 11:00 AM
 Steve Ralph Guest Posts: n/a
rotation. why easier when greater r?

"mumi" <[Only registered users see links. ]> wrote in message
news:dk29ao\$8it\$[Only registered users see links. ].tpi.pl...

The Principle of Moments (which has nothing to do with clocks)

[Only registered users see links. ]

sr

#4
10-30-2005, 11:41 AM
 mumi Guest Posts: n/a
rotation. why easier when greater r?

[Only registered users see links. ]

this lecture states the same in a different way but gives no reason.
you cant use A to prove A
this lecture assumes that you will mulitply by r but gives no reason why
sure the numbers are correct but that's hardly a reason.
as far as i can see to give a reson one would have
to describe forces (or whatever good word) acting
on and within the bolt.

#5
10-30-2005, 11:47 AM
 mumi Guest Posts: n/a
rotation. why easier when greater r?

and the wrench. even more important

#6
10-30-2005, 12:54 PM
 mumi Guest Posts: n/a
rotation. why easier when greater r?

you just said the same in a more mathematical way.

it's not a reason of any kind.

to give the reason you would have to arrive at

t = I*a

starting from

F = m*a

(and or course you cant use other angular

equations like L = r x p untill you get it from

linear one)

Finding out that you get a correct result by

multiplying force by some vector which

in some magical way happens to be equal to r

is not the explanation i am looking for.

#7
10-30-2005, 01:10 PM
 mumi Guest Posts: n/a
rotation. why easier when greater r?

ah and of course you cant use any other conservation
laws. only linear momentum.
everything else would be finding some magical equation
that somehow fits.

#8
10-30-2005, 04:12 PM
 mumi Guest Posts: n/a
rotation. why easier when greater r?

why? why is torque for a fixed force direct proportional to the distance
from the fulcrum?
it is still magic to me.

#9
10-30-2005, 06:14 PM
 Matalog Guest Posts: n/a
rotation. why easier when greater r?

"John Christiansen" <[Only registered users see links. ]> wrote in message
news:4365136b\$0\$4820\$[Only registered users see links. ].telia.net. ..
the

A good question.

#10
10-30-2005, 06:39 PM
 mumi Guest Posts: n/a
rotation. why easier when greater r?

> Torque is by definition the product of the of the force and the distance

i am really speechelss here.
are you trying to help me or annoy me?
cause you are doing the other.

 Tags easier , greater , rotation

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