"Marvel" <No SPAM@[EMAIL PROTECTED]
> wrote in message
news:26d33$479fdf1f$452820ea$4363@[EMAIL PROTECTED]
> Could someone kindly point me (no math skills) in the direction of
> figuring mechanical advantage.
>=20
> for example if you have a block on the floor and you attach a pulley
> to the ceiling, thread the rope from the block thru the pulley to
> you, then stand there and tug on a rope to lift the block.
>=20
> ima=3Deffort/resistance
>=20
> Thanks in advance
You can generally work it out as the ratio of the
distance that the pulled end of the rope travels
over the distance that the block moves.
In the case you give, the block moves the same
distance as the pulled end of the rope, so the
the mechanical advantage is unity (no advantage).
Another way to find the mechanical advantage for
ropes and pulleys is to count the number of=20
sections of rope that sup****t the block. If,
for example, the pulley was attached to the block
rather than the ceiling and one end of the rope
was fixed to the ceiling, passing down through the=20
block and then back up and you pulled upwards on
the free end, then there would be two lengths of
rope sup****ting the block. Mechanical advantage
2 to 1.
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