Why would one want to use a pulley that had a small mechanical advantage?
2007-01-21 14:06:42 · 6 answers · asked by shelbysurfer 1 in Science & Mathematics ➔ Physics
To make it easy to lift something. A pulley with a small advantage will allow you to lift a large load by pulling at a reduced effort for a longer time.
2007-01-21 14:11:05 · answer #1 · answered by Grizzly B 3 · 0⤊ 0⤋
length of the pulleys won't rely in a frictionless equipment yet friction can lose some or all your mechanical benefit in a actual equipment. for occasion, in case you have a single "frictionless" overhead pulley (any length) once you pull down with one hundred# rigidity, you may raise precisely one hundred#. yet while the pulley bearings are defective or rusted, you may ought to pull down with say a hundred and fifty# rigidity to enhance one hundred#. The diameter of the pulley has its very own mechanical benefit in overcoming pulley bearing friction corresponding to a brilliant handwheel being greater helpful ably to coach a confusing valve. If the pulley diameter is in simple terms too small the rope could slip particularly than turn the pulley and if the pulley groove isn't sized suitable the rope won't strengthen its finished grip.
2016-12-12 17:10:57 · answer #2 · answered by zagel 4 · 0⤊ 0⤋
Pulleys do not have mechanical advantage.
Block and tackles, made up of pulleys, do.
2007-01-21 14:38:19 · answer #3 · answered by J C 5 · 0⤊ 0⤋
You could lift more weight than you could lift without the pulley.
2007-01-21 14:10:54 · answer #4 · answered by ecolink 7 · 0⤊ 0⤋
not only can you lift more weight, but you can lift larger objects, that may not be too heavy for you to lift, but too large for you to lift.
50lbs is not much to lift. but make that a 50 lb metal box frame that is 10 feet on a side with no hand holds, and the pully is a great help.
plus with the pully you can operate in your "line of power"
which is a MOVE SMART tm. technique that tells us that when lifting to keep as many joints as straight as possible, and to keep your heavy lifting within a certain distance (24 inches) of your body. this way all of your muscle is going into lifting the object, and none of it is going against the lift while trying to mantain an extended limb.
2007-01-21 14:20:08 · answer #5 · answered by Anonymous · 0⤊ 0⤋
pulleys allow you to lift more than otherwise possible you just need to work for a bit longer.
2007-01-21 14:12:43 · answer #6 · answered by ui6fu6yujt c 2 · 0⤊ 0⤋