Function of Counterweight


by primarygun
Tags: counterweight, function
primarygun
primarygun is offline
#1
Dec7-04, 02:51 AM
P: 234
What are the functions of counterweight in a lift system?
Phys.Org News Partner Physics news on Phys.org
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Mapping the road to quantum gravity
Chameleon crystals could enable active camouflage (w/ video)
Tide
Tide is offline
#2
Dec7-04, 03:10 AM
Sci Advisor
HW Helper
P: 3,149
Use of a counterweight avoids having to lift so much weight! Less weight means less power consumed and lower cost.
rayjohn01
rayjohn01 is offline
#3
Dec7-04, 02:55 PM
P: 284
In theory ( ideal ) a counterweight means that a system has NO net forces due to gravity and is balanced with no tendancy to move even tho' free to do so.
This means a separate force applied does not have to do gravitational work ( lifting ) but only against friction . So for example if I suspend two 1 ton weights over a rope and pulley , which are balanced, then to move them does not require me to lift 1 or 2 tons . They still have inertia ( and resist moving ) but not due to weight , and if there is little friction then any applied force would move them but slowly if the force applied was small.
in many cases a counter weight is used to reduce stresses in the frame -- a large crane is an example , where the horizontal arm with a lot of weight would twist the upright unless a counter or balancing weight is used. This changes the direction of stress to one of compression down the upright rather than bending it. Steel is very strong in compression but weak in bending.
Ray

primarygun
primarygun is offline
#4
Dec8-04, 02:43 AM
P: 234

Function of Counterweight


So when the counterweight moves down, force applied by human is reduced.
When it moves up, force required to make the lift down is bigger, but it makes use of gravitational force.
Here, should I use energy instead of force?


Register to reply

Related Discussions
Need help with Impulse function and unit step function at singularity Differential Equations 6
Give to an interpolation function an analitic function with mathematica Math & Science Software 1
[SOLVED] Dirac delta function and Heaviside step function Advanced Physics Homework 2
[SOLVED] fourier transform of a function such that it gives a delta function. Calculus & Beyond Homework 1
Going from the hazard function to the density function and to the cumulative distribu Precalculus Mathematics Homework 2