which pulley system requires the least force to lift the same weight?

by zizodev
Tags: force, lift, pulley, requires, weight
zizodev is offline
Mar16-12, 04:38 AM
P: 22
1. The problem statement, all variables and given/known data

2. Relevant equations

Force applied on the weight=F*(MA).

3. The attempt at a solution
i chosse the E system ...it has the greater mechanical advantage (MA)=3.
MA(of A)=1, MA(of B)=2,MA(C)=2,MA(D)=2,MA(E)=3..
I hope my suggestions are correct !!! :)
Phys.Org News Partner Science news on Phys.org
Cougars' diverse diet helped them survive the Pleistocene mass extinction
Cyber risks can cause disruption on scale of 2008 crisis, study says
Mantis shrimp stronger than airplanes
technician is offline
Mar16-12, 01:39 PM
P: 1,506
I agree with you. The 'trick' in these question is to ignore the pulley connected to the ceiling, this pulley simply changes the direction of the rope.
Count the number of strings holding up the weight, in E it is 3..... Therefore this needs the smallest tension in the string (1/3 the weight)
OldEngr63 is offline
Mar16-12, 04:48 PM
P: 343
What do you think F = m a hass to do with this problem?

Register to reply

Related Discussions
Finding tension and acceleration in a 3 weight, 3 pulley system Introductory Physics Homework 3
Max weight that anyone can lift using over head pulley. Classical Physics 5
Weight of man in a lift when lift is ascending/descending. Introductory Physics Homework 4
force required to lift weight General Physics 4
Pulley system with a weight's acceleration of g/5 Introductory Physics Homework 6