Register to reply

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

by zizodev
Tags: force, lift, pulley, requires, weight
Share this thread:
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 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
Apple to unveil 'iWatch' on September 9
NASA deep-space rocket, SLS, to launch in 2018
Study examines 13,000-year-old nanodiamonds from multiple locations across three continents
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)
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