What are the effects of the mass of the pulley and string in Fletcher's trolley

[mballaz]

Homework Statement

Homework Equations

What happens if you take into consideration the mass of the pulley, the mass of the string, and the force of friction between the string and the pulley when you are doing a Fletcher's trolley question?

The Attempt at a Solution

i know that by taking into account the mass of the pulley, the time elapsed increases, according to the simulation at http://canu.ucalgary.ca/map/content/energy/energy_cons/simulate/fletcher/applet.html
This simulation also states that by taking into consideration the mass of the pulley, the forces of tension acting on the objects become imbalanced; the hanging object has a higher force of tension. but what i need to know is WHY? how does the mass of the pulley affect this? and how does the mass of the string and the friction between the pulley and the string affect the experiment?

 

[PhanthomJay]

The string tension has to overcome the rotational inertia of the pulley , friction, and its own weight, in addition to the inertial masses. That means more force and work is required to accelerate them all at a lower rate, while overcoming friction as well.