The discussion revolves around a pulley system problem involving two pulleys with weights and a load being lifted. Participants are tasked with calculating the total work done, the force required, and the efficiency of the system.
The discussion is active, with participants engaging in identifying and naming the tensions in the system. Some have begun to formulate equations based on their understanding of the forces at play, while others are checking assumptions about the pulleys being frictionless.
Participants are working under the assumption that the pulleys are frictionless, which influences their calculations and reasoning about the tensions in the system.
thereddevils said:
…tiny-tim said:hi thereddevils!
not even close
in questions like this, always mark all the forces on the diagram first
in this case, there are four tensions (one of which is F) …
what are they?
tiny-tim said:Give the tensions names (T1 T2 T3 and F), and write the equations for each pulley, starting with the lower one …
what do you get?
tiny-tim said:Perfect!
ok, now (i'm assuming the pulleys are "frictionless") the tension in the rope on either side of a pulley is the same,
so T1 = T2, and T3 = F, and so … ?
