The pulley is balanced when the force we apply F equals the load R.
F = R
It allows us to lift and lower loads easily and is used in wells, simple cranes and gym equipment.
With this system, we only need have the force to lift the same weight as with a fixed pulley.
This is a special combination of fixed and movable pulleys.
The more pulleys we have, the more complex the mechanism, but the easier it is to lift the load.
Look at these two compound pulley systems (n is the number of movable pulleys):
Movable and compound pulleys can be used for lifts and cranes
Watch the Youtube video and answer the following questions in the first 3 minutes of the video. Do it in your notebook.
1.- Write the four simple machines that appear in the first minute.
2.- Complete the following sentences:
“These are simple machines, the basic ___________ blocks of mechanical ______________”
“All simple machines make _____________ _____________”
“Work = ___________ x distance”
________ Work = _________ Work