How it provides mechanical advantage
in an elevator, cables are attached to the car and are run through a pulley at the top of the shaft. The other end of the cables are attached to a heavy steel weight called counterweight. When the car goes up, the counterweight goes down and viseversa
Lifting a flag
on top of a flag pole there is a pulley that works by lifting the flag up when you pull down on the other side of the rope
Mechanical advantage = Out Put Force / In Put Force
1) Laura wants to lift up the 150N mainsail of a sailing boat. To do this, she uses a pulley to connect one end of the rope connecting with the mainsail to the other end of the rope and pulls down on it to lift the mainsail. If Laura weights 250N, what is the mechanical advantage of using a pulley to lift up the mainsail?