By: Olivia Tanner and Kimberly Anderson
What is a pulley?
A wheel with a grooved rim around which a cord passes. It acts to change the direction of a force applied to the cord and is chiefly used (typically in combination) to raise heavy weights.
A wheel, with a grooved rim for carrying a line, that turns in a frame or block and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end.
Real Life Examples
MA = output force/input force
I have a block and tackle system. I pull down with 200 pounds of force and can lift up to 1,200 pounds with it. What is my mechanical advantage?
MA= 1,200/200MA= 6