1M20.10 Pulleys

An assortment of large pulleys can be rigged several ways.

 

Sets of large pulleys rest on a table with ropes, string, and a spring scale. A hooked mass hangs from a pulley system.

A large mass is hooked to the bottom of a 100-N spring scale. The top of the spring scale is hooked to a rope, which passes up over a pulley and down at an angle to the top of a second 100-N spring scale. The bottom of the second spring scale is hooked to a fixed rod. The system is under tension. The first spring scale reads about 55 N. The second reads about 50 N.

Single pulley, No mechanical advantage, just a direction change

The same large mass as seen in the previous photo is once again hooked to a 100-N spring scale. In this case, however, a set of pulleys are used to create a 5 to 1 mechanical advantage pulley system. The far end of the rope once again is fastened to a second spring scale, fixed at an angle. The first spring scale reads about 55 N. The second spring scale reads about 14 N.
5 to 1 mechanical advantage pulley system

5:1 mechanical advantage, 400g will support 2kg

This photo depicts a variation on the maritime pulley system known as "Spanish Burton". This 8:1 advantage variation uses four pulleys: a string of three large hooked masses hang from a pulley, which itself is fastened to a second pulley, whose rope runs over two more pulleys and down to a single, small hooked mass.
Spanish Burton Pulley System

Spanish Burton Pulley System 8:1 advantage, to support 4kg  500g needed

Use meter stick to measure distance moved &show that work in ≅ work out

Location: C4-4