This Pulley Demonstration System is designed to complement demonstrations of simple machines. From the wheels on a bicycle to the gears in a car, the Pulley demonstration dystem helps explain how things work. Students learn that an increase in the number of pulleys decreases the force required to lift an object but increases the amount of string that must be pulled, yet the amount of work done is independent of the number of pulleys. Attach Newton spring scales to each and quantitatively discover that the force exerted decreases by a factor of 2 for the double pulley as the amount of string that is pulled increases by the same factor. Prove that the number of pulleys is equivalent to this factor. Students learn that the number of pulleys equals the mechanical advantage and that for either pulley the amount of work done is the same.

• Right angled clamps - 3
• Wheel & axle - 1
• Masses Brass. slotted. 2 x 10 g 2 x 20 g 2 x 50 g 4 x 100 g 4 x 200 g 1 x 500 g Total 15 weights
• Weight hangers 5 x 50 g 1 x 20 g 1 x 10 g Total 7 hangers.