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Pulley Demonstration Activity Set

Product Cat # PH0280

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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. Consists of a rectangular wooden base 81 x 20 cm with two sockets on its top in which metal rods of diameter 12.5 mm and length 81 cm can be screwed in vertically. At the top of the vertical rods, two right angled clamps support a horizontal rod of the same size. Eight collars with hook are provided and can be inserted on the horizontal rod for suspending various pulleys. A capstan is fitted on the wooden base atone end , with a hook for attaching a pulley at the other end of the base.

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. Consists of a rectangular wooden base 81 x 20 cm with two sockets on its top in which metal rods of diameter 12.5 mm and length 81 cm can be screwed in vertically. At the top of the vertical rods, two right angled clamps support a horizontal rod of the same size. Eight collars with hook are provided and can be inserted on the horizontal rod for suspending various pulleys. A capstan is fitted on the wooden base atone end , with a hook for attaching a pulley at the other end of the base.

Set-up includes

Wooden base 81 x 20 cm fitted with 2 sockets, a capstan and an eye hook.

Rods 3 (diameter 12.5 mm and length 81 cm)

Collars with hook – 8

8 Pulleys single, 2 Triple tandem, 2 Quadruple

Right angled clamps - 3

Cord - 4 roll

Wheel & axle - 1

 Tommy bar for tightening vertical rods - 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.


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