Question

describe the construction of a simple pulley​

Answer 1

A Pulley is a simple machine having a wheel on the fixed axle, with the groove along edges for guiding a cable.

• Pulleys are nothing but teethless gears. instead of running directly together, some kinds of cords, ropes, cables and belting are made to drive each other.
• A simple pulley consists of two parts: a spinning pulley wheel, and a rope running around it.  A groove around the top of a pulley avoids the moving of the cord from side to side. The groove helps hold the rope as well. Pulleys are levers that have been modified.
• Belts are looped over pulleys and there may be a twist between the pulleys and they need not be parallel to the shafts. The belt can move the pulleys normally in one direction. in two pulley systems, or the belt can be crossed in order to reverse the direction of the driven shaft.

Answer 2

The construction of a simple pulley:

• Simple pulleys are machine used in pulling heavy objects or lifting it and it can be constructed with objects of our house.
• There are some simple steps to construct a simple pulley. Placing 2 cardboard blocks opposite each other on a surface that is raised.
• A pencil should be slide through the spool for creating an axle. Two holes are created in the boxes at a distance of 3 inches. Putting two pencils with spool through the two holes to make it perpendicular to the box side.
• A string twice as the height of the box should be cut and tied around the pencil. A paperclip should be slide through the string so that it can be in the middle of both pencils. A small load should be hanged on the clip. The pulling of the string will lift the load.

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