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by Procheta Mallik

Introduction

Make all the classes of levers using the simplest of materials, and identify the load, effort and fulcrum on each

  1. Take a bottle cap and glue it upwards to one end of the ice cream stick .
    • Take a bottle cap and glue it upwards to one end of the ice cream stick .

    • Take one-third of a fat straw and glue the ice cream stick to the middle of the fat straw perpendicularly, as shown.

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  2. Take a small nut and place it inside the bottle cap. This is the "load"
    • Take a small nut and place it inside the bottle cap. This is the "load"

    • By applying force on the empty end of the ice cream stick, the load gets ejected from the bottle cap.

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    • Mark 2 cm from one end of one of the ice cream sticks

    • Take the other ice cream stick and wind it to the first stick with a rubber band where marked

    • Shear the two loose ends of the ice cream sticks a bit apart.

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    • Now wind another rubber band perpendicular to the other rubber band and between the sticks as shown in the figure.

    • Keep the thermocol bead in between the two ice cream sticks.

    • This now demonstrates the working of a nut cracker, a Class 2 lever.

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    • Mark 2 cm from one end of both the ice cream sticks.

    • Then wind a small rubber band along the marked end of each ice cream stick.

    • Now wind both the ice cream sticks together using a small rubber band along the marked ends.

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    • By placing your fingers on the rubber end, you can demonstrate the working of a tong .

    • You may pick up light objects by pressing the tong slightly away from the rubber band, towards the centre of the ice cream sticks.

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    • Ice cream sticks should not be wet or bent.

    • Make sure the rubber bands are tightly wound around the ice cream sticks.

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    • Can you give real world examples where these lever types are used? List various simple machines and try and identify in which Type they will fit!

    • Identify the fulcrum, load and effort on each of the Types of Levers

    • In the Type 3 Lever: Tongs , if you move the rubber band to the middle will the fulcrum position change?

    • In the Type 2 Lever: Nutcracker, if you move the rubber band to the middle will the fulcrum position change?.

    • In the Type 1 Lever: Catapult , if you move the fat straw to the other end of the ice cream stick will the fulcrum position change?

    • Which lever necessarily has a mechanical advantage greater than 1, and which less than 1? Is there a Class of levers whose mechanical advantage can theoretically be any positive number?

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Finish Line

Suhail Ahanger

Member since: 05/02/2017

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55 Guides authored

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