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1.2

Minor Versionm

by Procheta Mallik

Introduction

By linking several ice cream sticks using thin binding wire we can create a lifting jack and explore the principles and properties of simple machines and calculate their mechanical advantage.

Video Overview

    • Handle scissors/cutter with care

    • Beware of the pokey ends of the binding wire

    • Use the needle/allpin very carefully

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  1. Using a ruler, mark dots at 2cm from each end of an ice cream stick as well as at the centre.
    • Using a ruler, mark dots at 2cm from each end of an ice cream stick as well as at the centre.

    • Make three holes in the stick with a needle/allpin at the marked spots.

    • Repeat the above steps for 11 more ice cream sticks

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    • Join two of these sticks using about 1-2 cm of thin binding wire through the centre holes.

    • Using scissors - or your fingers - bend the thin binding wire ends into loops, so that they act as stoppers .

    • Repeat the above steps for the remaining 10 "holed" ice cream sticks; you now have 6 "X" shaped "lazy tongs".

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    • Connect 2 lazy tongs using binding wire pieces through the end holes, as shown.

    • Loop the ends of the binding wire pieces, as before, to secure the joints

    • You should end up with 2 lazy tongs now fully connected!

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    • Add another tong to the pair of tongs, in the same fashion, so that you now have a link of 3 lazy tongs

    • Repeat the previous steps for another set of 3 linked lazy tongs, so that you now have a pair of triple-linked lazy tongs

    • The lazy tongs can stretch and shrink.

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    • Mark spots 2cm from each end of one of the remaining 4 ice cream sticks.

    • Using a needle/allpin, make holes at the marked spots.

    • Using a cutter, make one "V" shaped notch at each end of the ice cream stick, above the marked spots.

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    • Using a cutter, make slightly deeper "V" shaped notches/grooves on the ends of the last ice cream sticks at each end of the pair of the triple links.

    • This means, you would end up with 4 deep grooves at each end of the triple-links

    • Join the ice cream with "V" notches to the notches made on the lazy tongs, using glue.

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    • Now wind thin binding wire through the holes made in both the ice cream sticks, to the end holes of the triple-link assembly.

    • Repeat the above steps for the other end of the lazy tongs .

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    • Two more ice cream sticks have to be attached in exactly the same way at the other end of the triple-links

    • Repeat Steps 5-7 to achieve this

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    • Ensure you glue the joints at the end of the links

    • This makes your links sturdy

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    • By holding one of the attached ends, you can shrink and expand the links and have the "lifting jack" expand and contract

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    • The loops made on the ice cream sticks should not be loose .

    • Do not apply pressure on the ice cream sticks while making hole using needle/allpin, as the ice cream sticks start cracking/splinting horizontally.

    • Ensure the holes are made at exactly the centre of the sticks, else the lazy tongs won't work properly.

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    • What is the maximum horizontal distance by which you can shrink or expand the jack?

    • What is the maximum vertical displacement achieved by shrinking and expanding the jack?

    • Where else do you observe this sort of jack, or any other, in your daily life?

    • Identify the load, effort and fulcrum of each link.

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Finish Line

Suhail Ahanger

Member since: 05/02/2017

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54 Guides authored

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