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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

  1. 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
    • 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

  2. 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".
    • 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".

  3. 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!
    • 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!

  4. 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.
    • 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.

  5. 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.
    • 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.

  6. 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.
    • 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.

  7. 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 .
    • 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 .

  8. 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 Repeat Steps 5-7 to achieve this
    • 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

  9. Ensure you glue the joints at the end of the links This makes your links sturdy This makes your links sturdy
    • Ensure you glue the joints at the end of the links

    • This makes your links sturdy

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

    • 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.

    • 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.

Finish Line

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