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1.2

Minor Versionm

by Vishal Bhatt

Introduction

Using plastic sheets of different sizes to make a parachute, you can show how the area of a surface affects air drag/resistance and how various objects in nature use this principle to their benefit.

Video Overview

    • Handle scissors and cutter with care.

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  1. Cut the bottom of the plastic bag and spread it open.
    • Cut the bottom of the plastic bag and spread it open.

    • Cut between the two layers on both sides so as to get two separate pieces of plastic.

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    • Cut a 20 cm x 20 cm square out of one of the plastic sheets using a ruler and cutter.

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    • Take the 20 cm x 20 cm plastic sheet.

    • Fold AB over CD to make a rectangle.

    • Now, fold QS over PR to make a square.

    • Overlap vertex L with vertex O.

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    • We have a right angled triangle ABC.

    • Fold the side AB towards the hypotenuse AC. Now you get one small and one big triangle.

    • Cut along the line BQ.

    This cutting is not right. Resulting in the jagged edges for the parachute. You have to cut further inside and slightly curved....

    Procheta Mallik - Reply

    For these folding steps, instead of saying top-left, bottom-right etc, may be label the corners 'A' 'B' etc and instruct based on these labels. what ends up being the "top-left" "bottom-right" etc for each kid may be different and so we need to be more specific

    Procheta Mallik - Reply

    • Open the plastic sheet. This makes the canopy of our parachute.

    • You have essentially made a 16-sided polygon, with slightly curved edges, making it look almost like a circle.

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    • As you open the triangle, you'll find the 8 creases (16 `corners'); here we have marked every alternate crease line to identify 8 evenly spaced locations along the edge of the parachute.

    • Place eight cotton threads ( 25cm each) at the edge of the creases.

    • Stick them using a tape.

    The cutting here doesn't look ok, resulting in a jagged parachute. You should cut such that you get as circular a parachute as possible. Pictures hence need to be re-shot.

    Procheta Mallik - Reply

    I'll follow it up.

    Vishal Bhatt - Reply

    • Bring all the cotton threads together, without tangling them.

    • Twist them together at their tip.

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    • Insert the threads into the ring magnet.

    • Make a tight knot.

    • You could use any ring shaped object of appropriate mass, e.g. a nut or any weight, e.g. a stone, which you can tie easily to the strings.

    • Repeat all the previous steps to make a parachute of a different size i.e using a 40cm x 40cm plastic sheet.

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    • Hold the parachute as shown in the figure.

    • Drop the parachutes from a sufficient height (e.g. terrace or balcony of a 1 or 2-storey building) and watch them descend!

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    • The payload is too heavy or too light for the canopy.

    • Strings are unequal in length or not attached properly.

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    • Release both parachutes from the same height at the same time. Record the time taken by each to touch the ground.

    • Double the weight on each parachute and measure the time taken to descend the same height.

    • Measure the surface area (and mass, if possible) of each parachute, and its average velocity in each of the cases.

    • Use 4 suspension lines instead of 8 and then record the time taken by the parachutes to touch the ground. Compare it with your previous observation.

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Finish Line

Vishal Bhatt

Member since: 04/26/2017

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49 Guides authored

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