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by Suhail Ahanger

Introduction

Make a beam balance using cycle spokes, some thread and a couple of plastic bottles

Video Overview

    • Handle the cutter/scissors with care

    • If using the candle, light it with care and have an adult around

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  1. You need two plastic bottles of the same size
    • You need two plastic bottles of the same size

    • Take a plastic bottle.

    • Cut the bottle in half using a paper cutter/scissor.

    • Repeat the above step for the other bottle.

    • Only the bottom parts of the bottle are needed for this TACtivity

    • The top part of the two bottles can be used later for "Balloon bugle " or " Cap Tiktiki" Tactivities.

    Vishal, 26/06:

    (1) "Take 2 400ml " - write it as "Take two".

    (2) It can be any waste plastic bottle, not just 400 ml or soft drink bottle.

    Procheta Mallik - Reply

    • Using the hole-puncher, make a hole 2cm from the top of the cut bottles.

    • You may also make the hole using a heated metal wire/spoke, which you can heat on a candle flame

    • You need to make 3 such evenly spaced holes along the top rim, so use your judgement to keep them separated by about 120 degrees

    Vishal, 26/06:

    (1) It is not clear where to make the holes. I am assuming they need to be equidistant. Probably one can use a thread to find the circumference, mark the thread to divide in 3 equal parts.....

    (2) Instead of saying discard the top part, we can say "keep it safe for future tactivities". Top part can be used to make "balloon bugle" + "cap tiktiki"

    Procheta Mallik - Reply

    Vishal, 26/06:

    (3) Also, make use of markers with appropriate colors to highlight and make the step clearer.

    Procheta Mallik - Reply

    • Take 3 threads of equal length (~25cm), and secure them with knots in each of the holes in the bottle

    • Repeat the above for the other bottle

    • The two bottles will now act as weight holders

    • Tie all the three threads together with a knot at the loose ends

    Vishal, 26/06:

    (1) The first 4 substeps can be combined into 1, something like "Take 3 threads of equal length, insert one in each of the holes of a bottle and join them at the top."

    Let us minimize the text otherwise people may skip reading the whole step.

    Procheta Mallik - Reply

    • Join the two spokes by screwing the spoke nut halfway into the threaded end of each spoke

    • Tie a thread to the centre of this spoke assembly

    • Use insulation tape near the thread to secure it firmly at the desired position.

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    • Place the bottles at the extreme ends of the "beam" and use insulation tape to secure them.

    • Try to balance the two empty bottles.

    • If the beam is not balanced with empty bottles as seen in the picture, use layers of insulation tape at the extreme ends of the spoke as counter weights to balance the beam.

    • A balanced beam gives results with better accuracy.

    Vishal, 26/06:

    Again, too much text. The step can just say "You are given few nuts. Play with your beam balance by placing different number of nuts on the two sides of the balance."

    Procheta Mallik - Reply

    Vishal, 26/06:

    Probably there can be more photos with different number of nuts on the two sides.

    Procheta Mallik - Reply

    • The balanced beam can be seen in this picture.

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    • Using the nuts given, play with your beam balance by trying various number combinations of nuts on either side

    • Weigh a nut using a scale and use the nuts to now calibrate weights of other objects

    • E.g., place a stone on one side of the balance and nuts on the other side. Measure the mass of the stone and record it here. Verify the mass by weighing it on a scale.

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    • Make sure all three holes are at the same level of 2 cm from the cut end

    • The threads tied should be of the same length.

    • Make sure the bottles are hung at equal distances from the centre of the spoke beam.

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    • When the thread is moved towards the holder end/balance point, will the balance get altered?

    • Weigh given balloon on a weighing scale, without inflating it, and record your reading here.

    • Now inflate the balloon and place it on one side of the balance. Balance it out by placing weight on the other side. Guess the mass of inflated balloon and record it here.

    • Now measure the mass of the inflated balloon on the weighing scale and record it here.

    • Is there any difference in measuring the mass of the inflated balloon with our beam balance and the weighing scale?

    Vishal, 26/06:

    1) Second observation is interesting and actionable, first is not.

    2) The tactivity expects children to place different weights in the balance and verify. Probably few observations could be:

    * Place a stone one one side of the balance and nuts on the other side. Guess the mass of the stone based on this and record here.

    Verify the mass by weighing it on a scale.

    * Weigh given balloon on a weighing scale, without inflating it and record your reading here.

    * Now inflate the balloon and place on one side of the balance. Balance it out by placing weight on the other side. Guess the mass of inflated balloon and record here.

    * Now measure the mass of inflated balloon on weighing scale and record here.

    Procheta Mallik - Reply

Finish Line

Suhail Ahanger

Member since: 05/02/2017

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54 Guides authored

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