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by Procheta Mallik


Cut a plastic bottle and use the bottom part of the bottle and the bottle cap. Insert given wooden skewer through the bottom part of the bottle. Put the bottle cap through the skewer. Now make another hole in the bottle and insert half a stick or refill such that the stick touches the bottle cap. Rotate the bottle. The stick would rub against the threads of the bottle cap and make a creaky sound.

    • Use candle/fire under adult supervision

    • Be mindful of the pokey ends of the skewers and hot metal wire

    • Use scissors/cutter with care

  1. Take 2 bottle caps of different sizes and glue the two ends of the caps using glue as shown .
    • Take 2 bottle caps of different sizes and glue the two ends of the caps using glue as shown .

    • Take a thin wire of ~10 cm and heat the wire using a candle to make holes in the middle of both the caps .

    • The holes in the caps should be such that the skewer fits very tightly in them. If not, then glue will need to be used later and that may cause further issues.

    • Cut the top one-third off a plastic bottle using scissors/cutter

    • We need only the bottom two-third of the bottle

    • Make three holes on the bottle as shown:

      • Two diametrically opposite each other, about 2cm from the top

      • And a third hole halfway between the other two, but a further cm lower

    • Insert the skewer through the diametrically opposite holes, while also going through the centre-holes in the caps

    • Now attach beads at either end of the skewer; these act like stoppers

    • Insert an empty ball pen refill (or half a skewer) from the middle hole such that the sharp tip just touches the grooves of the bigger bottle cap.

    • Hold the long end of the skewer and spin the bottle around.

    • The caps should be stationary while the refill/skewer rotate and scrape along the rough surface of the cap, making a loud noise that is amplified by the bottle .

    • Also try by keeping the refill/skewer against the smaller cap and see if there's a difference in the quality of sound.

    • Make sure that the main skewer sits very tightly with the bottle caps, but loosely against the bottle itself

    • The poking skewer/refill should fit very firmly through the bottle

    • You may need to use glue to secure the caps to the skewer and/or to secure the refill/skewer to the bottle

    • Can you identify which part of the roaring bottle acts as the wheel and which the axle?

    • How can we change the pitch of roaring?

    • Can you give examples of where wheels and axles are used?

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