Table Of Content

inking Scienc ‘activities to sharpen your Is. ‘science and maths PHINSINGSCIENCE Arsiad Gupta bos wiran a dozen Daoles un iene, UUanduedoverv'ghty hooks in lind ael presented ninety sittmsunscmcvarticics, Hisfsrhonk Acinioh ose audit Sane Ear beeatramlard narrate Indie langgazes. TTshas revel cevera tumours, neha, she inaugural maine” Award lurSienee Populaciarion ‘axcomgt Chiklon {1988.81 pees be:sworkingin Pons, admlereraniverdneCengnon Asem’ Ame hye (Chibien'sScdenc: Caner. Tis isissexor bask pabliched by Schutt the Set, Cae aod Zh 20271, ea heak an ssleave aude acre THINKING SCIENCE Agnes “0 SHARPEN YOUR AIMS AND SCIENCE SKILLS Arvind Gupta Mustrated by Avinash Deshpande CONTENTS CGeomat'y hy Pape Foking PaperDiamands Knot Pestagor Hexen Fading an Octagon Argies ota Thangs SetFlecking Palla ogeam BetHlecking Guba Postcard Stuclures Eggs! Teno ‘Geedasie ema Puan lean the Dur aso Tian Mlexagons Hore about Flmxagons isin PaporFlexagan Bow Ont Siler: Motion Film Wire Puceles up anu Bulb Misroscupas, Fay Made oust raonstck Tae erane Wing Spring Bzrale Balance Pras Buter: Switch Ghroestagrapiy Woo Nameplates Tergrin BaxPVASTIEATRRSARAIRN INTRODUCTION For many unfortunate students today textbooks ave become synonpnus wit knowledge. What isttagic s thal children loge sight of the fact shat thova is a vast excting werd outscl and may developa dstasto oflearning, (Children are alert exploters. in thet fraa moments lhey are always experimenting snd improvising, -nacnng and inventing things out of odds and ends, ‘They learn a great deat from ordinary things found ‘araynd tha house, Thernain thing about screpis that children car use it freely without adult adhmanishme. This book lists a few inrovative experiments for loaring science and which make the actof aequifng nowouge fun and spontaneous. Geometry by Paper Folding Paper folding is mathematical by 2s very nature. A sheet of paper starts us @ plane. Atold produces a straight ling ~an intersect.on of we planes. You wl need Asheet of paper Here we go 1. Assimple right angle or #0 degrecs is there in all paper shows as every sheat has rgft-angle corners. Aiea ot meso Ganionia Exeriaes in Peg Potaing rat braun inte ym book 2f the sane ema. wine iy Iva eremancian in 1208 118 fame 9s: Sunsara Re 2 rsomyaseverasuipenet congen by doubing upon itse.ane soning bwoexact ight angles oneither side ofthe case, 9. AdS-denres angles got by folding any ightangle ‘orner irto halt 4. Fora80-degree angle. divide a straight edge 180 degrees nto three equal angles, Take a point mica ox the straght edge of the paper. Litt oth ‘edges ofthe paper from thie point anc fold ther toappreximatery 20 degraes. Bolore creasing. ensure thatthe edges ars flush vith the folds to be creased forming accurate 60- dogras angles, Paper Diamonds Los camy an folding —‘rom axparimenting wth angles ‘We car: move or to gee a sevios cfnesing aamonds You wil aed Asheetot papar Here we 90 1. A30-degree angle can be got twoways, Either {YoU could fold arignt angle na thras equal parts, ‘or else, told the 60-dagrae angle suc’ that one edge doubles on he attr. 2. A TS-degres angle ear ne got by halving the 30- degree angle. Th’s canbe simply aones by dausling cone edge exer heathe’ You ao nct need lo use the profraccor, the pompass ‘or any othar aid from the geomety bex lor folding these angies. By combining the ang os, you van get several more. Forinstance, 105 dlagrees canbe got byadding 80 and 16. Angle of 75 degrees can be got by subtracting 15 frm: 9¢. 3. Want fold alarrond? Fold sheet “alinto two ardthen into tous 5. On opening the sheet, youll see an elegant ‘romus in tha middle, ie LI 6, lfyoumate several paral reas inte four fod arnt then on opening up ya Wi ee diamond in a diamondin a ciamnarc-—a series of nesting diamonds, Knotty Pentagon Foloinga paper into five equal parts can prove tricky, especially 4 regular paiygon with an odd number of sides. You wil need A shoot ol paper Herewe go 1. How de youtold a regular pentagan? We often te nots in pyjama s'ringsand ropes, saldom noticing that a tight knot takes the snepe af a pentagon ‘Take a long rectangular stip of paper andtiethe ‘vo loose ends into an ordinary kat, 2 Gently p.illthe end to tighten the knot and youl be surprisedta sae a vary neal kroty pentagon, e Hex Cob ‘Now tryolding a reguiar hexegon. You will aged Ashast ofpaner Here we 90 1, First fold a sheet inte two, 2, Fold tne doubled-up straight edge (180 degrees) into three equal pats of BD dagtess Each. 3. Ensure ‘hat the double edges are fish with tha folds tobe crowsed. 4, Fold tre six-layer corner into atiangl. 6. Ontolaing several parallel croases and opening Lunyoutl see a sat of nesting hexagons. ‘Tne nesung Foxsgons resemble a cobweb EX h aS L 3 10 Folding an Octagon Ate the pentagon and haxegon, we ean naturaly ove on to the cotagon. You wll noed, Asheetof paper Herewo go 1, Folda sheetinst into two, 2. Then intofour "