PHY ICS - The Institute of Physics in Ireland

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The water lens The Czech Republic Lenses can be made of many different materials You will need... ✔ a glass of water ✔ a piece of card with an arrow drawn on it Background This demonstration shows the inversion of images and also that lenses can me made from several materials other than glass. Follow these steps 1 Place the card behind the glass of water. 2 View the arrow through the water. So what happened? The direction of the arrow is reversed when viewed through the water. This is a simple way to introduce the way in which lenses work. What next? Further work can be done by producing ray diagrams for the water lens. light 31 PHYSICS ON STAGE 3
32 light Disappearing crystals Ireland An intriguing introduction to refraction and refractive index Follow these steps 1 Soak a few of the crystals in lots of water. Water that has been boiled and cooled works best as the gel formed contains fewer air bubbles, which are easily visible because the refractive index of air is so different from that of water. PHYSICS ON STAGE 3 2 Use a spoon to transfer some of the gel to the net bag. 3 Tie the bag at the top with string and lower it into the container full of water until it is completely immersed. 4 Note what happens to the appearance of the gel in air and in water. Background The speed of light depends on the type of material that it’s travelling through. You will need... ✔ a container of water ✔ a small net bag to hold crystals (e.g. the type in which vegetables and fruit are often sold) ✔ a piece of string to secure the net ✔ Chempak Supergel crystals or equivalent (sold in garden centres to conserve water in hanging baskets, etc) ✔ a spoon So what happened? The gel is visible when held in the net bag in air. However, when immersed in water the bag looks empty. The refractive index of the gel is the same as that of the water. When immersed in water, light is not refracted at the junction between the gel and the water, so the junction can’t be seen. What next? Explore the refractive index of various materials.
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PHY ICS on Stage 2 & 3 on Stage 2 &
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Foreword It is a pleasure to introd
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PHYSICS ON P R ESTAGE S S U R 2E Ph
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1 2 3 4 5 6 7 8 CP OR NE ST SE UN R
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I N T R O D U C T I O N v The Irish
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P R E S S U R E Demonstration of at
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Bernoulli effect 1: ping-pong ball
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The Bernoulli effect 3: the slipstr
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The atmospheric karate chop IRELAND
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P R E S S U R E 9 ‘Heron’s Foun
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Newton’s third law For every acti
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To show air has mass SPAIN: ‘Teac
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Surface tension - ‘water-knot’
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The paperclip and the falling teacu
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The inclined plane This apparatus c
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F O R C E S To show that vertical a
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D E N S I T Y To demonstrate the ef
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The sinking orange IRELAND: The ora
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The boat and ball IRELAND: The boat
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Submarine model to demonstrate dens
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The balloon that doesn’t burst SP
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WAVES & SOUND Jenga Blocks: to show
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To show sound is a waveform GREECE:
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Diffraction using fingers IRELAND:
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EASY COLOUR 2: Colour mixing - all
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L I G H T EASY COLOUR 4. Red light
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Estimating the speed of light from
Page 57 and 58: Geometric optics with a laser point
Page 59 and 60: E L E C T R I C I T Y & M A G N E T
Page 61 and 62: M I S C E L L A N E O U S Gedanken
Page 63 and 64: Can you pick up a cube of ice with
Page 65 and 66: Electroless plating Background Elec
Page 67 and 68: M I S C E L L A N E O U S Some exce
Page 69 and 70: Answers to thought experiments with
Page 71 and 72: Demonstrations and teaching ideas s
Page 73 and 74: PHYSICS ON STAGE 3 Team and contrib
Page 75 and 76: PHYSICS ON STAGE 3: The conference
Page 77 and 78: PHYSICS ON STAGE 3: Acknowledgement
Page 79 and 80: 2 pressure Can you feel the force?
Page 81 and 82: 4 pressure Pressure with a differen
Page 83 and 84: 6 forces Water rocket Austria Break
Page 85 and 86: 8 forces Has Newton’s Law gone wr
Page 87 and 88: 10 forces Can you balance six nails
Page 89 and 90: 12 forces Anyone for tennis? Belgiu
Page 91 and 92: 14 forces Which syringe is easiest
Page 93 and 94: 16 forces Soap bubbles and films: 2
Page 95 and 96: 18 forces Moments on a wheel The Cz
Page 97 and 98: 20 density The mystery of the vanis
Page 99 and 100: 22 heat Making a turbine from a pla
Page 101 and 102: 24 waves & sound Standing waves in
Page 103 and 104: 26 waves & sound Kundt’s tube Lux
Page 105 and 106: 28 light Which one is the tonic wat
Page 107: 30 light Real depth and apparent de
Page 111 and 112: 34 light How to make a wooden mirro
Page 113 and 114: 36 light Investigating colour Irela
Page 115 and 116: 38 light Hot headlamps The Czech Re
Page 117 and 118: 40 light Words in a tube The Czech
Page 119 and 120: 42 light How the eye works, continu
Page 125 and 126: 48 electricity & magnetism The elec
Page 127 and 128: 50 electricity & magnetism Seeing a
Page 129 and 130: 52 electricity & magnetism The Darl
Page 131 and 132: 54 miscellaneous Bottle race Belgiu
Page 133: 56 miscellaneous The Coriolis effec
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PHY ICS - The Institute of Physics in Ireland

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