DO IT YOURSELF SERIES
LEARN: Laws of gravity and pressure
Turbo Air - Floating Ball Learning Manual
LEARN: Laws of gravity and pressure This is a D.I.Y (do-it-yourself) educational science kit that provides useful knowledge about simple physics. “You'll be amazed� to learn realistic concepts of basic physical theory through exciting activities.
How it works? The 'Turbo Air – Floating Ball' works on a simple principle which is the faster air moves, the lower is the pressure in that region. The electric blower is actually just a fan connected to an electric motor. When you supply the motor with power the fan rotates. As the nozzle is the only outlet for the moving air produced by the fan the air gushes out of the nozzle at a high speed. The force due to the reduced pressure of the moving air causes the ball to rise upwards, till force of air completely balances the force of gravity. The ball stays suspended in air, floating as if magically.
Science Behind floating ball As we know moving air is accompanied by a reduced air pressure. The higher the speed of the moving air, the lower is the air pressure. The ball has a spherical shape. The air closer to the surface of the ball has to travel a greater distance over the circumference in the same time as compared to the air in the jet which just has to move on a straight line. Due to this, the surrounding air is at a lower pressure and it sucks the ball upwards. Close to the nozzle the speed of the jet is much more. The force of suction by the lowered pressure overcomes the weight of the ball and the ball rises upwards. The ball continues to rise till it reaches a point where two forces are balanced. There is another interesting phenomenon which keeps the ball pulled towards the stream of air. The air stream escaping from the nozzle has air moving at a high speed. As a result the air pressure inside the stream is lower than the pressure of the still air outside the stream. When the ball even slightly deviates from the stream of air it is automatically pulled back into the stream because of its low pressure. This way the ball stays in the stream even if it is displaced slightly.
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Do you know? The simple phenomenon that we used here to explain our floating ball is actually responsible for creating the lifting force that keeps an airplane flying! The wings of an airplane are designed so that the speed of airflow at the top is much more than that at the bottom of the wings. As a result, the air pressure at the top of the wings is lesser than the air pressure at the bottom, creating the much needed lifting force.
Quiz Q. Mark the correct answer(s) in each of the following I When air blows at a high speed (a) The pressure in that region increases (c) The pressure in that region decreases
(b) The temperature in that region decrease (d) The moisture content of air increases
II Reduced air pressure (as compared to the surroundings) can (a) Push an object (b) Pull an object (c) Lift an object III Which of the following works on the same principle as Turbo Air? (a) Airplane (c) Parachute (e) Submarine
(c) Hang Glider (d) Hot-air balloon
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Additional DIY Cone that collapses when you blow through it Materials required: 1. Small reel or plastic tube 2. Cello tape 3. Scissors 4. Newspaper Procedure: 1. Blowing slowly through a card reel on a candle flame deflects it in the direction of flow.
2. Blowing through a funnel on a candle flame brings it magically towards the blower.
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What do you observe? Why does it happen?
Ball that does not fall Materials required: 1. Bottle
2. Bottle cap
3. Scissors
4. Plastic
5. Rubber
6. Table tennis ball
Procedure: 1. Cut a small hole in the bottle cap using the scissors and hold a ping-pong ball in a cut bottle funnel .Then blow hard
2. Instead of dropping the ball stay in place!!
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3. Stretched plastic Membrane or balloon secured with rubber band and cut bottle funnel
4.
5.
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Tap Membrane to blow off the flame.
Air gushes and puts off the candle! Try increasing the distance to extinguish the candle.
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What do you observe?
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Why does it happen?
Manual :
Follow below steps as figure shown.
1• Install blower (01) on the box base (03).
2• Insert blow-nozzle (02) to the blower (01).
3• Install ON/OFF switch (05) on the box base (03).
4• Install battery compartment (04) on the box base (03).
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5• Install 3 spring connectors (7a, 7b, 7c) on the box base (03). Narrow end down and push the spring as far as it will go.
6• Connect the blower (01) to the spring connects, red wire to the spring connector (7b) and black wire to the spring connector (7a). 7• Connect red battery wire to the spring connector (7c) and black battery wire to the spring connector (7a).
8• Connect one wire of the ON/OFF switch to the spring connector (7c) and the other one connect to the spring connector (7b).
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Gallery: http://www.arvindguptatoys.com/toys/bernoulli.html http://www.youtube.com/watch?v=jxXPBOstpmE http://www.youtube.com/watch?v=j6yB90vno1E (This one should carry the caption “Airflow around a ball”) http://www.youtube.com/watch?v=6UlsArvbTeo (This one should carry the caption “Airflow around an airfoil”) first 51 seconds only.
How to play Insert 2pcs AA (LR6) size batteries to the battery compartment. Turn the switch on and put the foam ball (06) above the blow-nozzle. Now you can see the ball floating in the air. Ensure all wires are correctly connected to the battery terminals and spring connectors as stated in the instruction. Bend the spring connector over and insert the exposed shiny conductor part of wire into the spring connector. If the circuit does not work, make sure the insulated “plastic” part of the wire is not obstructing the connection to the spring connector, and make sure the wires are securely connected.
Warning ! Do not short-circuit the battery terminals and spring connectors. It may cause overheating. Do not lock the motor or other moving parts. It may cause overheating.
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If at any time in the future you should need to dispose of this product please note that waste electrical products should not be disposed off with household waste. Please recycle where facilities exist. Check with your local authority or retailer forrecycling advice. (Waste Electrical and Electronic Equipment Directive) An educational product by Mexus Education Pvt. Ltd.( formerly Axiom Education Pvt. Ltd.) Regd. Off.: No. 135 / 2 / A, Muktanand Marg, Chala, Vapi -396191 (Gujarat) Mumbai Office: 512, Midas, Sahar Plaza Complex, M V Road, J.B. Nagar, Andheri (E), Mumbai 400 059. For more information www.iken.in For Customer Care Contact: +91 922 322 4044 Email: help@iken.in For sales enquiry: sales@iken.in