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|TCode||TACtivity Name||TACtivity Description||Packs|
|CP06||Matter – Evaporative Cooling||Evaporative cooling is a process in which a liquid evaporates from a surface, thereby reducing the surface temperature. During evaporation, the vapour leaves the surface, by using the heat of the surface to gain kinetic energy and evaporate, i.e. leave the surface. This cools the surface due to the reduction in its temperature.|
In this TACtivity, you will get to light up a piece of paper using a water-propanol mixture. Will the paper burn up?
|PACK OF 4||PACK OF 10|
|CM05||Mixture – Chromatography||There are various methods to separate all kinds of mixtures. One of the most interesting and “colourful” methods of separation is one known as Chromatography, where different pigments interact with a specific material in different ways and so the pigments separate. Here, we use a few different coloured sketch pens to colour a small area on a filter paper. Water is then drawn up using a wick and the colours separate at different radii as they interact on the wet filter paper|
|CM02||DIY Centrifuge||A centrifuge is a device that uses rapidly spinning containers, to separate substances based on their density. The apparent centrifugal force pushes the denser materials to the extreme ends of the container while the less dense materials remain nearer the centre.
In this remarkable creation of Prof. Manu Prakash from Stanford University, we make a “centrifuge” using just cardboard, cotton thread, vials and a button. With one’s own hands, one can wind the thread and spin the cardboard at about 3000-4000 rpm, and easily separate certain colloidal mixtures, such as muddy water and even blood!
|PM27||Electroscope||An electroscope is a classic instrument that can detect the presence of charge on a body. It uses the principle that like charges repel, demonstrated by two metal foils moving away from each other when a charge is induced on them.
Here, you will make your electroscope using aluminium foil and a copper coil, and observe by how much the foils separate when a charged object is brought near the copper coil
|BP23||Plant Life – Transportation||How does water climb about 100 metres to reach the leaves of the great Redwood pines? Using some filter paper, straws, a wooden skewer and food colouring, this TACtivity models the transportation in a plant. This model helps to understand the movement of water and minerals to the functional area of the tree i.e., leaves.|
|PF01||Straw Propeller||Newton’s Third Law of Motion is one of the most beautifully succinct laws. So much so, that it seems obvious to most who read it. However, few really understand the law and this TACtivity – made by inserting a thin straw through holes made in the middle of a fat straw – goes a long way in addressing many of those misconceptions and clarifying several other fundamental concepts in physics.||PACK OF 6|
|PM11||Magnetism – Levitation||Observe a pen appearing to float in air because of forces from different directions balancing it.
Mount two magnets on a pen about 2 cm from each end. On a foam piece, create slots and insert four magnets in a specific orientation. Insert an ice cream stick piece at one end and levitate the pen horizontally! The polarity of the magnets is critical to this TACtivity.
|CP29||Density – Shrink & Sink||The density of an object is nothing but the ratio of its mass to its volume. In a fluid, objects that are less dense than the fluid will float, whereas those denser than the fluid will sink. In this TACtivity, a balloon is partially inflated and a nut is suspended from it with a thread such that the whole assembly floats in water. This is then inserted into a plastic bottle filled to the brim with water and closed tightly shut. When you squeeze the bottle, the balloon should start to sink! How and why?|
|PF34||DIY Spring Balance||Based on the beautifully fundamental Hooke’s Law, which states that the amount by which a spring expands is directly proportional to the force stretching it, the spring balance is a classic tool used to measure weight.
Here, you make your very own spring balance(s), mounted on a cardboard frame, using several kinds of “springs”.
|PE06||Wind Turbine Model (B)||Humans have learnt how to harness energy from various sources, to make certain tasks mechanised, produce electricity etc. The energy is often harnessed through the use of turbines. In an increasingly warming planet, it is imperative that we expand our capacity of harnessing renewable sources of power. One such example is a Wind Turbine.
In this TACtivity, we make a Wind Turbine Model using foam and ice-cream sticks, which are placed at different angles to observe its effect on the speed of the turbine when held under a fast-spinning ceiling fan.
|PS02||DIY Diaphragm Headphone||How do speakers convert an electrical signal to sound? While commercial speakers and their functioning might look complex, they all use the same fundamental principle and components. Electric signals going through a wire create a magnetic field. By keeping a magnet near the coil, it interacts with the electric pulses and vibrates. This vibration is captured by a diaphragm, which then amplifies it, and this vibration manifests as sound!
In this astonishing TACtivity, you make your very own speaker using a container, some copper wire, a neodymium magnet and a paper diaphragm, which you can connect to any audio source using an audio jack, and listen to any kind of music you like!
|BE04||Flexagon – Nitrogen Cycle||Starting with an A4 sheet of paper, we convert it to a size such that its length:breadth is 2:1. Making various folds and creases on this paper, it is possible to mould it into a “3D Flexagon” with 4 faces, and on each face you may depict one step of the nutrient cycle with the template provided, and make more examples of your choice on the blank template.|