Can two switches control a light from two different locations? Find out in this experiment.Things Required:Two “D” cells in battery holdersOne torch bulb in lamp holderSix thumbtacksTwo metal paper clipsTwo pieces of wood or thick foam coreConnecting wires with each end stripped 1½ inches bare of insulationDirections:For this activity, you’ll need to build two new […]
A hanger is good to hang clothes on it. Wrong, you can also build an incredible sound-making device from a hanger? Here’s how.Things Required:Metal clothes hangerKite stringMetal spoonTwo paper clipsTwo paper cupsPair of scissorsPushpinDirections:Use a pushpin to punch a hole into the bottom of a paper cup. Cut two segments of kite string, each about
Does gravity pulls all things down at the same speed? Let’s check it out in this experiment.Things Required:PaperBook larger than the paperDirections:Hold the paper in one hand and the book in the other. Drop the book and the paper at the same time. Observe the paper and book as they fall and strike the floor.
Electricity carrying cables are often buried underground. To locate their exact position, utility workers use a tool that detects magnetic fields. Within the cables, a current of flowing charges produces a magnetic field that extends into the surrounding space. By uncovering this magnetic field, workers can locate the exact position of the unseen electric flow.Things
Imagine five empty match boxes positioned one right after the next. Push over the first match box and what happens? The first match box falls into the second. The second falls into the third. The third falls into the fourth…Imagine the tiny particles (atoms and molecules) that make up a kite string. In a similar
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A parachute is an umbrella-like device for slowing the descent of a body falling through the atmosphere. Separate panels sewn together form a canopy attached by suspension lines to a harness worn by the user. Originally designed to provide a safe escape from a disabled aircraft, parachutes are also used for dropping supplies and for
Have you ever played the electrified board game in which you must operate on a patient? If your hand isn’t steady, the forceps strike the conducting metal. Instantly a loud sound confirms that you “grounded out” and completed your turn. In this experiment, you’ll have the chance to build another type of game that also
Have you ever looked closely at a saxophone, clarinet mouth-piece or shehnai? If so, you probably observed that the mouthpiece contains a thin piece of wood. This part of the instrument is called a reed. When you blow across the reed, you set it vibrating. It’s this back-and-forth movement that produces the sound. As these
Purpose to determine the effect that the centre of gravity of an object has on motion.Things Required:2 yardsticks (meter sticks)3 books, each at least 1 inch (2.5 cm) thickMasking tape2 funnels of equal sizeDirections:Put two books 30 inches (90 cm) apart on the floor. Place the remaining book on top of one of the other
In movies you must have seen that the alarm goes on the moment an intruder opens a door. In this experiment, you can make it for yourself.Things Required:Connecting wires with each end stripped 1½ inches bare of insulationSimple buzzer circuit5 inches × 3 inches cardboardPair of scissorsMetal paper clipTapeTwo metal thumbtacksStringSmall square piece of paperDirections:Cut
Let’s be critical. Fill a plastic bag full of water. Seal the bag and listen through it by placing your ear against its surface. Which type of matter did the sound have to travel through in order to reach your ear?solid; b) liquid; c) gasIf you answered “liquid,” you’re only partially correct. The sound was
The purpose of this easy experiment is to determine how the buoyancy of a substance can be changed.Things Required:Drinking glassClub sodaModelling clay Directions:Fill the drinking glass three-quarters full with soda. Immediately, add 5 tiny balls of clay one at a time. The clay pieces must be about the size of a rice grain. Wait and
Alarm systems are great, especially the high-tech ones that detect an intruder by the heat he or she gives off. In this experiment, you’ll get to construct an alarm device and use it to assemble a circuit.Things Required:Two connecting wires with each end stripped 1½ inches bare of insulationSimple buzzer circuit10 inch × 3 inch
In order to produce sound, you need something to vibrate. Matter is that something. It’s the “stuff’ that the universe is made of. But will all matter transmit sound? Are there only certain particles that can pass these sound waves along? Let’s find out.Things Required:Three plastic sealable bagsSand (sugar or flour can be substituted) waterCoin
You may have seen large ships made of metal or other materials floating in water instead of sinking, In this experiment, we are going to find out how a heavy ship floats.Things Required:20 paper clipsAluminium foilRulerBucket of waterDirections:Cut two 12 inches (30 cm) squares from the aluminium foil. Wrap one of the metal squares around