Rolling Backward Materials Required: Two cardboard disks of about 3 inch (7.5 cm) An empty wooden spool Some strings Cut out the disks from a cardboard. Use glue to stick them to the ends of an empty wooden spool. Take the string and wrap some around the spool. Now pull the free end as in the illustration. The question is will the spool roll away? Come towards you or will it...

Magnetic Forces Materials Required: A strong magnet Stapler pins Two glasses Two books A pencil A cylindrically shaped balloon A freezer A ruler An invisible form of energy, magnetism can actually pass through air. But the question is – can magnetism also pass through water? What is the essence of water as ice? Would that affect magnetic forces? To find out, fill a cylindrical shaped balloon with water. Remember that you...

Inertia that Sticks Materials Required: A matchbox A paper match A cylindrical cork Three impossible feats can be pulled off, if you can be a little sneaky. It is fun and a great source of entertainment for your friends. Consider these three feats: 1.Drop a matchbox from a height of six inches(15 centimetres) over a table top, so that it lands on its end and remains upright. 2.Drop a paper match...

How to Defy the Gravity Materials Required: An empty plastic bottle A sharp pencil In a gravitational field, everything falls at the same speed, no matter what its weight is or what it is made of. Gravity disappears inside a free-falling container. This is one trick that should preferably be performed outdoors. Make two holes on opposite sides of a plastic bottle, near the bottom, with a sharp pencil. Fill the...

Hanging a Bottle Materials Required: A Coke bottle Uncooked rice Use the uncooked rice to fill a Coke bottle tightly. Insert a pencil, a chopstick or a rod along the neck of the bottle, into the rice. You will find that when you lift the pencil, the bottle comes with it! Chances are that you may need to try out several times, before it sticks in the rice. Give the pencil...

Force Fields Materials Required: An adult A hammer Safety pin Glass jar Magnet Thread Adhesive tape A magnet is an object surrounded by a field of currents and has the property of either attracting or dispelling metals, such as iron or steel. When you throw up an object in the air, the force of gravity pulls it down towards the earth. These two invisible forces are very strong, but which of...

Electromagnets and Compasses Materials Required: Some insulated copper wire A three inch nail A 9-volt battery Some small nails A piece of cardboard Two needles A bar magnet A cork To make an electromagnet some insulated copper wire, all along the length of a three inch nail, without overlapping the wire. Strip and connect the two ends of the wire to the positive and negative terminals of a 9-volt battery. If...

Distributing the Pressure Materials Required: A cardboard tube A rubber band A piece of tissue paper Grains of uncooked rice This is one riddle, you need to take a look at. The question is why doesn’t the tissue paper break, even if you press down on it. Take the square of tissue paper and attach it to one end of a cardboard tube using a rubber band. Now hold the tube...