Materials required: -vessel twine and wrist watch.

Tie the twine with the Iota and suspend it from above. The length of twine from the point of origin to the middle of the Iota is one metre. This is a type of pendulum.

Oscillate this Iota from one side to another. When it goes and returns to you, count it as 1. Find out how much time it takes for 20 oscillations. Calcula­te the time taken for one oscillation.  Next make the oscillation not so wide as before and calculate the time it takes for the same 20 oscillations. Calculate
the time taken for one oscillation now.  Does the time vary for each oscillation of the swing range or amplitude beco­mes shorter? Now pour water and fill 1/2 of it. Now calculate the time taken for one oscillation. Then fill 3/4th of it and calculate the time again for one oscillation

Is there any change in the time taken for each oscillation when the weight is changed? Then increase or decrease the length of the pendulum and calculate the time taken for each oscillation. Is there any change if the length is altered?

TAG: oscillations, pendulum, point of origin, science fair projects, Science Fair Project, science project

Materials required: - a big circular metal sheet, a small circular metal sheet (or a large tin lid and a small tin lid) nail, stone or hammer, string or ru­bber band and a foot square plank
Lay the two lids on the plank a little away from each other. Nail them to the plank and make them to revolve easily. Connect both the lids with a rubber band or string. Does it not look like a wheel? Rotate the big circle once and observe how many revolution the small one makes. Measure the circumference of the small circle. The distance traveled by the small wheel will be as many times this length as its revolution. If it revolved 5 times and the circumference was 20 cm., then the distance will be 5 x 20 = 100 centimeters. There are big and small teeth wheels in various machines. The teeth of one wheel are connected to the teeth of another: When the main wheel moves small wheel also moves. Watches and clocks work on the same principle.

TAG: gog wheel, Science Fair Experiment, Science Fair Idea, Science Fair Project, science fair projects

Materials required: stiff paper, a scale, paste, thread, scissors and an electric fan.
Make three card board tubes as shown below. 1. is a cylindrical tube. 2. is a square tube. 3. is a tube having the shape of dropping water. Tie up the three tubes separately on a common beam, or support. Let them hang where there is breeze; or use an electric fan. Which shape gets pushed very much and which is less? The flat surface gets pushed very much, the cylindrical tube gets pushed a little less, and the third one is the lea: t. You will notice that air resistance is very much reduced if the shapes has curved surfa­ces. That is why modern cars and locomotives, especially race cars and aero planes have got coni­cal cal and smooth curved surfaces. They have less air resistance and therefore they can move with a great speed.

TAG: air resistance, cylindrical tube, flat surface, Science Fair Experiment, Science Fair Idea, Science Fair Project, science fair projects, square tube, stiff paper