Science Project on “The Magic Propeller”, Project Experiment Topics on Electricity, Magnetism Gravity for Class 8, 9, 10 and 12 Students.
The Magic Propeller
Materials Required:
- Two pencils
- A file and a pin
- A rectangular piece of cardboard
Cut notches along the edge of a pencil. Stick a pin through the centre of the cardboard and attach it to the pencil’s eraser, as in the illustration.
The hole in the “propeller” must be a bit larger than the pin, in order to cut down on friction. In your left hand, hold the end of the pencil. With your right hand, rub the second pencil back and forth across the notches, as in the second illustration.
If the tip of your first finger slides along the right side of the notches, the cardboard “propeller” will rotate rapidly towards the left. If the pencil being rubbed is moved a trifle forward, so that the tip of your thumb now slides along the left side of the notches, the “propeller” will stop and start turning towards the right!
The movement of the right hand is undetectable. This allows you to command the propeller to rotate first one way and then the other, without revealing how you do it.
Actually the propeller spins because of the horizontal, or back and forth, vibrations in the notched pencil as you run the second pencil over it. These horizontal vibrations have a specific oscillation pattern that create vertical, or up and down vibrations in the pin and these vibrations take the form of circular or elliptical motion, which causes the propeller to spin.
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