Science Project on “A Pen That Jumps”, Project Experiment Topics on Electricity, Magnetism Gravity for Class 8, 9, 10 and 12 Students.
A Pen That Jumps
Materials Required:
- A pencil
- A square of paper, 6 inch x 6 inch
- A tape rubber band
- A ballpoint pen with cap (as in the illustration)
A pen can be made to jump back into its cap, as though pulled by a invisible hand, a magnet or a rubber band.
Take the pencil and roll a square of paper around it, like a tube about six inches (15cm) long. Tape it.
Now tape the end of a rubber band to one end of the empty tube, as shown in the illustration and then push the rubber band into a tube.
Procure a ballpoint pen with a cap shaped, as in the illustration.
Point first. Insert the pen into the tube.
Go through the motion of trying to hook its pointed end on the rubber band.
Take the pen some way out of the tube. It zooms back into the tube, as it jerked by the rubber band.
Just as you squeeze a watermelon seed, your fingers squeeze the pointed cap.
The illusion created is that something is pulling on the pen. Once you hand over the pen to a friend, he or she will continuously try to make it go back into the tube, without success.
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