A pendulum is constructed from a 1.0-kg mass suspended from the ceiling, with a length of strong string long enough so that, when pulled about 40o from the vertical, the mass comes to nose level. The pendulum will be released from this position. The demonstrator is to remain absolutely still until the pendulum makes at least one full cycle. This very-simple-to-perform demo can be made very memorable by playing up the drama. The possibility of seeing the teacher’s blood will excite the class. It will even test one’s faith in the laws of Physics.
Cells require a constant supply of glucose and oxygen to produce energy. Cellular respiration occurs in the mitochondria of a cell. As a result of this process, large quantities of waste carbon... read more
In this demo, a polyethylene strip is charged by rubbing with wool. The strip is then used to test what happens to the flow of charge when the strip is placed in contact with a conductor (iron nail)... read more
This demo shows how flakes of iron can be extracted from iron-fortified cereals with the use of a strong magnet. The demo shows a physical separation process and provides students with a good example... read more