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.
Related Resources:
Teacher Demo: Turning Water into Wine into Milk into Beer
Categories: Teacher Demonstration
Turning water into wine and then into beer and finally milk is an extremely versatile chemistry demonstration. It can be used to introduce or reinforce several important concepts in chemistry... read more
Teacher Demo: Acid-Base Rainbow
Categories: Teacher Demonstration
This quick demonstration is a highly visual illustration of the use of acid-base indicators to determine pH. Milk of magnesia is mostly a suspension of magnesium hydroxide in water. Magnesium... read more
Student Activity: Counting Atoms and Molecules
Categories: Lab/Student Activity, Teacher Demonstration
Chemists are constantly faced with the daunting task of counting large numbers of items, specifically atoms, ions, molecules and compounds. This task is made even more difficult by the fact that not... read more