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Categories: Teacher Demonstration
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... read moreCategories: Lab/Student Activity
If equilibrium is to be achieved, opposing reactions must take place in a closed system at the same rate. The two reactions, known as forward and reverse reactions, shown by a general reaction such as: A + B C When the forward and reverse reactions are taking place at... read moreCategories: Teacher Demonstration
A head on elastic collision between an object with mass M and an object with mass 3M traveling with equal speeds results in all the kinetic energy of the system being transferred to the smaller mass. In this demonstration we try to follow this arrangement to produce a... read moreCategories: Teacher Demonstration
Most of us know from experience that the force of friction caused by air resistance increases as the relative speeds increases. The purpose of this activity is to develop a proportionality statement, and then an equation, that describes the relationship between air... read moreCategories: Teacher Demonstration
This very simple to perform demo can be made very memorable by ensuring the students see it as a discrepant event. Students are expecting to see a free fall but instead see a low terminal velocity with no obvious source of friction. read moreCategories: Teacher Demonstration
Almost every child at one time or another has experienced the wonder, and later, a sense of loss, from a helium balloon. The emotional attachment most students have to helium balloons can be used to focus them on a variety of Physics concepts. Adjust the... read moreCategories: Teacher Demonstration
This demonstration shows the independence of the horizontal and vertical components of velocity. It can also be used to introduce frames of reference. The ballistic cart propels a steel ball out of the central pipe as it moves. This means that the ball projectile and... read moreCategories: Teacher Demonstration
This demonstration results in the isolation of DNA from banana. It is very useful for students to see DNA to bring some sense of physical reality to what can be a very abstract topic. read moreCategories: Teacher Demonstration
Osmosis, the movement of a solvent (usually water) across a semi-permeable membrane from an area of higher solvent concentration to an area of lower solvent concentration, is key in the maintenance of homeostasis. This demo shows osmosis across a semi-permeable... read moreCategories: 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 all atoms of the same element are identical. In this... read more