This demonstration uses food and a series of containers and additives to model the process of mechanical and chemical digestion in the human (mammalian) digestive system. The demonstration begins with actual food items and ends with a paste closely resembling fecal matter. Due to the high “gross” factor, this demo is a hit with students and is guaranteed to be very memorable.
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Teacher Demonstration: The Force of Air Resistance and the Speed of an Object
Categories: 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,... read more
Teacher Demo/Student Activity: Potato Osmosis
Categories: Lab/Student Activity, Teacher Demonstration
Osmosis is the process by which the concentrations of two solutions, separated by a selectively permeable membrane, equalize by the movement of a solvent such as water. This demonstration shows that... read more
Teacher Demo: Ballistic Cart
Categories: 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... read more
