Rubbing erasers, hands and ice
With this experiment, students have the opportunity to learn more about the phenomenon of friction. Friction is a force that resists the relative motion of two surfaces or objects sliding against each other. Friction often results in the conversion of kinetic energy into thermal energy, which is indicated by increased temperature of the involved surfaces or objects.
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Knife and wooden spoon
Metal feels colder at room temperature than many other materials, such as wood or plastic. With this experiment, students are given the opportunity to explain this phenomenon as a consequence of the differing heat conductivity of involved materials. Whereas wood and plastic are thermal insulators, metals are good thermal conductors.
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