This webpage demonstrates electric force exerted by positive and negative charges through a simulation of the behaviour of an electron in the presence of a proton. The concept is explained in the form of a conversation...
In this activity from the AAPT/PTRA manual "Role of the Laboratory in Teaching Introductory Physics", students are asked to find the condition for maximum power transfer from a power supply to a load resistor. By...
In this activity from the PTRA manual "Role of the Laboratory in Teaching Introductory Physics", students predict the landing point of a pendulum bob if its string is cut at the bottom of its swing. Energy...
This Physlet--one of many Java applets on physics phenomena--shows the waves produced by a moving object whose speed is controlled by the user. The circular waves radiate out, and the observed change in wavelength when...
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