Every Saturday we highlight three resources that have received particularly heavy traffic from website visitors during the past week. This week's winners are …
Kepler's Three Laws at the Tutorial We've seen a lot of traffic to our circular motion and satellite motion pages this past week. One page that has seen a lot of attention is the Kepler's three laws page at our Physics Classroom Tutorial. The law of ellipses, the law of equal areas, and the law of harmonies are all described and illustrated using words and graphics. The page ends with a lengthy Check Your Understanding section. Learners are presented with questions whose answers can be quickly checked with the click of a button.
2. Charge and Charging Concept Builder
The Work Concept Builder is a tool that challenges learners to use an understanding of work and its relationship to energy to analyze numerous situations involving positive and negative work in order to identify the manner in which energy is changing and the forms of energy that are involved. There are 14 different situations to analyze and three different activities, each with its own emphasis. In Activity 1, learners identify whether a situation involves positive work, negative work, or zero work. In Activity 2, learners identify which force is doing work and whether the work contributes to a gain or loss in energy. In Activity 3, learners describe the forms or storage modes of energy that are involved in the situation. The built-in score-keeping makes this Concept Builder a perfect candidate for a classroom activity.
3. Aluminum Can Polarization at The Physics Interactives
The Aluminum Can Polarization Interactive allows learners to visualize the underlying cause for the attraction between a charged and an uncharged object. The uncharged object is an aluminum can at rest on a level surface. The charged object is either a glass rod or a rubber rod. The charged object can be brought near to the uncharged object and the resulting interaction is clearly observed. But more importantly, the response of electrons within the aluminum can is depicted in the animation.
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