Every Saturday we highlight three resources that have received particularly heavy traffic from website visitors during the past week. This week's winners are …
One of the most visited pages at The Physics Classroom this week was a page in our Circular Motion and Satellite Motion chapter of the Tutorial. Learners flocked to the Newton's Law of Universal Gravitation page all week long. The page introduces Newton's law regarding mass attraction and demonstrates its use both in thinking proportionally and in solving problems. Illustrations and sample problems are combined with logic-filled writing to help the reader understand the law at both the conceptual and mathematical level.
https://www.physicsclassroom.com/class/circles/Lesson-3/Newton-s-Law-of-Universal-Gravitation
2. Coulomb's Law Concept Builder
The Coulombs Law Concept Builder is a tool that allows the learner to predict the effect of varying charge and varying separation distance upon the electrical force with which two charged attract or repel each other. There are 16 different situations to analyze and three ability levels. Each situation requires that the learner use proportional reasoning and Coulomb's Law of Electrical Force in order to determine the force that would result when one or more of the object charges and/or the separation distance between objects is altered. Question-specific help is provided for each of the 16 situations. The built-in score-keeping makes this Concept Builder a perfect candidate for a classroom activity.
3. Gravitational Fields Interactive at The Physics Interactives
School administrators generally do not allow physics classes to take field trips to other planets to study gravitational forces. And it is rather difficult to change the mass of the earth or the moon in an effort to see if such changes have an effect upon the gravitational force. But with this Interactive, changing the masses of planets and moons and the distance that separates them is a snap. And by doing so, a learner can discover the law of universal gravitation without ever leaving home or school.
https://www.physicsclassroom.com/Physics-Interactives/Circular-and-Satellite-Motion/Gravitational-Fields
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