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Physics Classroom is making strides to make our site accessible to everyone. Our site contains 6 navigation areas. The Primary, Secondary, and Page Level navigations have a screen reader version of their nav structure that allows using the left and right keys to navigate sibling navigation items, and up or down keys to navigate parent or child navigation items. The others can be navigated using tabs. The Primary Navigation handles the first 2 levels of site pages. The Secondary (which is not always available) handles the 3rd and 4th level of structure. The Page level navigation allows you to navigate the current page's headings quickly. The Header Navigation contains the Light/Dark Mode toggle, Search, Notifications and account login. The Breadcrumb Navigation contains the breadcrumb of the current page. If the current page has a breadcrumb, you can get to it by skipping to the content and tabbing in reverse (shift plus tab). The Footer Navigation contains links such as Privacy, Contact, about and terms. Some resources contain an Audio Player that can be activated by holding down the T key for 3 seconds, and then using K to pause and resume. While not every area of Physics Classroom is usable purely from keyboard and screen reader, we are committed to continue work on making this possible. If you have questions or need additional help, please use this link to contact us.

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Charge and Charging - Directions

Using the Charge and Charging Concept Builder is quite simple. There are three different activities, each with a different emphasis. In each activity you will be presented with a question that you will have to answer. In the first activity - Particle Count - you will be presented with a description of an object's charge and asked to compare the relative number of protons and electrons. You will tap on one of the three answer choices - equal (=), greater than (>), or less than (<). Once you have selected and tapped on an answer, a Check Answer button appears. Once you are satisfied with your answer, tap on the Check Answer button. Your answer will be evaluated and your Progress Report will be updated.

In the second activity - Get Into the Flow - you will be presented with a description of a neutral object becoming charged (either positively or negatively) or with a description of a charged object becoming neutral. You will have to identify how the change occurred - either by the gain or loss of electrons or the gain or loss of protons. You will tap on one of the four choices. Once you have selected and tapped on an answer, a Check Answer button appears. Once you are satisfied with your answer, tap on the Check Answer button. Your answer will be evaluated and your Progress Report will be updated.

In the third activity - Analyze This! - you will be provided a description of two objects' charged state before and after an electrostatic procedure. You have to compare the number of protons and electrons in each object before and after the procedure. And you will be asked to provide the explanation for what happened in order for one of the objects to have become charged. Once you have selected and tapped on all five answers, a Check Answer button appears. Once you are satisfied with your answers, tap on the Check Answer button. Your answer will be evaluated and your Progress Report will be updated.

Your goal is to earn "Stars" and to complete one or more levels of difficulty. Stars are earned when you show success on a particular question. Once you show success on all the questions at a particular difficulty level, you will earn the Trophy for that level.

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