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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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Head-to-Tail Vector Addition - Directions

The Head-to-Tail Vector Addition Concept Builder is quite simple to use. Every question is identical. You are given a vector addition equation involving the addition of three vectors. A diagram of each vector is shown. You have to identify what the correct vector addition diagram looks like. There are six options to pick from. To view an option, you have to tap on the diagram shown below the equation. Each time you tap, a new answer option is displayed. After viewing all six options, additional taps recycle through the six options a second time from the beginning. Once you are satisfied with your selection, tap on the Check Answers button. Feedback will be immediate and your Progress Report will be updated. Your goal is to successfully analyze each of the Question Groups at each particular difficulty level.

There are three different levels of difficulty. Your goal is to earn "Stars" and to complete one or more difficulty levels. 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 medal for that level.

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