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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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Linear and Angular Velocity - Directions

Using the Linear and Angular Velocity Concept Builder is quite simple. There are three different activities, each with a slightly different emphasis. In each activity you will be presented with a question that you will have to answer.

In the first activity - Turntable Physics - you will be asked to determine the location at which the angular velocity or the linear velocity is greatest. You have three answer options - A is greatest, B is greatest, and Both the same. Tap on one of the options (or the Radio Button to the left of the option) to select it. If you change your mind, you can tap on a different option to select it instead or tap on the selected option to deselect. As long as an option is selected, a Check Answer button appears. If you are satisfied with your answer, tap on the Check Answer button. Your answer will be evaluated and your Progress Report will be updated (for Task Tracker users).

In the second activity - Case Studies - you must determine how many times greater than or less than is the linear or angular velocity of Case A compared to Case B. You select your answer by tapping on the button labeled (initially) Tap Me to Toggle Through Answer Options. There are five answer options, tap to toggle through each option. Once you've viewed all five options it will cycle through from the beginning. You can view which option it is (a number) in the field below the button - e.g., Displaying Option 3 of 5. Once you are satisfied with your selection, tap on the Check Answer button. Your answer will be evaluated and your Progress Report will be updated (for Task Tracker users).

In the third activity - Do the Math - you are given information about the rotation of an object and you must determine the correct expression for calculating the linear or the angular velocity. You have five answer options to choose from. Tap on one of the options (or the Radio Button to the left of the option) to select it. If you change your mind, you can tap on a different option to select it instead or tap on the selected option to deselect. As long as an option is selected, a Check Answer button appears. If you are satisfied with your answer, tap on the Check Answer button. Your answer will be evaluated and your Progress Report will be updated (for Task Tracker users).

Your goal is to answer questions, earn "Stars" (Task Tracker users), and to complete one or more activities. Stars are earned when you show success on a particular question. Once you show success on all the questions for a particular activity, you will earn the Trophy for that activity.

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