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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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Change of State

The Change of State Concept Builder is a tool that allows the learner to predict how the individual forces must change in order for the state of motion of an object to change. Learners make decisions about removing a force, reducing the strength of a force, increasing the strength of a force, or adding a force in order for the final Force Diagram to be consistent with the proposed change in the state of motion. There are 12 different situations and two different levels of difficulty. In each situation, the learner is presented with a verbal description and a Force Diagram; they are given the proposed change in the motioni and must identify the correct Force Diagram (from a selection of five options) that is consistent with the proposed change of state. Question-specific help is provided for each of the 12 situations. The built-in score-keeping makes this Concept Builder a perfect candidate for a classroom activity.

Users are encouraged to open the Concept Builder and begin. There is no need for an activity sheet for this Concept Builder.

Learners and Instructors may also be interested in viewing the accompanying Notes page. Technical information, teaching suggestions, and related resources that complement this Interactive are provided on the View Notes.

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