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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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Home Interactives Circular and Satellite Motion Gravitation Concept Checkers Gravitational Fields Concept Checker Launch

Gravitation Concept Checkers

The Concept Checker is shown in the iFrame below. If you have a Task Tracker account, make sure that you are logged in. Return to the simulation as needed.

You can resize the interactive by slowly dragging the dashed lines to the right of the interactive.
Having problems staying logged in or are you experiencing issues? Please visit our troubleshooting section for solutions (opens in a new tab).
Open Interactive (opens in a new tab)