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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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Torque

The Torque Concept Builder focuses attention upon the variables that affect the amount of torque, the direction of rotation caused by a torque, the +/- sign of torque, and the meaning of lever arm. The Concept Builder consists of 48 total questions organized into 13 different Question Groups and spread across three Activities. In the first activity, Ranking Tasks, learners use information magnitude, direction, and placement of a force along a wrench in order to rank three situations from least to greatest torque. In the second activity, Torque and Rotation, learners use given information about the direction of a force applied to a seesaw to determine the direction of rotation of the seesaw and the sign on the resulting torque. In the third activity, Lever Arm, learners are given a top-view diagram of a door with the hinge, door knob, and a force vector (with varying directions) and they must identify the length of the lever arm (a.k.a., moment arm) on the diagram. Question-specific help is provided for each of the 13 situations. Use of this Concept Builder with our Task Tracker system allows teachers to track student progress.

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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