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A ratchet consists of a round gear or a linear rack with teeth, and a pivoting, spring-loaded finger called a pawl (or click, in clocks and watches [1] [2]) that engages the teeth. The teeth are uniform but are usually asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge.
A pawl is used in an anchor windlass to prevent a free-spooling chain by grabbing and snubbing an individual link. Similar mechanisms include a Devil's claw, or a claw and dog. Ratchet A pawl is used in combination with a ratchet gear in socket wrenches, bicycle freehubs, winches, ratchet reels for diving, fishing, and many other applications ...
Schematic figure of a Brownian ratchet. In the philosophy of thermal and statistical physics, the Brownian ratchet or Feynman–Smoluchowski ratchet is an apparent perpetual motion machine of the second kind (converting thermal energy into mechanical work), first analysed in 1912 as a thought experiment by Polish physicist Marian Smoluchowski. [1]
Adapted physical education is the art and science of developing, implementing, and monitoring a carefully designed physical education. Instructional program for a learner with a disability, based on a comprehensive assessment, to give the learner the skills necessary for a lifetime of rich leisure, recreation, and sport experiences to enhance physical fitness and wellness.
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Some examples of creating the least restrictive environment for students with learning disabilities include providing an audio recording of instructions or passages, providing text with a larger font, reducing the word count per line of text, and having a designated reader to give the written directions aloud to the student. More examples ...
An eligible student is any child in the U.S. between the ages of 3–21 attending a public school and has been evaluated as having a need in the form of a specific learning disability, autism, emotional disturbance, other health impairments, intellectual disability, orthopedic impairment, multiple disabilities, hearing impairments, deafness ...
Written by a speech-language pathologist and a learning disabilities educator, Teaching with Calvin and Hobbes is a language textbook for elementary and intermediate-level students. [1] [2] Jan Roebken created the cover and additional interior illustrations. [1] The book reprints fifty-seven Calvin and Hobbes comic strips, organized into five ...