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11 th Grade ATC Lesson

Learn about work and the work-energy theorem in this 11th-grade ATC lesson. Understand the equation for work and how it relates to force and displacement. Answer questions on work calculation, comparing work done by different forces, and the relationship between net work and object speed.

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11 th Grade ATC Lesson

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  1. 11th Grade ATC Lesson Tuesday Jan. 10, 2012

  2. Instructions • Write notes on next slide. • Use notes to answer the questions that follow. • Don’t forget to turn in your work to your science teacher!

  3. Notes • Work is done when a force causes an object to move. • For work to be accomplished a force has to move an object and the force and displacement have to be in the same direction. • Equation for work : W = Fd

  4. Assignment • 1. How much work is done on a 55 N package you carry horizontally for a distance of 12 m? • 2. If a neighbor pushes a lawnmower four times as far as you do but exerts only half the force, which one of you does more work and by how much? • 3. Can the speed of an object change if the net work done on it is zero? Explain. • 4. Determine whether work is being done in each of the following examples: • A. a train engine pulling a loaded boxcar initially at rest • B. a tug of war that is evenly matched • C. a crane lifting a car.

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