A big part of the work-energy theorem is being able to calculate the work done by...

  

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A big part of the work-energy theorem is being able to calculate the work done by all of the forces external to your system. In this class, we use the full definition of work: W Fas =/ Pabdš rather than the colloquial "work equals force times distance," which is not only vague, but also not true in general. For example, using the full definition of work, determine whether the following statements are true or false. False For a person pushing with a constant, horizontal force on a book on a level table, the magnitude of the work done by the force of the person's hand on the book is equal to that force times the distance moved by the center of mass of the book. True For a person pushing with a constant force down at an angle on a book on a level table, the magnitude of the work done by the force of the person's hand on the book is equal to that force times the distance moved by the center of mass of the book. False For a block sliding down an incline plane, the magnitude of the work done by the normal force of the incline plane on the block is equal to that force times the distance moved by the center of mass of the block. True For an ice skater pushing off a wall, the magnitude of the work done by the normal force from the wall on his hands is equal to that force times the distance moved by the center of mass of the ice skater. True For a block hanging from an ideal spring that starts at the equilibrium position and moves down toward its minimum position, the magnitude of the work done by the force of spring on the block is equal to that force times the distance moved by the center of mass of the block. Opts Submit Answer Incorrect. Tries 6/15 Previous Tries A big part of the work-energy theorem is being able to calculate the work done by all of the forces external to your system. In this class, we use the full definition of work: W Fas =/ Pabdš rather than the colloquial "work equals force times distance," which is not only vague, but also not true in general. For example, using the full definition of work, determine whether the following statements are true or false. False For a person pushing with a constant, horizontal force on a book on a level table, the magnitude of the work done by the force of the person's hand on the book is equal to that force times the distance moved by the center of mass of the book. True For a person pushing with a constant force down at an angle on a book on a level table, the magnitude of the work done by the force of the person's hand on the book is equal to that force times the distance moved by the center of mass of the book. False For a block sliding down an incline plane, the magnitude of the work done by the normal force of the incline plane on the block is equal to that force times the distance moved by the center of mass of the block. True For an ice skater pushing off a wall, the magnitude of the work done by the normal force from the wall on his hands is equal to that force times the distance moved by the center of mass of the ice skater. True For a block hanging from an ideal spring that starts at the equilibrium position and moves down toward its minimum position, the magnitude of the work done by the force of spring on the block is equal to that force times the distance moved by the center of mass of the block. Opts Submit Answer Incorrect. Tries 6/15 Previous Tries

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atrue The work done by a constant force is equal to force times the displacementHere ... View the full answer