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Work and power class

work

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Work and power class

  1. 1. Work •Work- A force acting through a distance. •The distance that the object moves must be in the same direction as the force applied to the object. Lifting Force Movement Distance What force is having to be overcome by the lifting force? Weight
  2. 2. Work• Work- A force acting through a distance. • The distance that the object moves must be in the same direction as the force applied to the object. Pushing Force Distance Moved What force is having to be overcome by the pushing force?
  3. 3. Lifting Force Movement Distance • Work is not done every time a force is applied. • Work is done only when a force moves an object in the same direction as the applied force. Is the man doing work when he lifts the box? Yes. Is the man doing work when he holds the box? No! Is the man doing work if he carries the box? No! (But he IS applying a force) (But he IS applying a force)
  4. 4. Work Think about pushing on wall that does not move. A force is applied but the wall has not moved a distance. Is work done?
  5. 5. WorkThink about pushing on wall that does not move. A force is applied but the wall has not moved a distance. Is work done? No! But I did expend energy applying a force!

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