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physics_chapter6notes

physics_chapter6notes - Chapter 6 Work and Kinetic Energy...

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Chapter 6: Work and Kinetic Energy 6.1 Work Work – the amount of transferred by a force acting through a distance = W Fs or = W Fscosφ Scalar quantity The total work done on a particle by all forces that act on it equals the change in its kinetic energy —a quantity that’s related to the particle’s speed o This relationship holds even when the forces acting on the particle aren’t constant You do work by exerting a force on a body while that body moves from one place to another —that is, undergoes a displacement o You do more work if the force is greater (you push harder on the car) or if the displacement is greater (you push the car farther down the road) The SI unit of work is the joule (abbreviated J) = ( ) 1 joule 1 newton 1 meter Work: Positive, Negative, or Zero When the force has a component in the same direction as the displacement ( φ between 0 and 90°): The work on the object is positive.
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