Review Sheet _4

# Review Sheet _4 - Rev 2 REVIEW SHEET#4 Work Kinetic...

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Rev. 2 REVIEW SHEET #4: Work; Kinetic & Potential Energy; Energy Conservation Definitions: Work (a scalar) is the scalar product of force and displacement cos W F d F d θ = = r r r r (The above expression applies to cases where the force is constant.) W=0 unless there is a displacement component parallel to the force direction. Work can be positive (if θ is between 0 and 90°) or negative (if θ is between 90° and 180°). The total work done on an object by all of the external forces acting on that object is equal to the work done by the net external force: ( 29 ext total W F d = r r Kinetic Energy (a scalar) 2 1 2 K mv = (m=mass, v=velocity; K is never negative) Work – Kinetic Energy Theorem: the total work done on an object by all external forces is equal to the change in the object’s kinetic energy: total final initial W K K K = ∆ = - Gravitational Potential Energy (a scalar) : U g = mgy (m=mass, y=height above a reference level; this expression applies near the earth’s surface where g is constant

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Review Sheet _4 - Rev 2 REVIEW SHEET#4 Work Kinetic...

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