Example Problem Solutions from:

Engineering Mechanics: Statics & Dynamics

by R. C. Hibbeler
Tenth Edition, 4th Edition, Pearson Prentice Hall, Upper Saddle River, NJ 2004

Author's Homepage: R. C. Hibbeler

Chapter 14: Kinetics of a Particle: work and Energy

"In mechanics a force F does work on a particle only when the particles undergoes a displacement in the direction of the force. For example, consider the force F acting on the particle in Fig. 14-1. If the particle moves along the path s from position r to a new position rp the displacement is then dr � rp � r. The magnitude of dr is represented by ds, the differential segment along the path. If the angle between the tails of dr and F is q, Fig. 14-1, then the work dU which is done by F is a scalar quantity, defined by dU = F ds cosq. By definition of the dot produce (see Eq. C-14) this equation may also be written as dU = dot(F, dr)."

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