ME 3133 Chapter : Lect 09 WorkEnergyBLANKS
Document Summary
Particle kinetics: quick review: newtons laws, work-energy formulations, power & ef ciency, conservation of energy next class. Newton"s laws: 1st law: particle motion equilibrium (aa = 0 ) r. F = ma: 3rd law: action <=> reaction. Wnw"s corollary: thou shalt draw a fbd! m. Other commonly useful laws: gravitational attraction. F f = s / k n ( e t ) => forces over a time interval & impact: one objective of newton"s laws is to determine accelerations. It is the product of force applied through a displacement: no displacement -- no work! du = f dr. F = f cos t: si: newton-meter or 1 joules =1 n-m, fps: pounds force - feet (lbf-ft, caution: potential confusion with units (force*distance) Work is a scalar (from a dot product => f dr) Moments are vectors (formed from cross product=> rxf) From the alternate kinematic formulation developed earlier sb sa a t ds vb va v dv.
