. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ht beapplied to a piece of steel without givingit a permanent set, i. e., carrying it be-yond the point (the elastic limit) fromwhich it would begin to fail to return toits original shape upon removing thestress, would permanently deform apiece of lead or a piece of rubber which,contrary to the popular conception, is oflow elasticity. Rubber is elastic in thepopular sense that a very small force willstretch or elongate it a great deal, but itis inelastic in a mechanical sense that a Inelashc
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ht beapplied to a piece of steel without givingit a permanent set, i. e., carrying it be-yond the point (the elastic limit) fromwhich it would begin to fail to return toits original shape upon removing thestress, would permanently deform apiece of lead or a piece of rubber which,contrary to the popular conception, is oflow elasticity. Rubber is elastic in thepopular sense that a very small force willstretch or elongate it a great deal, but itis inelastic in a mechanical sense that a Inelashc Impact eu basis 4e. €• coefficient of rasttution - O. KM \A /^ /! ° in v< uy ;^ r ^ y ^. Impact ■ % of tjM. rr)\ M. = fjiss . vzlocity of leacTin^ objectm, AA. W if m 10 fv overtaire mF^ = forc£ of impact - tbst^ ~ time of impact • sec. =■ j^ ace, aiaumect for ^-juC = / mph - assumect _lf tMj objects of unequal mass are tnifoli/ed , finct impact tiue io-fifo objects of one of lai^er an^ apply correction f*tctoroii/en by upper t Z 3 4- ffDr Inpxf - lbs. - ^ DI.\GRAM SHOWING FORCE OF pact with the same velocity, i. e., zerovelocity difference. But the velocity dif-ference after impact will be greater asthe coefficient of restitution approachesunity. In other words, the greater tlieelasticity the greater its recoil or kickback, and therefore the greater accumu-lative velocity difference between suc-ceeding cars and, correspondingly, thegreater will be each collision as the slackaction passes on through the train. In this connection it is impossible todissociate the two phases of elasticity—the one involving restitution of form andenergy and the other involving themodulus of elasticity, or unit stress(force per unit area) per unit elongationwithin the elastic limits. Every sub- IMP.\CT BETWEEN TWO CARS. comparatively small stress will take itbeyond the elastic limit and break it. As the elasticity of a substance isgreater, the elongatio
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