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Briefly explain how is a horse able to pull a cart |
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Answer» Solution :Considerthe horseas thesystemthen thereare thereforcesactingon thehorse. (i) Downwardgravitationalforce(m g) (ii) forceexertedby theroad (f) (iii)Backwardforceexertedby thecart (f )  `F_(r)`forceexertedby the roadon the horse `F_(c )` - forceexertedby teh cart on thehorse. `F_(e )` II-Parallelcomponentof `F_(r )`whichis REASONFOR forwardmovement. Letthe forceexertedby theroadcan beresolved intoparalleland perpendicularcomponents. thereis parallelcomponent . so thereis netthan thebackwardforcealongforwarddirctionwhichcausedtheforwardmovementof the horse. (i)Downwardgravitationalforce (ii)Forceexertedby theroad (iii) Forceexertedby teh horse  Theforceexertedby teh road`(vec(F )_(r))`can beresolovedintoparalleland perpendicualrcomponents . Theparallelcomponentactingin theopposibledirectionhencethereis an OVERALL unbalancedforcein theforwarddirectionthat causesthe carttoaccelerationforward. If wetakethe cartandhorseas asystemthenthereare twoforcesactingon thesystemthey are (i) Downwardsgravitationalforce (ii ) theforceexertedby theroad `(F_(r))`on THESYSTEM It isshown in the FOLLOWINGFIGURE.  (iii)In thiscase the forceexertedby the road`(F_(r))`on thesystemisresolvedintoparalleland perpendicularcomponents . TheThe perpendicular componenetis the normalforcewhichcancelsthedownward gravitionalfore `(m_(H)+ m_(c ))`g.Theparallelcomponentof the forceisnotbalancedhencethe systemaccelerationand movesforwarddue to thisforce. |
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