A0261TROLLEYDYNAMIC(1WITHSPRING,1WITHOUTSPRING)Thisinstrumentisdesignforinvestigatingmomentum,velocity,acceleration,etc.Thetrolleyconsistsofarectangularhard-woodbodycarrieduponthreelow-frictionplasticwheels.Thissetsuppliedinpair,withonestrongspringplungerandtheotherwithoutspring.Thetrolleysstackedontopofeachotherandareheldinpositionbyholesintheuppersurfaceofthelowertrolley.Thisenablestheeffectivemassofatrolleytobeincreasestotwiceorthreetimesitsbasicmass.Inthefrontendofthetrolleyhasapairof magictape maybemadetosticktogetherforinelasticcollisions.Trolleydimension:300mmlength 140mmthick