d next.obojolbo.uct.edu Obojebe Niext Decument Viewer Is Mechanical Energy Conse

Question

d next.obojolbo.uct.edu Obojebe Niext Decument Viewer Is Mechanical Energy Conserved? Select all the correct statements about the mechanical energy of the cases below (select all that are true). Situations for energy conservatiorn Case () : A block slides down a frictionless ramp, hits a second block on a frictionless surface, and sticks to it. Case (II) : A block sitting on a rough surface is compressed against a spring and then released. Case (III): A block is tied to a massless string and swings down from a certain height. Case (IV): A cannonball is launched by a cannon on the edge of a cliff, air resistance is negligible. 8

Explanation / Answer

NOTE - MECHANICAL ENERGY IS CONSERVED IF THERE ARE ONLY CONSERVATIVE FORCES ACTING ON THE SYSTEM.

iN CASE 1, THE MECHANICAL ENERGY IS CONSERVED AS THERE IS NO FRICTION SO THERE IS NO LOSS OF ENERGY JUST TRANSFER OF ENERGY

iN CASE 2, THE CONSERVATIVE SPRING FORCE FOR AN ISOLATED SYSTEM MAKES MECHANICAL ENERGY CONSERVED.

iN CASE 3, THE GRAVITY PLAYS A ROLE IN BRINGING DOWN THE MASS FROM A CERTAIN HEIGHT AS MECHANICAL ENERGY IS CONSERVED

iN CASE 4, IN CASE OF NO AIR RESISTANCE, THE ONLY FORCE ACTING IS GRAVITY (DOWNWARDS) SO ENERGY IS CONSERVED.

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