For each situation below, consider whether total kinetic energy, total mechanica
ID: 1264808 • Letter: F
Question
For each situation below, consider whether total kinetic energy, total mechanical energy, and/or total energy (including all forms of energy) is conserved. Ignore air resistance unless otherwise stated. Do NOT ignore friction unless explicitly stated. Situation: A block sits at rest on a table and never moves. Total kinetic energy ____ conserved. Total mechanical energy ____ conserved. Total energy ____ conserved. Situation: A block slides across a frictionless horizontal surface. Total kinetic energy ____ conserved. Total mechanical energy ____ conserved. Total energy ____ conserved. Situation: A block slides across a horizontal table (friction cannot be ignored). Total kinetic energy ____ conserved. Total mechanical energy ___ conserved. Total energy _____ conserved. Situation: A block falls towards the ground. Total kinetic energy ____ conserved. Total mechanical energy ____ conserved. Total energy ____ conserved.Explanation / Answer
A) As block doesn't move ,
Total K.E. -> conserved is
Total M.E. - > conserved is
Total Energy -> conserved is
A) Total K.E. -> conserved is
Total M.E. - > conserved is
Total Energy -> conserved is
A) Total K.E. - > not conserved ( external force acting) is not
Total M.E. - > not conserved ( external force acting) is not
Total energy conserved as work done by friction will evolve as heat energy so summation of all energy will be conserved. may be
B) Total K.E. -> Increased as P.E. decreases ( Not conserved) is not
Total M.E. - > (Summation of P.E. +K.e. WILL BE same ) so conserved is
Total Energy -> conserved is
if we take air friction in picture then
Total K.E. -> is not
Total M.E. - > not
Total Energy -> may be
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