Conservation of Mechanical Energy • Consider a single conservative force doing work on a closed system • ∵W_F=ΔK, W_F=−ΔU • ∴ΔK+ΔU=0 • ∴K_i+U_i=K_f+U_f Non-Conservative Forces • Non-conservative forces change the total mechanical energy of a system, but not the total energy of a system • Work done by a non-conservative force is typically converted to internal (thermal) energy • E_total=K+U+W_NC • E_mecℎ=K+U 2002 Free Response Question 3 2007 Free Response Question 3 2010 Free Response Question 1 2013 Free Response Question 1
