第四章 机械能和能源（学案二）-2020年高中同步教与学物理（粤教版必修2）

书书书 !"# ! $%&'&( !"# ! $ %&'$()* !! !"#$%& " "#$#$% ! ! '()& " "# " $#$% ! # " " ##$% ! # $! *!+,-.-/012345+,12/06- .1234 ! &! !789 ! :;<=36 ! ><=?@ABCDE"FG ! *<!HDEIJ ! =!HDEKL ! M'N=!OP& $ QRS TUV-W! % ! '! X#$%YEZ[-W!\] ! C,^_"`- ! a<b c`d"- ! ef"f- #"%& ! 'ghi-jk[- ! 5RSl Dmn-Y;/0`do ! mn-+p&[- ! 12 $ gqrs t( ! (! !"#$%u12 $ &RSCv"12 ! +," ! -&($./0&$()* ! 1 ! " ! awxyB ! z9& ' "RS{|}~�& ! "� �� ! RS.���"Dmn��& " ! H��0��h��2 D�� ( ! Z & " ! # mn-CRSW"! ' " & # ��CRS"f-W"! ' " ' # ��CRSW"! ! 23 ! !" ' #$%&'()*+, ! !"-.% ' ) " / 012% # ) " /03!"#45% # * 67)89 ! # ) "' ) #$% ! ! # ) :;< ( =>#?@A # +,-. ! $! # * "' ) %/0 ! ! # * :;< ( =>#?@A ! ! !! # ! $ " # * "# * (#$% ! "' ) (%/0 ! #$% ! ! # & $ " # ) "# ) (#$% # +,-. ! $ "1' ) (%/0 ! #$% ! ! # ' $ /03!"B#CA45%B#CD12%B#C= D !"" " *. " ) ",! EFGHIJK ! /03!"#12%D 45%#L%:.%MNOP ! :;<QPRS ! TL%UBC ! 45 ! " ! # ' ) (%/0 ! #$% !! " & # 1' ) (%/0 ! #$% !! " ' # , !"#$ KVWXYZ[\0JK]^#_` ! a"A % # ! $ U6$%&' ! bcdeA/0f%UBC ! 45%Bg C ! # & $ Uhijklm%:;<QP#?@nopqrst ! # ' $ UJK/03!"BC#uv ! nsw # ) " # * L%B# CxyAz{%B#C ! +,6 ! 789:;<=&($ ! 1 " " ! ���N�& &2!, ' 3 4 "�R�v������ � !56 "v/ ! �Z}�w����u�����C�RyW "! ( �RTU�-W"! ( � -W"! ! " ) "!,6 ) % & # " ! # ���� ' " & # �J�¡ *"&6 ) % & �J�v0��� ! 23 ! # ! $ |}~�W ! �%:.%�M ! � # ! "' ) ! �� 3.!B#C " ! "# ! +"&2!, ' 2!,2!57"'!82!, 9 7! .%BC " : "1' ) +"1'!82!, 9 7 ! �!��.%B# C " � "'!82!, 9 7! L�%B#C " L " " ! ." : ",! # & $ |�}~�W ! �����l�� % # & 1' ) "'* ! ��% # & "' # ) .* $! ���3.!B#C " & "# & +"' # ) .* $ +"&2!, ' 2 # !,.& $ 2!57"(!'&2!, 9 7! .%BC " �!��.%B#C � # ! $ ! L�%B#C " L " " & ." : ";!&2!, ( 7! ��_` " L EF7 " L "# L + �� ! 45 ! " ! # " ! "'!82!, 9 7 ! " T "'!82!, 9 7 ! " � ", " & # " & "(!'&2!, 9 7 ! " T "'!82!, 9 7 ! " � ";!&2!, ( 7! %&'( -��U�_`) ! �.�3.!�%U� ! ��; <�� ! BC�U� ! �CW���& ¡%BC:L%B#C ! +,> ! ?@AB(CDE # FGH&($ ! 1 # " ! z9& , "¢£¤¥}¦§"�h�� ! a�x yB ! ¨z9& ' "§© ! �Q¨�¡ - ª¢£¤"A�� . « §� / « ! }£¤�¬­® ( ! }¯°ru¢£¤¬­® $ ! ±§ ©.£¤�Dmn��& " ! ²£¤C§