河北省邢台市高中物理 第一章 静电场 1.4 电势能和电势课件1 新人教版选修3-1

1、1.4 电势能和电势电势能和电势 F F coslFW + E qq l l AMFW +A+M E +A + E B M cosABFW 21 WWW +A + M E B AMFWAMFW E A CB D gE A B A B gE A B A B PBPAAB EEW PBPAAB EEW E AB gE A B A PBPAAB EEW AOPA mghE AO h O ABPA WE E A B + q q AB + JWAB 4 106 PBPAAB EEW 1 JEPA 4 1 106 PCPAAC EEW 2 JWAC 4 10)6(9 JEPA 4 2 103 A BC +

2、 + + BC E A l O cos 1 lqEEPA cos 1 lE q EPA cos2 2 lqEEPA cos 2 1 lE q EPA q EPA A A B BA + A B BA q EPA A A E B BC V C J q EPA A 15 104 106 9 8 1 1 JVCqE APA 910 22 10315102 AB C V A 5V C 20 B N M P J 4 100 . 6 J 3 100 . 1 PMN BA EEA. PBPA EEC. BA EEB. PBPA EED. AD C ab 0 O PAPOOA EEW PAPA EW q W q

3、 E OAPA A V C J 20 102 104 6 5 AB C + E PBPAAB EEW PBPA EE 0 AB W A B a b c K L M N AC A B D C A B D C 9 CDAB/ CDBA V D 9 A B BAAB U ABBA U BAAB UU VU AB 6 0 BAAB U A B C V10 V6 V2 VVVU CBBC 12)2(10 VVVU ACCA 12102 01010VVU BAAB PBPAAB EEWq BA )( PA E PB E q A q B qUW ABAB q W U AB AB AB q W U BA BA

4、 qUW BABA BCABAC UUU JWAB 5 103 V q W U AB AB 5 JWBC 5 102 . 1 V q W U BC BC 2 BCABAC UUU VVVU AC 3)2(5 gh3 A B C 2 2 1 mvWmgh AB ghv3 mghWAB 2 1 CB CABA UU CA AB BA U q W U q mgh U CA 2 A O C B E A O BE A o 30 B E C E 1 2 maTEq 1 EqqT)( 2 1 21 maTEq 2 E 1 2 gmmqEqE)3( A mamgEq mgqE2 gaA B mamgEq33

5、3 g aA h C B R v mqEmg B 2 A 2 2 1 )2()2( B mvRhqERhmg Rh 2 5 h C B A 2 2 1 C mvqEhmgh R v mmgEqN c 2 qEmgN66 h C B A R v mqEmg B 2 2 2 1 )2()2( B mvRhqERhmg Rh 2 5 q m O 0)sin(cosRREqmgR )sin1 ( cos q mg E q m O 2 2 1 mvEqRmgR sin1 cos2 3 mgT R v mmgT 2 q m O qE mg v qE mg v qE mg mg mg Eq 2 1 )sin1 ( cos mgqE 2 1 2 1 tan 5 5 sin 5 52 cos 2 2 1 )sin(cos m mvRRqEmgR? m v q m O qE mg E h A BC R mgF 4 5 D R v mF D 2 2 2 1 )sin2cot( 4 3 )cos( D mvRRhmgRRhmg mg mg 4 3 F Rh10 0 v m q h 2/h L t v L 2 0 g h g h t 2 2 h g Lv2 0 0 v m q h 2/h L 22 )( 2 1 2 1 g h m Eq atL hq