1、 - 1 - 07 10 5 50 5 3 0 1 3Q Q r F r/3 A F/3 B F C 3F D 9F 2 O a b c d A a B c C b D d 3 A B A B EA EB A B EpA EpB A EA EB B EAEpB 4 m 9q q A B r k A 3q k mgB 9q 2 k mgC 2r D 3r 5 M N A B O AB C D AB C P P C D A P C CD B P CO CD C P C M N CD D P CO M N C D - 2 - 6 a b c d ab cd ab cd a 3 V b 5 V
2、 c 7 V d A 1 V B 2 V C 3 V D 4 V 7 P E U W P A U E B E W C U W D U W 8 OO A 3 B 1 C 3 D 1 9 q m v0 A B C v0/g D g 10 m q Ox O E Ox v0 x0 Ox f fEpB D 4 A k 9q 2 x 2 mg x 3q k mg 5 BD P C CD A P CO D B M N C P CO - 5 - M N P C O P O D D C D 6 C cd e ab ce Uba Uce 5 V 3 V 2 V de ce Uce Ued 2 V d 3 V
3、7 AC E Q S U Ed P W q P qE dP 8 CD 1 1H 2 1H 4 2He y 1 2 qU2L 2 dmv 2 0 qU2L 2 4dEk qmU2L 2 2dp 2 U2L 2 4dU1 C D 9 C A B g t v0/g C g a g D 10 A fqE qEx0 fx 0 1 2 mv0 x A 11 6 A x v 2 0 2ax v 2 0 4g vx vx v0 2gt vy vy gt v v 2 x v 2 y v0 2vy 2 v 2 y vy 2 5 v0 2 v 2 0 5 vy 2 5 v0 5 5 v0 v 2 0 4g5v0 5
4、12 6 Ea Eb a b va vb a b 13 10 1 D AD AB D B UDB D B 0 mg L 2 sin30 1 2 mv 2 D 0 vD gL 2 - 6 - 2 C N F sin30 mgcos30 F kq 2 Lcos30 2 N 3 2 mg 2kq 2 3L 2 N N 3 2 mg 2kq 2 3L 2 1 gL 2 2 3 2 mg 2kq 2 3L 214 13 1 W Eqh 100 10 12 0 8 J 8 10 11J 2 W Ek2 Ek1 Ek2 8 10 11J 2 10 15 200 2 /2 J 1 2 10 10J 3 r
5、 h 1 2 at 2 Eq 2m t 2 t 5 66 10 3s r v0t 1 13 m S r 2 4 0 m 2 1 8 10 11J 2 1 2 10 10J 3 4 0 m 215 14 1 2qE 4mg E 2mg q 2 4 v 4mg 5L 4 qE 2L 1 2 4mv 2 v 2gL 3 v1 1 3 4mg 2L qE L 2L 1 2 4mv 2 1 v1 gL - 7 - 2 3 t1 t1 3L v1 3 gL g 3 4 t2 t2 L v1 v 2 2L v1 v 2 gL 2 1 g 2 2 1 gL g 2 4 t t1 t2 2 2 1 gL g 1 2mg q 2 2gL 3 2 2 1 gL g
