1、 ( ) ( 2 40 ) 1 (2014 ) O G F F( ) A B C D 2 v 2015 ( )( ) A B C D 1 2 3 4 5 3 (2014 ) A B ( ) A B C D 4 (2014 ) F 20 N 40 N F 40 J ( ) A 40 J B 20 N C 2 m D 4 m 5 (2014 ) A B C AB=BC AB W 1 P 1 BC W 2 P 2 ( ) A W 1 2P 1 2B W 1 =W 2P 1 =P 2C W 1 =W 2P 1 P 2D W 1 =W 2P 1 P 2 6 5 ( ) A B C D 7 ( ) A B
2、 C D 8 F 1 F 2 F 3 ( ) A F 1 F 2 F 3B F 1 F 1 F 3D F 2 W F F 2 32 21 (2015 ) ( 50cm) O A 20N FA O 40cm B ( F 1 F 2 F 3 F 4 N ( ) 21 22 23 24 22 (2015 ) (1) (2) 23 (2015 ) (1) (2) 5N 2m 1m J 24 (2014 ) OA 20 cm G 1 5 cm G 2 20 N OC 10 cm _N G 1 2 10 4Pa G 2 _cm/s 12.5 s G 1 0 25 F 1 ab F 2 bc h(h ab
3、bc) F 1 _F 2 F 1 W 1 _F 2 W 2 ( 26 (2014 ) ( 0 ) h F F-h N h=15cm J 27 1 kg 30 cm _J _( “ ”“ ” “ ”) 28 50 N F 2 s 2 m ( ) F _N F W _J 2 10 29 (2015 ) A B (1) _ (2) N 30 (2015 ) O( ) 5N ( ) (1) _ (2) O F F _ (3) A B C 6 18 31 (2015 ) ( 10kg) ( g 10N/kg) (1) ( (2) 85kg (3) 6 0.5m 100 10% ( 1g 37.5kJ )
4、 32 F h 1 (1) (2) (3) 33 (2015 ) A 5kg 3kg 30cm (1) (2) 2 40 1 2 3 4 5 6 7 8 9 10 A D C C D C B D C C 11 12 13 14 15 16 17 18 19 20 D B D A B A B D C A 32 (1) h=48m t 60s v=s/t=48m/60s=0.8m/s (2) 0-4m W 1 =F 1 h 1 =2.5 10 4 N 4m=1.0 10 5 J 4-44m W 2 =F 2 h 2 =2.0 10 4 N 40m=8.0 10 5 J 44-48m W 3 =F 3 h 3 =1.5 10 4 N 4m=0.6 10 5 J W=W 1 +W 2 +W 3 =1.0 10 5 J+8.0 10 5 J+0.6 10 5 J=9.6 10 5 J (3) P=W/t=9.6 10 5 J/60S=1.6 10 4 W (1) 0.8m/s (2) 9.6 10 5 J (3) 1.6 10 4 W
