ʵʵСһ ͬ
3Сڹϼ¼ʾĹ·ͼOEΪˮеߣͨ·ΪˮֽʶԹƫǿ
4ͬǷֱӲˮбУ ߸Զ뷨ߡ 21Сø֪ʶ˿ġơ乹ͼʾˮƽ֧ܵ˹̶̶̣֧ܺ˸̶֣һԵϸ֣ϸߵһҳ̣һװϸɳԲθͲͲزƣߵʵλù̶һͷΪָ룬ѸͲװˮˮУʱѴָ̺½ͲֹͿָͨڿ̶ϵλ÷ӳ
ش⣨ϸߡָ̡Լ뻬ֵĦ
1ΪΪ1kgĸƣ1kg룬ոͲڼϸɳͲ ѡϡ¡պˮƽ־ֹʱڿ̶Ͻָָλñ궨Ϊ̶ߡ
2ȡ룬Ͳܵ һƽʱͲֱظˮϾֹ˿̶ָλӦ궨Ϊ̶ߣھȵر궨̶ߡ
3Ϊmm1kgĴڳϣͲֹʱ±ˮľhϸɳMͲĺSˮܶΪˮıʽm= 4ԭĸͲΪͬСһͲϸɳϸߵijȵȲ䣬±궨Ŀ̶ԭ̶ȷ仯 ѡ̶̶½һ仯ԭǣ ۺӦ⣺2С⣬226֣238֣14
22ͼʾ·ԴѹΪ8VСݱС6V 3W¶ȶԵݵӰ죬պϿS 1СݵĶ
2СʱR·ֵ
3ƶĻƬѹʾΪ3VʱСݵʵʹʡ
5
23ϣСͬλͬν߳бϷɳĽǶԽ˶Խߣ˶ԽԶʲôԭأ
Сʦ̣ʦ˵dz˶һٶбϷ߳˶б˶˶켣ͼʾʼ˶ˮƽļнǽǣ׳㵽صˮƽ̣׳ٶȺǵĴСйء ƿش⣺
10.4kgܵǶ٣ȡg=10N/kg
2ӵ߳ʱеĶ120Jܴ߳ﵽ߶5mߵʱеĶǶ٣
3X׳ٶvǦ֮㹫ʽX=ٶˮƽ45߳Ƕ٣ȡg=10N/kg
20m/s
430߳䶯Ekˮƽλs仯ϵͼͼʾͬλ60ǰδСͬٶ߳ڴͬһл˴Ķˮƽλñ仯ϵĴͼ
6
ο
һѡ⣺6С⣬ÿС3֣18֣ÿСĸѡУֻһǷĿҪģ
1Ϊ˷ֹѧУѧӰ죬ܲӦѡͼʾĸͨ־ưУ·θǡ
֪ʶ㡿;
˼·ѧѧϰӰ죬ѡķš
̡⣺AͼʾֹѣֹӰѧѧϰ⡣ Bͼʾ٣˶ٶȶѧѧϰûӰ죬⡣ CͼʾֹͣǷͣѧϰûӰ죬⡣ DͼʾأǷضѧϰûӰ죬⡣ ѡA
ܽɡһЩͨ־йϵٺصȡ
2ͨԿҵĴϸһСˮ飬¸ʱῴϽбйˮ顢ķȷǣ
AǾˮγ BǾڴһ CǾˮҺγ DǾڴһ ֪ʶ㡿ҺҺе
˼·ֱ̬ӱΪ̬Ĺ̽ȡ
̡⣺¶Ƚϸߣ¶ȽϵͣڲΧˮ¶ȵ͵IJҺγСˮΣ¸ʱڵˮIJγСḽڲڲ࣬DȷABC ѡD
ܽɡеҺһ⡣
3߰ʹòȫ֣ȷʹò߰ǣ Aڲ߰Ͽͬʱʹöõ B߰Էڼеκλ Cʹû߰ʱҪעؼ DõIJеĽƬȫӴ ֪ʶ㡿Ĺ빤ʽ
˼·ټͥ·иõ˴˲ͬʱõԽ࣬·Խ
7
ڼͥ·иԪҪáصѡλðװ ۼͥ·õܱƿؼҪһĹҪ
߽ܵͷҪι̣ͷеĽƬҪֽӴҪ֡Ӵ ̡⣺A߰嵼粿ֺ;ԵֶһĹҪͬʱʹöõͬʱ϶ջ߰壬ɶ·֡A B߰岻ҷţҪСŲҸὦˮĵطB
Cѡ֮߰ǰӦüƻݲ߰ҪصõʴСѡʼIJ߰塣Cȷ
Dõ߰ʱҪ֤еĽƬȫӴҪ֡ӴԱõD ѡC
ܽɡ˰ȫõ糣ʶҪ漰Dz߰ʹùǰȫõĻҪ 4ͼʾǵʾͼװͨҺѹŖeƶ۲ʹOתӶͨﻺ𡣼Ÿ˶Ե۵ʼ۴ֱͨתĹУзȷǣ
AŸ˶Ե۵ BԵ۵ CŸ˶Ե۵۲ DԵ۵۲ϼС ֪ʶ㡿ܸ˵Ӧã
˼·1ʾͼһͷ߶ΰĴСõҪرʾ߶εij̱ʾĴСͷʾķ߶յʾõ㡣 ָ֧㵽ߵľ룻
2ٶ۵ĹУۡ۵ı仯ݸܸƽF1L1=F2L2óı仯
̡⣺1Ÿ˶Ե۵֧õڵϣֱڵϣ֧õ㣬֧ķһ߶ΣFʾȻ֧O߶Σ߶LΪۣͼʾ
2ĹУ䣬ۼСԵ۵С۲䣬
8