闅剧偣涔嬩笁锛氬渾鍛ㄨ繍鍔ㄧ殑瀹炰緥鍒嗘瀽
涓�銆侀毦鐐瑰舰鎴愮殑鍘熷洜
1
銆佸鍚戝績鍔涘拰鍚戝績鍔犻�熷害鐨勫畾涔夋妸鎻′笉鐗㈠浐锛岃В棰樻椂涓嶈兘鐏垫椿鐨勫簲鐢ㄣ�?/p>
2
銆佸渾鍛ㄨ繍鍔ㄧ嚎閫熷害涓庤閫熷害鐨勫叧绯诲強閫熷害鐨勫悎鎴愪笌鍒嗚В鐨勭患鍚堢煡璇嗗簲鐢ㄤ笉鐔熺粌锛屽彧鏄簡瑙ｅぇ姒傦紝鍦ㄨВ
棰樿繃绋嬩腑涓嶈兘鐏垫椿搴旂敤锛?/p>
3
銆佸渾鍛ㄨ繍鍔ㄦ湁涓�浜涜姹傛�濈淮闀垮害杈冮暱鐨勯鐩紝鍙楀姏鍒嗘瀽涓嶆寜鐓т竴瀹氱殑姝ラ锛屾紡鎺夐噸鍔涙垨鍏跺畠鍔涳紝鍥犱负
涓�鐐瑰皬澶辫锛屽鑷村叏鐩樼殕閿欍�?/p>
4
銆佸渾鍛ㄨ繍鍔ㄧ殑鍛ㄦ湡鎬ф妸鎻′笉鍑嗐�?/p>
5
銆佺己灏戠敓娲荤粡楠岋紝缂哄皯浠旂粏瑙傚療浜嬬墿鐨勭粡鍘嗭紝寰堝瀹炰緥鐭ラ亾澶ф鍗翠笉鑳界悊瑙ｆ湰璐紝鏇翠笉鑳芥妸鐗╃悊鐭ヨ瘑
涓庣敓娲诲疄渚嬪緢濂界殑鑱旂郴璧锋潵銆?/p>
浜屻�侀毦鐐圭獊鐮?/p>
锛?/p>
1
锛夊寑閫熷渾鍛ㄨ繍鍔ㄤ笌闈炲寑閫熷渾鍛ㄨ繍鍔?/p>
a.
鍦嗗懆杩愬姩鏄彉閫熻繍鍔紝鍥犱负鐗╀綋鐨勮繍鍔ㄦ柟鍚戯紙鍗抽�熷害鏂瑰悜锛夊湪涓嶆柇鍙樺寲銆傚渾鍛ㄨ繍鍔ㄤ篃涓嶅彲鑳芥槸鍖�鍙?/p>
閫熻繍鍔紝鍥犱负鍗充娇鏄寑閫熷渾鍛ㄨ繍鍔紝鍏跺姞閫熷害鏂瑰悜涔熸槸鏃跺埢鍙樺寲鐨勩�?/p>
b.
鏈�甯歌鐨勫渾鍛ㄨ繍鍔ㄦ湁锛氣憼澶╀綋锛堝寘鎷汉閫犲ぉ浣擄級鍦ㄤ竾鏈夊紩鍔涗綔鐢ㄤ笅鐨勮繍鍔紱鈶℃牳澶栫數瀛愬湪搴撲粦鍔涗綔
鐢ㄤ笅缁曞師瀛愭牳鐨勮繍鍔紱
鈶㈠甫鐢电矑瀛愬湪鍨傜洿鍖�寮虹鍦虹殑骞抽潰閲屽湪纾佸満鍔涗綔鐢ㄤ笅鐨勮繍鍔紱
鈶ｇ墿浣撳湪鍚勭澶栧姏
锛堥噸
鍔涖�佸脊鍔涖�佹懇鎿﹀姏銆佺數鍦哄姏銆佺鍦哄姏绛夛級浣滅敤涓嬬殑鍦嗗懆杩愬姩銆?/p>
c.
鍖�閫熷渾鍛ㄨ繍鍔ㄥ彧鏄�熷害鏂瑰悜鏀瑰彉锛岃�岄�熷害澶у皬涓嶅彉銆傚仛鍖�閫熷渾鍛ㄨ繍鍔ㄧ殑鐗╀綋锛屽畠鎵�鍙楃殑鎵�鏈夊姏鐨勫悎
鍔涙彁渚涘悜蹇冨姏锛屽叾鏂瑰悜涓�瀹氭寚鍚戝渾蹇冦�傞潪鍖�閫熷渾鍛ㄨ繍鍔ㄧ殑鐗╀綋鎵�鍙楃殑鍚堝鍔涙部鐫�鍗婂緞鎸囧悜鍦嗗績鐨勫垎鍔涳紝鎻?/p>
渚涘悜蹇冨姏锛屼骇鐢熷悜蹇冨姞閫熷害锛涘悎澶栧姏娌垮垏绾挎柟鍚戠殑鍒嗗姏锛屼骇鐢熷垏鍚戝姞閫熷害锛屽叾鏁堟灉鏄敼鍙橀�熷害鐨勫ぇ灏忋�?/p>
渚?/p>
1
锛?/p>
濡傚浘
3-1
鎵�绀猴紝
涓ゆ牴杞荤怀鍚岀郴涓�涓川閲?/p>
m=0.1kg
鐨勫皬鐞冿紝
涓ょ怀鐨勫彟涓�绔垎鍒浐瀹氬湪杞翠笂鐨?/p>
A
銆?/p>
B
涓ゅ锛?/p>
涓婇潰缁?/p>
AC
闀?/p>
L=2m
锛屽綋涓ょ怀閮芥媺鐩存椂锛屼笌杞寸殑澶硅鍒嗗埆涓?/p>
30
掳鍜?/p>
45
掳锛?/p>
姹傚綋灏忕悆闅忚酱涓�璧峰湪姘村钩闈㈠唴鍋氬寑
閫熷渾鍛ㄨ繍鍔ㄨ閫熷害涓?/p>
蠅
=4rad/s
鏃讹紝涓婁笅涓よ交缁虫媺鍔涘悇涓哄灏戯紵
銆?/p>
瀹￠
銆戜袱缁冲紶绱ф椂锛屽皬鐞冨彈鐨勫姏鐢?/p>
0
閫愭笎澧炲ぇ鏃讹紝
蠅
鍙兘鍑虹幇涓や釜涓寸晫鍊笺�?/p>
銆?/p>
瑙ｆ瀽
銆戝鍥?/p>
3-1
鎵�绀猴紝褰?/p>
BC
鍒氬ソ琚媺鐩达紝浣嗗叾鎷夊姏
T
2
鎭颁负闆讹紝璁炬鏃惰閫熷害涓?/p>
蠅
1
锛?/p>
AC
缁充笂鎷夊姏璁?/p>
涓?/p>
T
1
锛屽灏忕悆鏈夛細
mg
T
飥?/p>
飩?/p>
30
cos
1
鈶?/p>
飦?/p>
飦?/p>
30
sin
L
蠅
m
=
30
sin
T
A
B
2
1
1
鈶?/p>
浠ｅ叆鏁版嵁寰楋細
s
rad
/
4
.
2
1
飥?/p>
飦?/p>
锛?/p>
瑕佷娇
BC
缁虫湁鎷夊姏锛屽簲鏈?/p>
蠅
>
蠅
1
锛屽綋
AC
缁虫伆琚媺鐩达紝浣嗗叾鎷夊姏
T
1
鎭颁负闆讹紝璁炬
鏃惰閫熷害涓?/p>
蠅
2
锛?/p>
BC
缁虫媺鍔涗负
T
2
锛屽垯鏈?/p>
mg
T
飥?/p>
飩?/p>
45
cos
2
鈶?/p>
T
2
sin45
掳
=m
2
2
蠅
L
AC
sin30
掳鈶?/p>
浠ｅ叆鏁版嵁寰楋細
蠅
2
=3.16rad/s
銆傝浣?/p>
AC
缁虫湁鎷夊姏锛屽繀椤?/p>
蠅
<
蠅
2
锛屼緷棰樻剰
蠅
=4rad/s>
蠅
2
锛屾晠
AC
缁冲凡鏃犳媺
鍔涳紝
AC
缁虫槸鏉鹃┌鐘舵�侊紝
BC
缁充笌鏉嗙殑澶硅
胃
>45
掳锛屽灏忕悆鏈夛細
mg
T
飥?/p>
飦?/p>
cos
2
T
2
cos
胃
=m
蠅
2
L
BC
sin
胃
鈶?/p>
鑰?/p>
L
AC
sin30
掳
=L
BC
sin45
掳
鍥?/p>
3-1