绗?/p>
1
椤碉紝鍏?/p>
39
椤?/p>
楂樹腑鐗╃悊鏄撻敊棰樺綊绾虫�荤粨鍙婄瓟妗堝垎鏋?/p>
锛戯紟濡傚浘鎵�绀猴紝涓�寮圭哀绉ゆ斁鍦ㄥ厜婊戞按骞抽潰涓婏紝澶栧３璐ㄩ噺涓?/p>
m
锛屽脊绨у強鎸傞挬鐨勮川閲忎笉璁★紝鏂戒互
姘村钩鍔?/p>
F
1
銆?/p>
F
2
锛庡鏋滃脊绨хГ闈欐涓嶅姩锛屽垯寮圭哀绉ょ殑
绀烘暟搴斾负
锛庡鏋滄鏃跺脊绨хГ娌?/p>
F
2
鏂瑰悜浜х敓浜?/p>
鍔犻�熷害
n
锛屽垯寮圭哀绉よ鏁颁负
锛?/p>
瑙ｆ瀽锛氶潤姝笉鍔紝璇存槑
F
l
锛?/p>
F
2
锛庝骇鐢熷姞閫熷害锛屽嵆
F
2
涓�
F
l
锛?/p>
ma
锛屾鏃朵綔鐢ㄥ湪鎸傞挬涓婄殑鍔?/p>
涓?/p>
F
l
锛屽洜姝ゅ脊绨хГ璇绘暟涓?/p>
F
1
锛?/p>
锛掞紟濡傚浘鎵�绀猴紝涓ゆ湪鍧楄川閲忓垎鍒负
m
l
銆?/p>
m
2
锛屼袱杞昏川寮圭哀鍔插害绯绘暟鍒嗗埆涓?/p>
k
l
銆?/p>
k
2
锛屼笂闈㈡湪鍧?/p>
鍘嬪湪涓婇潰鐨勫脊绨т笂
(
浣嗕笉鎷存帴
)
锛屾暣涓郴缁熷浜庡钩琛＄姸鎬侊紝鐜扮紦鎱㈠悜涓婃彁涓婇潰鐨勬湪鍧楋紝鐩村埌瀹?/p>
鍒氱寮�涓婇潰寮圭哀锛庡湪杩欒繃绋嬩腑涓嬮潰鏈ㄥ潡绉诲姩鐨勮窛绂讳负
锛?/p>
绛旀
:
2
1
k
g
m
.
3
锛?/p>
濡傚浘鎵�绀猴紝
鍦ㄥ�捐伪涓?/p>
60
掳鐨勬枩闈笂鏀句竴涓川閲忎负
l kg
鐨?/p>
鐗╀綋锛?/p>
鐢ㄥ姴搴︾郴鏁?/p>
100 N
锛?/p>
m
鐨勫脊绨у钩琛屼簬鏂滈潰鍚婁綇锛?/p>
姝ょ墿浣?/p>
鍦ㄦ枩闈笂鐨?/p>
P
銆?/p>
Q
涓ょ偣闂翠换浣曚綅缃兘鑳藉浜庨潤姝㈢姸鎬侊紝
鑻ョ墿浣?/p>
涓庢枩闈㈤棿鐨勬渶澶ч潤鎽╂摝鍔涗负
7 N
锛屽垯
P
銆?/p>
Q
闂殑闀垮害鏄澶?/p>
?
瑙ｆ瀽锛?/p>
PQ=Xp
涓�
Xq=[(mgsin
伪
+fm)
涓�
(mgsin
伪
-fm)]/k=0.14m
锛?/p>
4
锛庡鍥炬墍绀猴紝鐨甫骞抽潰鍙綋浣滄槸涓�涓笌姘村钩鏂瑰悜澶硅涓?/p>
a
鐨勬枩闈紝鐨甫瓒冲闀垮苟浣滈�嗘椂閽?/p>
鏂瑰悜鐨勫寑閫熻浆鍔紝
灏嗕竴璐ㄩ噺涓?/p>
m
鐨勫皬鐗╁潡杞昏交鏀惧湪鏂滈潰涓婂悗锛?/p>
鐗╁潡鍙楀埌鐨勬懇鎿﹀姏锛?/p>
l
J
(A)
涓�鐩存部鏂滈潰鍚戜笅锛?/p>
(B)
涓�鐩存部鏂滈潰鍚戜笂锛?/p>
(C)
鍙兘鍏堟部鏂滈潰鍚戜笅鍚庢部鏂滈潰鍚戜笂锛?/p>
(D)
鍙兘鍏堟部鏂滈潰鍚戜笅鍚庢潵鏃犳懇鎿﹀姏锛?/p>
绛旀锛?/p>
C
锛?/p>
5
锛?/p>
鏌愪汉鎺ㄧ潃鑷杞﹀墠杩涙椂锛?/p>
鍦伴潰瀵瑰墠杞殑鎽╂摝鍔涙柟鍚戝悜
锛?/p>
鍦伴潰瀵瑰悗杞殑鎽╂摝鍔涙柟鍚?/p>
鍚?/p>
锛涜浜洪獞鐫�鑷杞﹀墠杩涙椂锛屽湴闈㈠鍓嶈疆鐨勬懇鎿﹀姏鍚?/p>
锛屽鍚庤疆鐨勬懇鎿﹀姏
鍚?/p>
锛?/p>
(
濉?/p>
鈥?/p>
鍓?/p>
鈥?/p>
鎴?/p>
鈥?/p>
鍚?/p>
鈥?
绛旀锛氬悗锛屽悗锛涘悗锛屽墠锛?/p>
6
锛庡鍥炬墍绀猴紝閲?/p>
50
N
鐨勬枩闈綋
A
鏀惧湪鍔ㄦ懇鎿﹀洜鏁颁负
0.2
鐨勬按骞抽潰涓婏紝鏂滈潰涓婃斁鏈夐噸
10
N
鐨勭墿鍧?/p>
B
锛?/p>
鑻?/p>
A
銆?/p>
B
鍧囧浜庨潤姝㈢姸鎬侊紝
鏂滈潰鍊捐胃涓?/p>
30
掳
,
鍒?/p>
A
瀵?/p>
B
鐨?/p>
鎽╂摝鍔涗负
N
锛屾按骞抽潰瀵?/p>
A
鐨勬懇鎿﹀姏涓?/p>
N
7
锛?/p>
濡傚浘鎵�绀猴紝
A
銆?/p>
B
涓ょ墿浣撳潎閲?/p>
G=10N
锛?/p>
鍚勬帴瑙﹂潰闂殑鍔ㄦ懇鎿﹀洜
鏁板潎涓何?/p>
=0.3
锛屽悓鏃舵湁
F=1N
鐨?/p>
涓や釜姘村钩鍔涘垎鍒綔鐢ㄥ湪
A
鍜?/p>
B
涓婏紝鍒欏湴闈㈠
B
鐨勬懇鎿﹀姏绛変簬
锛?/p>
B
瀵?/p>
A
鐨勬懇鎿﹀姏绛変簬
瑙ｆ瀽锛氭暣浣撳彈鍔涘垎鏋愶紝濡傚浘
(a)
锛屾墍浠ュ湴闈㈠
B
娌℃湁鎽╂摝鍔涳紟瀵?/p>
A
鍙楀姏鍒嗘瀽锛屽鍥?/p>
(b)
锛?