姝ｄ氦鍒嗚В娉?/p>
1
锛?/p>
渚?/p>
.
1
锛庡鍥?/p>
5
鎵�绀猴細涓変釜鍏辩偣鍔涳紝
F
1
=5N
锛?/p>
F
2
=10N
锛?/p>
F
3
=15N
锛?
胃
=60
掳锛屽畠浠殑鍚堝姏鐨?/p>
x
杞存柟鍚戠殑鍒嗛噺
F
x
涓?/p>
________N
锛?/p>
y
杞存柟鍚戠殑鍒嗛噺
F
y
涓?/p>
N
锛屽悎鍔涚殑
澶у皬涓?/p>
N
锛屽悎鍔涙柟鍚戜笌
x
杞存鏂瑰悜澶硅
涓?/p>
銆?/p>
12. (8
鍒?/p>
)
濡傚浘
6
鎵�绀猴紝
胃
锛?/p>
37
0
锛?/p>
sin37
0
锛?/p>
0.6
锛?/p>
cos37
0
锛?/p>
0.8
銆?
绠卞瓙閲?/p>
G
锛?/p>
200N
锛岀瀛愪笌鍦伴潰鐨勫姩鎽╂摝鍥犳暟
渭
锛?/p>
0.30
銆傝鍖�閫熸媺鍔ㄧ瀛愶紝鎷夊姏
F
涓哄澶э紵
2
濡傚浘鎵�绀猴紝
璐ㄩ噺涓?/p>
m
鐨勭墿浣撳湪鍊捐涓?/p>
胃
鐨勭矖绯欐枩闈笅鍖�
閫熶笅婊戯紝姹傜墿浣撲笌鏂滈潰闂寸殑婊戝姩鎽╂摝鍥犳暟銆?/p>
3
锛?/p>
锛?/p>
6
鍒嗭級濡傚浘
10
鎵�绀猴紝鍦ㄥ�捐涓?/p>
伪
=37
掳鐨勬枩闈笂鏈?/p>
涓�鍧楃珫鐩存斁缃殑妗ｆ澘锛屽湪妗ｆ澘鍜屾枩闈箣闂存斁涓�涓噸鍔?/p>
G=20N
鐨勫厜婊戠悆锛?/p>
鎶婄悆鐨勯噸鍔涙部鍨傜洿浜庢枩闈㈠拰鍨傜洿浜庢。
鏉跨殑鏂瑰悜鍒嗚В涓哄姏
F
1
鍜?/p>
F
2
锛?/p>
姹傝繖涓や釜鍒嗗姏
F
1
鍜?/p>
F
2
鐨勫ぇ
灏忋�?/p>
4.
璐ㄩ噺涓?/p>
m
鐨勭墿浣撳湪鎭掑姏
F
浣滅敤涓嬶紝
F
涓庢按骞虫柟鍚戜箣闂?/p>
鐨勫す瑙掍负
胃
,
娌垮ぉ鑺辨澘鍚戝彸鍋氬寑閫熻繍鍔紝
鐗╀綋涓庨《鏉块棿鍔?/p>
鎽╂摝鍥犳暟涓?/p>
渭
锛屽垯鐗╀綋鍙楁懇鎿﹀姏澶у皬涓哄灏戯紵
:
5
濡傚浘鎵�绀猴紝鐗╀綋鐨勮川閲?/p>
kg
m
4
.
4
飥?/p>
锛岀敤涓庣珫鐩存柟鍚戞垚
飩?/p>
飥?/p>
37
飦?/p>
鐨勬枩鍚戝彸涓婃柟鐨勬帹鍔?/p>
F
鎶婅鐗?/p>
浣撳帇鍦ㄧ珫鐩村澹佷笂锛屽苟浣垮畠娌垮澹佸湪绔栫洿鏂瑰悜涓婂仛鍖�閫熺洿绾胯繍鍔ㄣ�傜墿浣撲笌澧欏闂寸殑鍔ㄦ懇鎿﹀洜
鏁?/p>
5
.
0
飥?/p>
飦?/p>
锛屽彇閲嶅姏鍔犻�熷害
2
/
10
s
m
g
飥?/p>
锛屾眰鎺ㄥ姏
F
鐨勫ぇ灏忋�?/p>
锛?/p>
6
.
0
37
sin
飥?/p>
飩?/p>
锛?
8
.
0
37
cos
飥?/p>
飩?/p>
锛?/p>
6
濡傚浘鎵�绀猴紝閲嶅姏涓?/p>
500N
鐨勪汉閫氳繃璺ㄨ繃瀹氭粦杞殑杞荤怀鐗靛紩閲?/p>
200N
鐨勭墿浣擄紝
褰撶怀涓庢按骞抽潰鎴?/p>
60
o
瑙掓椂锛岀墿浣撻潤姝紝涓嶈婊戣疆涓庣怀鐨勬懇鎿︼紝姹傚湴闈㈠浜虹殑鏀?/p>
鎸佸姏鍜屾懇鎿﹀姏銆?/p>
姝ｄ氦鍒嗚В娉?/p>
2
锛?/p>
1
濡傚浘鎵�绀猴紝涓�涓汉鐢ㄤ笌姘村钩鏂瑰悜鎴?/p>
=
瑙掔殑鏂滃悜涓嬬殑鎺ㄥ姏
F
鎺ㄤ竴涓川閲忎负
20 kg
鐨勭瀛?
鍖�閫熷墠杩涳紝濡傚浘锛?/p>
a
锛夋墍绀猴紝绠卞瓙涓庢按骞冲湴闈㈤棿鐨勫姩鎽╂摝鍥犳暟涓?
锛?/p>
0.40
锛庢眰锛?/p>
锛?/p>
1
锛夋帹鍔?/p>
F
鐨勫ぇ灏忥紱
锛?/p>
2
锛夎嫢璇ヤ汉涓嶆敼鍙樺姏
F
鐨勫ぇ灏忥紝鍙妸鍔涚殑鏂瑰悜鍙樹负涓庢按骞虫柟鍚戞垚
瑙?
鏂滃悜涓婂幓鎷夎繖涓潤姝㈢殑绠卞瓙锛屽鍥撅紙
b
锛夋墍绀猴紝鎷夊姏浣滅敤
2.0 s
鍚庢挙鍘伙紝绠卞瓙鏈�澶氳繕鑳借繍鍔?/p>
澶氶暱璺濈锛燂紙
g
鍙?/p>
10
锛?/p>
銆?/p>
锛?/p>
F=120 N
=2.88 m
锛?/p>
2
锛庡湴闈笂鏀句竴鏈ㄧ锛岃川閲忎负
40kg
锛岀敤
100N
鐨勫姏涓庢按骞虫垚
37
掳瑙?/p>
鎺ㄦ湪绠憋紝濡傚浘
5
鎵�绀猴紝鎭板ソ浣挎湪绠卞寑閫熷墠杩涳紟鑻ョ敤姝ゅ姏涓庢按骞虫垚
37
掳瑙掑悜鏂滀笂鏂规媺鏈ㄧ锛屾湪绠辩殑鍔犻�熷害澶氬ぇ锛燂紙鍙?/p>
g=10m
锛?/p>
s
2
锛?/p>
sin37
掳
=0.6
锛?/p>
cos37
掳
=0.8
锛?/p>
3
濡傚浘鎵�绀猴紝璐ㄩ噺涓?/p>
0. 5 kg
鐨勭墿浣撳湪涓庢按骞抽潰鎴?
瑙掔殑鎷夊姏
F
飦?
60