鍔涘鍘嬭酱棰橈細
锛堜笢鍩庝竴妯★級
16
锛庡浘
10
鏄疄楠岀敤鐨勯敟褰㈢摱锛屽皢閿ュ舰鐡舵斁鍦ㄩ潰绉负
s
鐨勬按骞虫闈笂锛屽凡鐭ラ敟褰㈢摱鐨勮川閲忎负
m
1
銆佸簳闈㈢Н涓?/p>
s
1
锛涘綋寰�閿ュ舰
鐡朵腑鍊掑叆瀵嗗害涓?/p>
蟻
銆佽川閲忎负
m
2
鐨勬恫浣撳悗锛屾恫闈㈤珮搴︿负
h
锛屽垯
A
锛庨敟褰㈢摱涓殑娑蹭綋閲嶄负
蟻
g s
1
h
B
锛庢恫浣撳閿ュ舰鐡跺簳鐨勫帇寮轰负
蟻
gh
C
锛庣摱搴曞姘村钩妗岄潰鐨勫帇鍔涗负锛?/p>
m
1
锛?/p>
m
2
锛?/p>
g
D
锛庣摱搴曞姘村钩妗岄潰鐨勫帇寮轰负锛?/p>
m
1
锛?/p>
m
2
锛?/p>
g/ s
瑙ｏ細
A
銆佸洜閿ュ舰鐡惰秺寰�涓婃í鎴潰绉秺灏忥紝鎵�浠ラ敟褰㈢摱涓殑娑蹭綋閲嶄负
m
2
g
锛屽皬浜?/p>
蟻gs
1
h
锛屾晠
A
閫夐」涓嶆纭紱
B
銆佹牴鎹恫浣撶殑鍘嬪己鍏紡鍙煡娑蹭綋瀵归敟褰㈢摱搴曠殑鍘嬪己涓?/p>
蟻gh
锛屾晠
B
閫夐」姝ｇ‘锛?/p>
C
銆佸洜姘村钩闈笂鐗╀綋鐨勫帇鍔涘拰鑷韩鐨勯噸鍔涚浉绛夛紝鎵�浠ョ摱搴曞姘村钩妗岄潰鐨勫帇鍔涗负锛?/p>
m
1
+m
2
锛?/p>
g
锛屾晠
C
閫夐」姝ｇ‘锛?/p>
D
銆佺摱搴曞姘村钩妗岄潰鍘嬪己鐨勫彈鍔涢潰绉负
s
1
锛屾墍浠ュ妗岄潰鐨勫帇寮轰负
(
m
1
+
m
2
)
g
s
1
锛屾晠
D
閫夐」涓嶆纭紟
閫?/p>
BC
锛?/p>
锛堣タ鍩庝竴妯★級
锛?/p>
16
锛庡浘
5
涓畾婊戣疆閲?/p>
2N
锛屽姩婊戣疆閲?/p>
1N
銆傜墿浣?/p>
A
鍦ㄦ媺鍔?/p>
F
锛?/p>
4N
鐨勪綔鐢ㄤ笅锛?/p>
1s
鍐呮部绔栫洿鏂瑰悜鍖�閫熷崌楂樹簡
0.2m
銆備笉璁＄怀閲?
鍜岃酱鎽╂摝锛屽垯浠ヤ笅璁＄畻缁撴灉姝ｇ‘鐨勬槸
A
锛庣怀瀛愯嚜鐢辩绉诲姩閫熷害涓?/p>
0.4m/s
B
锛庢粦杞粍鐨勬満姊版晥鐜囦负
87.5%
C
锛庡ぉ鑺辨澘瀵规粦杞粍鐨勬媺鍔涗负
10N
D
锛庢粦杞粍瀵圭墿浣?/p>
A
鍋氬姛鐨勫姛鐜囦负
1.6W
瑙ｏ細
A
銆佺怀瀛愯嚜鐢辩绉诲姩鐨勮窛绂?/p>
s=2h=2
脳
0.2m=0.4m
锛岀怀瀛愯嚜鐢辩绉诲姩閫熷害
v=s t =0.4m 1s =0.4m/s
锛?/p>
鏁?/p>
A
姝ｇ‘锛?/p>
B
銆佺敱鍥剧煡锛屾壙鎷呯墿閲嶇殑缁冲瓙鑲℃暟
n=
锛屾媺鍔?/p>
F=1 2
锛?/p>
G
鐗?/p>
+G
鍔級
锛?/p>
G
鐗?/p>
=2F-G
鍔?/p>
=2
脳
4N-1N=7N
锛?/p>
鏈夌敤鍔?/p>
W
鏈?/p>
=G
鐗?/p>
h=7N
脳
0.2m=1.4J
锛?/p>
棰濆鍔?/p>
W
棰?/p>
=G
鍔?/p>
h=1N
脳
0.2m=0.2J
锛?/p>
W
鎬?/p>
=W
鏈?/p>
+W
棰?/p>
=1.4J+0.2J=1.6J
锛屾粦杞粍鐨勬満姊版晥鐜?/p>
畏
=W
鏈?/p>
W
鎬?/p>
脳
100%=1.4J 1.6J
脳
100%
鈮?/p>
87.5%
锛屾晠
B
姝ｇ‘锛?/p>
C
銆佹粦杞粍鏁翠綋鍙楀姏濡傚浘鎵�绀猴紝鐢卞钩琛℃潯浠跺緱锛氬ぉ鑺辨澘瀵规粦杞粍鐨勬媺鍔涗负
F
鎷?/p>
=G
鐗?/p>
+G
鍔?/p>
+G
瀹?/p>
+F=7N+1N+2N+4N=14N
锛屾晠
C
閿欒锛?/p>
D
銆佹粦杞粍瀵圭墿浣?/p>
A
鍋氬姛鐨勫姛鐜?/p>
P=W
鏈?/p>
t =1.4J 1s =1.4W
锛屾晠
D
閿欒锛?/p>
鏁呴�?/p>
AB
锛?/p>
锛堣タ鍩庝竴妯★級
锛?/p>
23
锛庡浘
8
涓殑鐗╀綋
A
鐨勮川閲忔槸
400g
锛岀墿浣?/p>
B
鐨勪綋绉槸
8cm
3
銆傜敤缁嗙怀灏嗕袱鐗╀綋閫氳繃瀹氭粦杞繛鎺ワ紝鏀炬墜鍚庯紝
A
鎭拌兘娌跨潃姘?
骞虫闈㈠悜鍙冲仛鍖�閫熺洿绾胯繍鍔ㄣ�?/p>
鑻ュ皢
B
濮嬬粓娴告病鍦ㄦ按涓紝
骞朵娇
A
娌跨潃姘村钩妗岄潰鍚戝乏鍋氬寑閫熺洿绾胯繍鍔ㄦ椂锛?/p>
闇�瑕佹柦鍔?/p>
1.12N
姘村钩鍚戝乏鐨勬媺鍔涖�傚垯鐗╀綋
B
鐨勫瘑搴︿负
_______ g/cm
3
銆?/p>
锛?/p>
g
鍙?/p>
10N/kg
锛?/p>
瑙ｏ細褰撶墿浣?/p>
A
姘村钩鍚戝彸鍖�閫熻繍鍔ㄦ椂锛屽垎鍒
A
銆?/p>
B
鐗╀綋鍙楀姏鍒嗘瀽濡備笅鍥炬墍绀猴細
鍒欐牴鎹姏鐨勫钩琛℃潯浠跺彲寰楋細
f=F1
锛?/p>
GB=F1
锛?/p>
鈭?/p>
G=mg
锛?/p>
m=
蟻
V
锛?/p>
鍥?/p>
10