绗?/p>
7
璇炬椂
鐢ㄧ墰椤垮畾寰嬭В涓ょ被鍩烘湰闂
鈻?/p>
璇?/p>
鍓嶅熀纭�棰勪範
鐗涢】绗簩瀹氬緥鐨勬剰涔?/p>
鐗涢】绗簩瀹氬緥纭畾浜嗚繍鍔ㄥ拰鍔涚殑鍏崇郴锛屼娇鎴戜滑鑳藉鎶婄墿浣撶殑杩愬姩鎯呭喌涓庡彈鍔涙儏鍐佃仈绯昏捣鏉?/p>
.
涓ょ被鍔ㄥ姏瀛﹂棶棰?/p>
鈶犲凡鐭ョ墿浣撶殑鍙楀姏鎯呭喌锛屽垎鏋愮‘瀹氱墿浣撶殑鐨勮繍鍔ㄦ儏鍐?/p>
.
鐭ラ亾闂鐨勫彈鍔涙儏鍐碉紝鏍规嵁鐗涢】绗簩瀹氬緥姹傚嚭鐗╀綋鐨勫姞閫熷害锛屽啀缁撳悎鐗╀綋杩愬姩鐨勫垵濮嬫潯浠讹紝搴旂敤杩愬姩
瀛﹀叕寮忥紝鍙互姹傚嚭鐗╀綋鐨勮繍鍔ㄦ儏鍐碘�斺�斾换鎰忔椂鍒荤殑浣嶇Щ鍜岄�熷害
.
鍙楀姏鎯呭喌鈫?/p>
F
鍚?/p>
鈥?/p>
鈥?/p>
鈫?/p>
F
鍚?/p>
锛?/p>
ma
姹?/p>
a
锛?/p>
飪?/p>
飪?/p>
飪?/p>
飪?
飪?/p>
x
锛?/p>
v
0
t
锛?/p>
1
2
at
2
v
锛?/p>
v
0
锛?/p>
at
v
2
锛?/p>
v
2
0
锛?/p>
2
ax
鈫掓眰寰?/p>
x
銆?/p>
v
0
銆?/p>
v
銆?/p>
t
.
鈶″凡鐭ョ墿浣撶殑杩愬姩鎯呭喌锛屽垎鏋愭眰鍑虹墿浣撴墍鍙楃殑鏈煡鍔涙儏鍐?/p>
.
鐭ラ亾鐗╀綋鐨勮繍鍔ㄦ儏鍐碉紝搴旂敤杩愬姩瀛﹀叕寮忔眰鍑虹墿浣撶殑鍔犻�熷害锛屽啀搴旂敤鐗涢】杩愬姩瀹氬緥鎺ㄦ柇鎴栨眰鍑虹墿浣撳彈鍒?/p>
鐨勫悎澶栧姏锛屼粠鑰屽緱鍒伴渶姹傜殑鍔ㄥ姏瀛︾墿鐞嗛噺锛屽鍔涖�佽川閲忋�佸姩鎽╂摝鍥犵礌绛?/p>
.
杩愬姩鎯呭喌
鈥?/p>
鈥?/p>
鈥?/p>
鈥?/p>
鈥?/p>
鈥?/p>
鈥?/p>
鈥?/p>
鈫?/p>
鍖�鍙橀�熺洿绾胯繍鍔ㄥ叕寮?/p>
姹?/p>
a
鈥?/p>
鈥?/p>
鈫?/p>
F
鍚?/p>
锛?/p>
ma
鍙楀姏鎯呭喌锛?/p>
鐢变互涓婁袱绫婚棶棰樼殑鍒嗘瀽鍙煡锛氬姞閫熷害鏄敱杩愬姩瀛﹁繃娓″埌杩愬姩瀛︽垨鐢辫繍鍔ㄥ杩囨浮鍒板姩鍔涘蹇呯粡鐨勬ˉ姊?/p>
鈻?/p>
璇?/p>
鍫傝揪鏍囩粌涔?/p>
锛?/p>
1
A
銆?/p>
B
涓ょ墿浣撲互鐩稿悓鐨勫垵閫熷害婊戝埌鍚屼竴绮楃硻鐨勬按骞抽潰涓婏紝鑻ヤ袱鐗╀綋鐨勮川閲?/p>
m
A
锛?/p>
m
B
锛屼袱鐗╀綋涓庣矖绯欐按骞抽潰闂?/p>
鐨勫姩鎽╂摝鍥犳暟鐩稿悓锛屽垯涓ょ墿浣撴粦琛岀殑鏈�澶ц窛绂?/p>
x
A
涓?/p>
x
B
鐩告瘮涓?/p>
( )
A
锛?/p>
x
A
锛?/p>
x
B
B
锛?/p>
x
A
锛?/p>
x
B
C
锛?/p>
x
A
锛?/p>
x
B
D
锛庝笉鑳界‘瀹?/p>
鎬濊矾鐐规嫧锛氭湰棰樺凡鐭ヤ簡涓や釜鐗╀綋鐨勮川閲忓叧绯诲強绮楃硻姘村钩闈㈢殑鍔ㄦ懇鎿﹀洜绱犵浉绛夛紝鐩稿綋浜庣煡閬撲簡鍙楀姏鎯呭喌锛岃
姹傜殑鏄繍鍔ㄦ儏鍐?/p>
.
A
瑙ｆ瀽锛氱墿浣撳湪绮楃硻姘村钩闈笂鍙彈鎽╂摝鍔涚殑浣滅敤锛屾牴鎹墰椤跨浜屽畾寰嬫湁锛?/p>
渭
mg
=
ma
锛屽緱
a
=
渭
g
锛屽彲鐭ュ姞閫熷害
鐨勫ぇ灏忎笌鐗╀綋鐨勮川閲忔棤鍏筹紝鏁?/p>
a
A
锛?/p>
a
B
.
鍙堜袱鐗╀綋鍦ㄧ矖绯欐按骞抽潰涓婂潎鍋氬垵閫熷害鐩稿悓锛屾湯閫熷害鐩稿悓锛屽姞閫熷害鐩稿悓鐨勫寑鍑忛�熺洿绾胯繍鍔紝鏁呬綅绉荤浉鍚岋紝鎵�
浠?/p>
x
A
锛?/p>
x
B
.
锛?/p>
2
濡傚浘鎵�绀猴紝鎬昏川閲忎负
m
=75kg
鐨勬粦闆�呬互鍒濋�熷害
v
0
=8m/s
娌垮�捐涓?/p>
胃
=37
掳鐨勬枩闈㈠悜涓婅嚜鐢辨粦琛岋紝宸茬煡闆?/p>
姗囦笌鏂滈潰闂姩鎽╂摝鍥犳暟
渭
=0.25
锛屽亣璁炬枩闈㈣冻澶熼暱锛庝笉璁＄┖姘旈樆鍔涳紟璇曟眰锛?/p>