1
绗竴绔?/p>
璐ㄧ偣杩愬姩瀛?/p>
涓�銆佽繍鍔ㄧ殑鎻忚堪锛堥噺锛?/p>
---
浣嶇煝銆佷綅绉汇�侀�熷害銆佸姞閫熷害锛屽垏鍚戝姞閫熷害銆佹硶鍚戝姞閫熷害銆佽建杩?/p>
1
銆佽川鐐规部
X
杞存柟鍚戣繍鍔紝鍏惰繍鍔ㄦ柟绋嬩负
x=2t
2
+4t-3(SI)
锛屽垯璐ㄧ偣浠绘剰鏃跺埢鐨勯�熷害琛ㄨ揪寮忎负
v
t
=____________,
鍔犻�熷害琛ㄨ揪寮?/p>
a
t
=____________
锛?/p>
鍓嶄袱绉掔殑浣嶇Щ澶у皬涓?/p>
____________
锛?/p>
璺▼
涓?/p>
____________
銆?/p>
2
銆佽川鐐圭殑杩愬姩鏂圭▼涓?/p>
x=2t,y=1o-2t
2
锛?/p>
SI
锛?/p>
,
鍒欒川鐐圭殑杞ㄨ抗鏂圭▼涓?/p>
____________
锛?/p>
t=2s
鏃讹紝璐?
鐐逛綅缃?/p>
飥?/p>
r
飦?
____________
锛岄�熷害
v
飦?/p>
=____________
銆?/p>
3
銆?/p>
璐ㄧ偣浣滃崐寰勪负
R
鐨勫渾鍛ㄨ繍鍔紝
鍏惰繍鍔ㄦ柟绋嬩负
S=2t
2
,(
鍒囧悜銆?/p>
娉曞悜鐨勫崟浣嶇煝閲忓垎鍒负
0
飦?/p>
飦?/p>
鍜?/p>
0
n
飦?
)
锛?/p>
鍒?/p>
t
鏃?/p>
鍒?/p>
璐?/p>
鐐?/p>
閫?/p>
鐜?/p>
v=____________
锛?/p>
閫?/p>
搴?/p>
v
飦?
=____________
锛?/p>
鍒?/p>
鍚?/p>
鍔?/p>
閫?/p>
搴?/p>
澶?/p>
灏?
飦?/p>
a
=____________
锛屾硶鍚戝姞閫熷害澶у皬
n
a
=____________
锛?/p>
鎬诲姞閫熷害
a
飦?
=____________
銆?/p>
4
銆佷笅鍒楄〃杩颁腑姝ｇ‘鐨勬槸锛?/p>
锛?/p>
锛?/p>
A
锛氬湪鏇茬嚎杩愬姩涓紝璐ㄧ偣鐨勫姞閫熷害涓�瀹氫笉涓洪浂锛?/p>
B
锛氶�熷害涓洪浂鏃讹紝鍔犻�熷害涓�瀹氫负闆讹紱
C
锛氳川鐐圭殑鍔犻�熷害涓烘亽鐭㈤噺鏃讹紝鍏惰繍鍔ㄨ建杩硅繍鍔ㄤ负鐩寸嚎锛?/p>
D
锛氳川鐐瑰湪
X
杞翠笂杩愬姩锛岃嫢鍔犻�熷害
a<0
锛屽垯璐ㄧ偣涓�瀹氬仛鍑忛�熻繍鍔ㄣ�?/p>
5
銆?/p>
璐ㄧ偣浣滅洿绾胯繍鍔ㄧ殑杩愬姩瀛︽柟绋嬩负
x
锛?/p>
3
t
-
5
t
3
+ 6 (SI)
锛屽垯璇ヨ川鐐逛綔锛?/p>
锛?/p>
A
锛氬寑鍔犻�熺洿绾胯繍鍔紝鍔犻�熷害娌?/p>
x
杞存鏂瑰悜锛?/p>
B
锛氬寑鍔犻�熺洿绾胯繍鍔紝鍔犻�熷害娌?/p>
x
杞磋礋鏂瑰悜锛?/p>
C
锛氬彉鍔犻�熺洿绾胯繍鍔紝鍔犻�熷害娌?/p>
x
杞存鏂瑰悜锛?/p>
D
锛氬彉鍔犻�熺洿绾胯繍鍔紝鍔犻�熷害娌?/p>
x
杞磋礋鏂瑰悜锛?/p>
6
銆佷竴璐ㄧ偣娌?/p>
x
杞翠綔鐩寸嚎杩愬姩锛屽叾
v
飥?/p>
t
鏇茬嚎濡傚浘鎵�绀猴紝濡?/p>
t
=0
鏃讹紝璐ㄧ偣浣嶄簬鍧愭爣鍘?/p>
鐐癸紝鍒?/p>
t
=4.5 s
鏃讹紝璐ㄧ偣鍦?/p>
x
杞翠笂鐨勪綅缃负
锛?/p>
锛?/p>
(A)
5m
锛?/p>
(B) 2m
锛?/p>
(C) 0
锛?/p>
(D)
飥?/p>
2 m
锛?/p>
(E)
飥?/p>
5 m.
7
銆?/p>
鍦?/p>
x
杞翠笂浣滃彉鍔犻�熺洿绾胯繍鍔ㄧ殑璐ㄧ偣锛?/p>
宸茬煡鍏跺垵閫熷害涓?/p>
0
v
锛?/p>
鍒濆浣嶇疆涓?/p>
x
0
锛?/p>
鍔犻�熷害
2
Ct
a
飥?/p>
锛?/p>
鍏?/p>
涓?/p>
C
涓?/p>
甯?/p>
閲?/p>
锛?/p>
锛?/p>
鍒?/p>
鍏?/p>
閫?/p>
搴?/p>
涓?/p>
鏃?/p>
闂?/p>
鐨?/p>
鍏?/p>
绯?/p>
涓?/p>
飥?/p>
v
__________
锛?/p>
杩?/p>
鍔?/p>
瀛?/p>
鏂?/p>
绋?/p>
涓?/p>
飥?/p>
x
____________
锛?/p>
8
銆佷竴璐ㄧ偣鍦?/p>
XOY
骞抽潰鍐呰繍鍔紝鍏惰繍鍔ㄦ柟绋嬩负
j
t
i
t
r
飦?/p>
飦?/p>
飦?/p>
)
2
10
(
4
2
飥?/p>
飥?/p>
飥?/p>
,
璐ㄧ偣鐨勪綅缃煝閲忎笌閫?
搴︾煝閲忔伆濂藉瀭鐩寸殑鏃跺埢涓?/p>
__________
銆?/p>
9
銆佽川鐐逛綔鍗婂緞涓?/p>
m
R
5
.
0
飥?/p>
鐨勫渾鍛ㄨ繍鍔紝鍏惰鍧愭爣涓庢椂闂寸殑鍏崇郴涓猴細
飥?/p>
飥?/p>
SI
t
t
3
3
飥?/p>
飥?/p>
飦?
锛?
t=2 s
鏃讹紝鍒欒川鐐圭殑瑙掑潗鏍囦负
__________
銆佽閫熷害涓?/p>
__________
鍜岃鍔犻�熷害涓?/p>
__________
銆?/p>
10
銆佽川鐐逛綔鏇茬嚎杩愬姩鐨勬柟绋嬩负
)
(
4
,
2
2
SI
t
y
t
x
飥?/p>
飥?/p>
飥?/p>
锛屽垯鍏惰建杩规柟绋嬩负
__________
t
鏃跺埢璐ㄧ偣鐨勫垏鍚戝姞閫熷害
飥?/p>
飦?/p>
a
__
____
锛屾硶鍚戝姞閫熷害
a
n
=__
____
銆?/p>
11
銆佷竴鑸逛互閫熺巼
30km/h
鍚戞涓滅洿绾胯椹讹紝鍙︿竴灏忚墖鍦ㄥ叾鍓嶆柟浠ラ�熺巼
40km/h
鍚戞鍖楁柟鍚戠洿
绾胯椹讹紝鍒欏湪鑸逛笂瑙傚療鍒板皬鑹囩殑閫熺巼涓?/p>
__________
銆佹柟鍚戜负
__________
銆?/p>
1
4.5
4
3
2.5
2
飥?/p>
1
1
2
t
(s)
v
(m/s)
O