绗洓绔?/p>
涔犻
4-1
宸茬煡
F
1
=60N
锛?/p>
F
2
=80N
锛?/p>
F
3
=150N
锛?/p>
m=
锛岃浆鍚戜负閫嗘椂閽堬紝胃
=30
掳鍥句腑璺濈鍗曚綅涓?/p>
m
銆傝瘯姹傚浘涓姏绯诲悜
O
鐐圭畝鍖栫粨鏋滃強鏈�缁?/p>
缁撴灉銆?/p>
4-2
宸茬煡鐗╀綋鎵�鍙楀姏绯诲鍥炬墍绀猴紝
F=10Kn
锛?/p>
m=
锛岃浆鍚戝鍥俱�?/p>
锛?/p>
a
锛夎嫢閫夋嫨
x
杞翠笂
B
鐐逛负绠�鍖栦腑蹇冿紝鍏朵富鐭?/p>
L
B
=
锛岃浆鍚戜负椤?/p>
鏃堕拡锛岃瘯姹?/p>
B
鐐圭殑浣嶇疆鍙婁富鐭?/p>
R
鈥欍�?/p>
锛?/p>
b
锛夎嫢閫夋嫨
CD
绾夸笂
E
鐐逛负绠�鍖栦腑蹇冿紝
鍏朵富鐭?/p>
L
E
=
锛?/p>
杞悜涓洪『
鏃堕拡锛屛?/p>
=45
掳锛岃瘯姹備綅浜?/p>
CD
鐩寸嚎涓婄殑
E
鐐圭殑浣嶇疆鍙婁富鐭?/p>
R
鈥欍�?/p>
4-3
璇曟眰涓嬪垪鍚勬鎴栧垰鏋剁殑鏀骇鍙嶅姏銆?/p>
瑙ｏ細
锛?/p>
a
锛?/p>
鍙楀姏濡傚浘