澶х墿
II
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3
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(1)
銆嬫ā鎷熻瘯棰?/p>
(3)
闂嵎鑰冭瘯鏃堕棿
120
鍒嗛挓
涓�銆侀�夋嫨棰?/p>
(
姣忛
3
鍒嗭紝鍏?/p>
30
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)
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3
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)
涓�涓皬鐝犲瓙鍙互鍦ㄥ崐寰勪负
r
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锛熷綋鏃嬭浆鏃讹紝
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骞朵笖鐩稿浜庣幆闈欐锛?/p>
鐝犲瓙鎵�鍦ㄧ殑鐜殑鍗婂緞鍋忕
鍨傜洿鏂瑰悜鐨勮搴︿负
(
涓�
)
锛燂紵
12蟺
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(
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)
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arccos(R
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g2g
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2)
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(
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)
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Arctg(2)(
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3
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)
)
銆?/p>
(d)
鐝犲瓙鐨勮川閲忓簲鐢?/p>
[
鍏堢敓鍐冲畾
]
锛熷湪鍥句腑鎵�绀虹殑绯荤粺涓?/p>
(
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)
锛屽鍔?/p>
f
閫氳繃涓嶅彲鎷変几鐨勭怀绱㈠拰鍒氬害绯绘暟
k = 200 n/m
鐨勮交寮圭哀鎱㈡參鍦板皢鐗╀綋
鎷夊埌鍦伴潰涓婏紝鐗╀綋鐨勮川閲?/p>
M=2
kg
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f
灏嗚閲婃斁銆傚湪鎷変笅
20
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(
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g
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10
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(b) 2
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(c) 3
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(d) 4
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(e) 20
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f(v)
锛岄�熺巼鍦?/p>
v1-v2
鑼冨洿鍐呯殑鍒?/p>
瀛愮殑骞冲潎閫熺巼涓?/p>
(
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)(
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)
v
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v
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dv
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(
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)vvf
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v
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dv/
锛?/p>
v2
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v2v1vf
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v
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dv
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锛?/p>
v1v1f
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v
锛?/p>
dv
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(
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)