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Ʉɨɨɪɞɢɧɚɬɬɚɪ ɬԛɪɿɧɞɟ: (151ɚ)
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¦ (Fsx G xs Fsy G ys Fsz G zs ) 0 .
Ⱥɥɞɵɦɟɧ ɦɿɧɞɟɬɬɿɥɿɤɬɿ ɞԥɥɟɥɞɟɣɦɿɡ. ɀɨԑɚɪɵɞɚ ɤɟɥɬɿɪɿɥɝɟɧ ɛɚɣɥɚɧɵɫɬɚɪɵ
ɛɚɪ, n ɧԛɤɬɟɞɟɧ ɬԝɪɚɬɵɧ ɦɟɯɚɧɢɤɚɥɵԕ ɠԛɣɟ ɛɨɥɫɵɧ. Ɉɫɵ ɠԛɣɟɧɿԙ ɛɚɪɥɵԕ
ɛɚɣɥɚɧɵɫɬɚɪɵɧ ɚɥɵɩ ɬɚɫɬɚɣɵԕ. Ɉɫɵ ɤɟɡɞɟ, ɠԛɣɟɧɿԙ ԥɪ ɧԛɤɬɟɫɿ ( M s ) ɟɪɤɿɧ
ɤԛɣɝɟ ɬԛɫɟɞɿ ɠԥɧɟ ɟɤɿ ɤԛɲɬɿԙ ԥɫɟɪɿɧɞɟ ɛɨɥɚɞɵ, ɨɥ ɤԛɲɬɟɪ: ɛɟɥɫɟɧɞɿ
o
ɤԛɲɬɟɪɞɿԙ ɬɟԙ ԥɫɟɪ ɟɬɭɲɿ ɤԛɲɿ – Fs ɠԥɧɟ ɢɞɟɚɥ ɛɚɣɥɚɧɵɫɬɚɪɞɵԙ ɬɟԙ ԥɫɟɪ
o
ɟɬɭɲɿ ɤԛɲɿ – N s (55-ɫɭɪɟɬ).
55-ɫɭɪɟɬ
Ȼɟɪɿɥɿɦ ɛɨɣɵɧɲɚ, ɤԛɲɬɟɪ ɠԛɣɟɫɿ ԥɪ ɧԛɤɬɟɞɟ ɬɟԙɞɟɫɬɿɪɿɥɝɟɧ, ɞɟɦɟɤ
oo o
Fs N s 0 . Ȼԝɥ ɤԛɲɬɟɪɞɿԙ ɜɢɪɬɭɚɥɞɵ ɨɪɵɧ ɚɭɵɫɬɵɪɭɥɚɪɞɚԑɵ (G rs )
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ɠԝɦɵɫɬɚɪɵ (Fs N s ) G rs 0 ɲɚɦɚɫɵɧɚ ɬɟԙ ɛɨɥɚɞɵ. Ɉɫɵɧɞɚɣ ɬɟԙɞɟɭɥɟɪɞɿ
ɠԛɣɟɧɿԙ ԥɪ ɧԛɤɬɟɫɿ ԛɲɿɧ ԕԝɪɵɩ, ɨɥɚɪɞɵԙ ɠɢɵɧɵɧ ɲɵԑɚɪɚɦɵɡ. əԑɧɢ
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¦ ¦ ¦(Fs N s ) G rs 0 , ɧɟɦɟɫɟ Fs G rs N s G rs 0 .
Ȼɚɣɥɚɧɵɫɬɚɪ ɢɞɟɚɥ ɛɨɥԑɚɧɞɵԕɬɚɧ, ɫɨԙԑɵ ɬɟԙɞɟɭɞɿԙ ɟɤɿɧɲɿ ɦԛɲɟɫɿ ɧԧɥɝɟ
ɬɟԙ ɛɨɥɚɞɵ, ɫɨɧɞɵԕɬɚɧ
oo
¦ Fs G rs 0 .
Ɉɫɵɦɟɧ ɦɿɧɞɟɬɬɿɥɿɤ ɞԥɥɟɥɞɟɧɞɿ.
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¦ȿɧɞɿ ɠɟɬɤɿɥɿɥɿɤɬɿ ɞԥɥɟɥɞɟɣɦɿɡ. Ȼɟɪɿɥɿɦ ɛɨɣɵɧɲɚ Fs G rs 0 ɛɨɥԑɚɧ-
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ɞɵԕɬɚɧ, ԥɪ ɧԛɤɬɟ ԛɲɿɧ ɬɟɩɟ-ɬɟԙɞɿɤ ɬɟԙɞɟɭɿ Fs N s 0 ɬԛɪɿɧɞɟ ɛɨɥɚɬɵɧɵɧ
ɞԥɥɟɥɞɟɭ ɤɟɪɟɤ. Ɉɥ ԛɲɿɧ ɫɬɚɬɢɤɚɞɚɧ ɛɟɥɝɿɥɿ ɦɵɧɚ ɚɧɵԕɬɚɦɚɧɵ
ɩɚɣɞɚɥɚɧɚɦɵɡ: ɟɝɟɪ ɬɵɧɵɲɬɵԕ ɤԛɣɞɟɝɿ ɟɪɤɿɧ ɧԛɤɬɟɥɟɪ ɠԛɣɟɫɿɧɟ ɛɟɥɝɿɥɿ ɛɿɪ
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