Cov Teeb Meem Tau Daws Hauv Kev Kawm Txog Physics Yooj Yim

Dynamics ntawm cov khoom me me - teeb meem thiab kev daws teeb meem

1. Khoom A uas muaj qhov hnyav ntawm 6-kg thiab khoom B uas muaj qhov hnyav ntawm 4-kg txuas nrog los ntawm txoj hlua thiab rub los ntawm lub zog ntawm F = 60 N, raws li pom hauv daim duab hauv qab no. Tus coefficient ntawm kev sib txhuam kinetic ntawm hauv pem teb thiab ob qho khoom yog 0.5 (tan θ = ¾). Kev nrawm vim lub ntiajteb txawj nqus yog 10 m/s ^2. Qhov loj ntawm lub zog nruj yog dab tsi?

Paub:

Qhov hnyav ntawm yam khoom A (m_A) = 6 kg

Qhov hnyav ntawm yam khoom B (mB ₎ = 4 kg

Lub zog (F) = 60 Newton

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Qhov ceev thiab kev ntab hauv qhov sib npaug - cov teeb meem thiab kev daws teeb meem

1. Ib lub thaiv uas muab tso rau hauv ob lub kua uas muaj ntau hom sib txawv. Hauv cov kua A, muaj 0.6 feem ntawm ib yam khoom nyob hauv cov kua. Hauv cov kua B, muaj 0.5 feem ntawm ib yam khoom nyob hauv cov kua. Txheeb xyuas qhov sib piv ntawm qhov ceev ntawm cov kua A rau cov kua B.

Paub:

Qhov ceev ntawm thaiv = x

Ib feem ntawm cov khoom hauv cov kua A = 0.6

Qhov ceev ntawm cov kua A = y

Ib feem ntawm yam khoom hauv cov kua B = 0.5

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Kev txuag lub zog kho tshuab ntawm cov nplaim nkhaus - teeb meem thiab kev daws teeb meem

1. Yog tias lub pob qhov ceev ntawm qhov chaw A yog 6 m/s, lub pob qhov ceev ntawm qhov chaw B yog √92 m/s, thiab qhov kev nrawm vim lub ntiajteb txawj nqus yog g = 10 m/s ^2. Qhov siab ntawm qhov chaw B (h) yog dab tsi?

Paub:

Qhov ceev ntawm lub pob ntawm qhov chaw A (v)_A) = 6 m/s

Qhov ceev ntawm lub pob ntawm qhov chaw B (v _B ) = √92 m/s

Kev nrawm vim lub ntiajteb txawj nqus (g) = 10 m/s ²

Qhov siab ntawm A (h _A ) = 5.6 meters

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Center of gravity - teeb meem thiab kev daws teeb meem

1. Txheeb xyuas qhov sib koom ua ke ntawm qhov chaw nruab nrab ntawm lub ntiajteb txawj nqus ntawm yam khoom raws li qhia hauv daim duab hauv qab no.

Tshuaj:

Faib cov khoom ua peb ntu.

Thaj tsam ntawm ntu 1 (A ₁ ) = (2)(6) = 12 cm ²

Lub chaw nruab nrab nyob rau ntawm x axis (x ₁ ) = 1/2 (2) = 1 cm

Lub chaw nruab nrab nyob rau ntawm y axis (y ₁ ) = 1/2 (6) = 3 cm

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Torricelli's theorem - Cov teeb meem thiab kev daws teeb meem

1. Ib lub raj uas siab li 100 cm puv dej. Lub qhov Q nyob ntawm 10 cm saum av. Qhov deb ntawm kab rov tav (x) yog dab tsi?

Paub:

Qhov nrug ntawm qhov thiab qhov saum npoo dej (h) = 100 cm – 10 cm = 90 cm = 0.9 m

Kev nrawm vim lub ntiajteb txawj nqus (g) = 10 m/s ²

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Vector - teeb meem thiab kev daws teeb meem

Vector thiab Scalar

1. Ntawm cov kev xaiv hauv qab no, uas yog cov khub scalar-vector ...

A. Lub zog - kev nrawm

B. Lub zog siab

C. Kev Hloov Chaw - ​​qhov ceev

D. Tam sim no hluav taws xob - siab

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Lub tshuab microscope sib xyaw - teeb meem thiab kev daws teeb meem

1.

Raws li daim duab saum toj no, qhov loj tag nrho yog dab tsi? Xav tias muaj lub qhov muag ib txwm yog li qhov ze (N) = 25 cm.

Paub:

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Cov khoom siv lub cev Cov chav ntsuas Qhov ntev - Teeb meem thiab kev daws teeb meem

1.

Raws li lub rooj saum toj no, cov nqi twg muaj cov chav thiab qhov ntev tiag tiag.

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Kev nrawm ntawm radial - teeb meem thiab kev daws teeb meem

1. Daim duab twg hauv qab no qhia txog kev sib raug zoo ntawm kev nrawm ntawm centripetal lossis radial acceleration (a _R ) thiab linear velocity (v) hauv kev txav mus los ib puag ncig.

Tshuaj:

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Lub zog muaj peev xwm - cov teeb meem thiab cov kev daws teeb meem

Gravitational muaj peev xwm zog

1. Zog 4900 Joules siv los tsa ib yam khoom uas hnyav 50 kg mus rau qhov siab h. Qhov siab h yog dab tsi? Kev nrawm vim lub ntiajteb txawj nqus (g) = 9.8 ms ^-2.

Paub:

Kev hloov pauv ntawm lub zog muaj peev xwm (ΔPE) = 4900 Joules

Qhov hnyav ntawm yam khoom (m) = 50 kg

Kev nrawm vim lub ntiajteb txawj nqus (g) = 9.8 m/s ²

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