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

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

1.

Cov nqi ntawm lub cev, cov chav, 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.

Tshuaj:

1) zog

Qhov sib npaug ntawm lub zog yog p = mv

p = lub zog, m = loj, v = qhov ceev

Qhov loj ntawm pawg = M thiab qhov loj ntawm qhov ceev = L/T = LT-1 yog li ntawd qhov dimension ntawm momentum = MLT-1

Chav ntsuas thoob ntiaj teb ntawm lub zog = kg m/s = kg ms-1

2) Lub zog

Tus qauv ntawm lub zog yog F = ma

F = lub zog, m = pawg, ib = acceleration

Qhov loj ntawm pawg = M thiab qhov loj ntawm kev ua kom nrawm = L/T2 = LT-2 yog li ntawd qhov loj ntawm lub zog yog MLT-2

Chav ntsuas thoob ntiaj teb ntawm lub zog yog kg m/s2 = kg ms-2

3) Lub hwj chim

Tus qauv ntawm lub zog yog W = F d

W = ua haujlwm, F = lub zog, d = kev hloov chaw

Qhov loj ntawm lub zog = MLT-2 thiab qhov ntev ntawm xaav yog L yog li ntawd qhov dimension ntawm ua hauj lwm yog [M][L][T]-2 [L] = [M][L]2[T]-2

Tus qauv ntawm lub zog yog P = W/t

P = zog, W = ua haujlwm, t = lub sijhawm

Qhov Loj ntawm txoj haujlwm = [M][L]2[T]-2 thiab qhov ntev ntawm lub sijhawm = [T] yog li ntawd qhov ntev ntawm hwj chim = [M][L]2[T]-2 / [T] = [M][L]2[T]-2 [T]-1 = [M][L]2[T]-3

Chav ntsuas thoob ntiaj teb ntawm lub zog yog kg m2/s3 = kg/m²2 s-3

2. Raws li lub rooj hauv qab no, ntau ntau nrog cov chav thiab qhov ntev raug yog ....

Cov nqi ntawm lub cev, cov chav, qhov ntev - teeb meem thiab kev daws teeb meem 1

Tshuaj:

Qhov sib npaug ntawm lub zog yog p = mv.

Lub chav ntawm qhov hnyav (m) yog kilogram (kg) thiab lub chav ntawm qhov ceev (v) yog meter ib ob (m/s) yog li ntawd lub chav ntawm lub zog yog kg m/s los yog kg m/sKilogram yog qhov ntev ntawm pawg nrog qhov ntev ntawm [M], 'meter' yog ib chav ntawm qhov ntev nrog qhov ntev ntawm [L], qhov thib ob yog chav ntawm lub sijhawm nrog qhov ntev ntawm [T] yog li ntawd qhov ntev ntawm lub zog yog [M][L]/[T] los yog [M][L][T]-1.

kuj saib  Kub thiab cua sov - teeb meem thiab kev daws teeb meem

Qhov sib npaug ntawm lub zog yog F = ma.

Chav ntawm Qhov hnyav (m) yog kilogram (kg) thiab chav ntawm qhov kev nrawm (a) yog meters ib ob squared (m/s)2) yog li ntawd lub unit ntawm lub zog yog kg m/s2 los yog kg ms-2Chav ntawm qhov hnyav yog kilogram nrog qhov ntev ntawm [M], chav ntawm qhov ntev yog meter nrog qhov ntev ntawm [L], chav ntawm lub sijhawm yog qhov thib ob nrog qhov ntev ntawm [T] yog li ntawd qhov ntev ntawm lub zog yog [M][L]/[T]2 los yog [M][L][T]-2

Qhov sib npaug ntawm lub zog yog P = W/t, qhov sib npaug ntawm kev ua haujlwm yog W = F s, qhov sib npaug ntawm lub zog yog F = m a.

Chav ntawm qhov hnyav yog kilogram (kg), chav ntawm qhov kev nrawm yog meters ib ob squared (m/s)2) yog li ntawd lub chav ntawm lub zog yog kg m / s2Lub chav ntawm kev hloov chaw yog 'meter' (m), lub chav ntawm lub zog yog kg m/s2 yog li ntawd, chav ua haujlwm yog kg m / s2 xm = kgm2/s2Lub sijhawm yog thib ob (s), ib chav ua haujlwm yog kg m2/s2 yog li ntawd lub chav ntawm lub zog yog kg m2/s2 : s = kg/m2/s3 los yog kg m2 s-3.

Chav ntawm qhov hnyav yog kilogram nrog qhov ntev ntawm [M], chav ntawm qhov ntev yog 'meter' nrog qhov ntev ntawm [L], chav ntawm lub sijhawm yog qhov thib ob nrog qhov ntev ntawm [T] yog li ntawd qhov ntev ntawm lub zog yog [M] [L]2/[T]3 los yog [M] [L]2[T]-3.

3. Lub zog yog txiav txim siab raws li qhov nrawm uas ua haujlwm tiav. Los yog lub zog yog qhov sib piv ntawm kev ua haujlwm rau lub sijhawm. Txheeb xyuas qhov loj ntawm lub zog.

kuj saib  Txoj Cai Charles (kev nyuaj siab tas li) - teeb meem thiab kev daws teeb meem

Tshuaj:

Qhov sib npaug ntawm lub zog:

Cov teeb meem ntawm cov khoom siv, cov chav, thiab qhov ntev 3

W = ua haujlwm, F = lub zog, a = kev nrawm, v = qhov ceev, d = qhov deb, t = lub sijhawm luv

m = pawg (dimension ntawm pawg = M), d = nrug (qhov ntev ntawm qhov deb = L), t = lub sijhawm (qhov ntev ntawm lub sijhawm = T).

Qhov loj ntawm lub zog:

Cov nqi ntawm lub cev, cov chav, qhov ntev - teeb meem thiab kev daws teeb meem 4

  1. Qhov ntau npaum li cas yog dab tsi?
    • teb: Ib qho khoom siv yog ib yam khoom ntawm ib yam khoom lossis ib lub cev uas tuaj yeem ntsuas thiab ntsuas tau. Piv txwv li suav nrog qhov hnyav, qhov ntev, lub sijhawm, qhov kub thiab txias, thiab lub zog.
  2. Vim li cas cov units thiaj tseem ceeb hauv kev ntsuas cov khoom siv?
    • teb: Cov chav ntsuas muab ib txoj hauv kev txheem los qhia qhov loj ntawm ib qho khoom siv. Lawv ua kom meej, raug, thiab sib xws hauv kev ntsuas, ua rau muaj kev sib txuas lus meej thiab kev nkag siab ntawm cov kws tshawb fawb thiab cov engineers thoob ntiaj teb.
  3. Qhov txawv ntawm qhov tseem ceeb (lossis qhov pib) thiab qhov muaj nqis los ntawm yog dab tsi?
    • teb: Cov nqi tseem ceeb yog cov nqi tseem ceeb ntawm lub cev uas txiav txim siab ywj pheej thiab tsim lub hauv paus rau lwm yam kev ntsuas. Piv txwv li suav nrog qhov ntev, qhov hnyav, thiab lub sijhawm. Cov nqi uas tau los ntawm kev sib xyaw ua ke ntawm cov nqi tseem ceeb no, xws li thaj chaw (ntev x dav) lossis qhov ceev (qhov deb/lub sijhawm).
  4. Qhov ntev yog dab tsi? Lawv muaj feem cuam tshuam li cas rau cov khoom muaj nqis hauv lub cev?
    • teb: Qhov ntev yog hais txog qhov xwm txheej thiab hom ntawm cov khoom siv lub cev (piv txwv li, [L] rau qhov ntev, [M] rau qhov hnyav, [T] rau lub sijhawm). Lawv sawv cev rau lub zog uas cov khoom siv tseem ceeb raug tsa los sawv cev rau ib qho khoom siv lub cev tshwj xeeb.
  5. Txhais li cas los ntawm "dimensional formula" ntawm ib qho physical quantity?
    • teb: Ib daim qauv ntsuas qhov ntev qhia txog kev sib raug zoo ntawm ib qho khoom siv hauv nws qhov ntev yooj yim. Piv txwv li, daim qauv ntsuas qhov ntev rau qhov ceev yog , qhia tias qhov ceev yog los ntawm qhov ntev ([L]) faib los ntawm lub sijhawm ([T]).
  6. Lub SI (International System of Units) system tseem ceeb npaum li cas rau kev tshawb fawb niaj hnub no thiab kev tsim kho vaj tse?
    • teb: Lub kaw lus SI muab cov txheej txheem txheem uas lees txais thoob ntiaj teb rau kev ntsuas cov khoom siv. Qhov no ua kom muaj kev sib npaug, txo kev tsis meej pem, thiab ua rau muaj kev koom tes ntawm cov kws tshawb fawb thiab cov engineers thoob ntiaj teb.
  7. Qhov txawv ntawm qhov ntau ntawm scalar thiab qhov ntau ntawm vector yog dab tsi?
    • teb: Ib qho scalar quantity tsuas muaj qhov loj xwb (piv txwv li, mass, temperature), thaum ib qho vector quantity muaj ob qho tib si qhov loj thiab kev coj (piv txwv li, velocity, force).
  8. Vim li cas peb thiaj siv tsis tau cov chav ntsuas los ntsuas cov khoom siv?
    • teb: Kev siv cov chav ntsuas uas tsis raws cai yuav ua rau muaj kev tsis meej pem, tsis sib xws, thiab kev sib txuas lus tsis meej hauv kev ntsuas thiab kev xam lej. Cov chav ntsuas uas raug teeb tsa ua kom ntseeg tau tias kev ntsuas tau nkag siab thoob plaws thiab sib piv tau.
  9. Kev tshuaj xyuas qhov ntev yuav pab tau li cas hauv physics?
    • teb: Kev tshuaj xyuas qhov ntev pab txheeb xyuas qhov tseeb ntawm cov qauv sib npaug los ntawm kev kuaj xyuas qhov sib xws ntawm qhov ntev ntawm ob sab ntawm cov qauv sib npaug. Nws kuj tseem siv tau los nrhiav kev sib raug zoo ntawm cov khoom sib txawv.
  10. Vim li cas qee qhov ntau thiab tsawg, xws li refractive index lossis coefficient of friction, thiaj suav tias tsis muaj qhov ntev?
  • teb: Cov khoom uas tsis muaj qhov ntev yog cov piv ntawm cov khoom zoo sib xws, thiab yog li ntawd lawv qhov ntev txiav tawm. Piv txwv li, qhov ntsuas refractive yog qhov piv ntawm qhov ceev ntawm lub teeb hauv lub tshuab nqus tsev rau nws qhov ceev hauv ib qho chaw nruab nrab. Vim tias ob qho tib si yog qhov ceev, lawv qhov ntev txiav tawm, ua rau qhov ntsuas refractive tsis muaj qhov ntev.
Print Friendly, PDF & Email