Nkag Siab Txog Qhov Deb
Qhov deb yog qhov ntev ntawm txoj kev uas ib yam khoom taug kev. Qhov deb yog ib qho scalar quantity, ib qho physical quantity uas tsuas muaj magnitude thiab tsis muaj direction. Lub thoob ntiaj teb ntawm qhov deb yog lub 'meter', luv m. Lub cim rau qhov deb yog s.
Kev Txhais ntawm Kev Hloov Chaw
Kev hloov chaw yog qhov kev hloov chaw ntawm ib yam khoom. Kev hloov chaw yog ib qho vector quantity, ib qho physical quantity uas muaj ob qho tib si larginity thiab direction. Kev hloov chaw tuaj yeem qhia ua ib qho cardinal direction (sab qaum teb, sab hnub tuaj, sab qab teb, sab hnub poob, thiab lwm yam) lossis siv cov lus sab laug, sab xis, saum toj, lossis hauv qab.
Kawm cov lus nug piv txwv hauv qab no kom koj nkag siab zoo dua txog lub ntsiab lus ntawm qhov deb thiab kev hloov chaw thiab tuaj yeem paub qhov txawv ntawm qhov deb thiab kev hloov chaw kom raug.
Piv txwv teeb meem.
1. Ib tug tub ntxhais kawm taug kev 2 meters mus rau sab hnub tuaj. Tus tub ntxhais kawm ntawd nyob deb npaum li cas thiab txav mus deb npaum li cas?
Kev Sib Tham
a = qhov chaw pib, b = qhov chaw kawg
Qhov Nrug = 2 meters
Qhov ntau ntawm kev hloov chaw = 2 meters, kev taw qhia ntawm kev hloov chaw = sab hnub tuaj
2. Ib tug tub ntxhais kawm taug kev 2 meters mus rau sab hnub tuaj, tom qab ntawd taug kev 2 meters mus rau sab hnub poob. Tus tub ntxhais kawm ntawd nyob deb npaum li cas thiab txav mus deb npaum li cas?
Kev Sib Tham
a = qhov chaw pib, b = qhov chaw kawg
Qhov Nrug = 2 meters + 2 meters = 4 meters
Qhov loj ntawm qhov kev hloov chaw = 0.
Cov tub ntxhais kawm tsis txav mus vim tias qhov chaw kawg yog tib yam li qhov chaw pib.
3. Ib tug tub ntxhais kawm taug kev 2 meters mus rau sab hnub tuaj, tom qab ntawd taug kev 1 meters mus rau sab hnub poob. Tus tub ntxhais kawm ntawd nyob deb npaum li cas thiab txav mus deb npaum li cas?
Kev Sib Tham
a = qhov chaw pib, b = qhov chaw kawg
Qhov Nrug = 2 meters + 1 meters = 3 meters
Qhov ntau ntawm kev hloov chaw = 2 meters - 1 meter = 1 meter, kev hloov chaw = sab hnub tuaj.
Kawm cov piv txwv ntawm qhov deb thiab kev hloov chaw , kom koj nkag siab zoo dua txog qhov deb thiab kev hloov chaw.
