Kev sib npaug ntawm lub zog

3 teeb meem thiab kev daws teeb meem txog Momentum equation

1. Yog tias qhov ceev ntawm yam khoom dhau los ua 5 npaug ntawm nws qhov ceev qub, ces qhov zog ntawm yam khoom dhau los ua ….. nws qhov zog qub.

Paub:

Qhov ceev pib = v

Qhov ceev kawg = 5v

Qhov hnyav = 1

SE pob: zog

tshuaj:

Cov mis mos ntawm lub zog

p = mv = 1 (5) = 5

Yog tias qhov ceev yog 5 npaug ntawm qhov qub thiab qhov hnyav yog qhov ruaj khov ces lub zog yog 5 npaug ntawm qhov qub.

2. Ib yam khoom raug pov rau saum ib lub dav hlau du thiab nqes nrog qhov ceev pib ntawm 10 m/s. Lub kaum sab xis ntawm lub dav hlau nqes mus rau kab rov tav yog 30^oYog tias g = 10 m/s², ces yog tias qhov hnyav ntawm yam khoom yog 2 kg, lub zog ntawm yam khoom tom qab 1 vib nas this yog ...

Paub:

Qhov ceev pib (v_o) = 10 m/s

Lub kaum sab xis = 30^o

Kev nrawm vim lub ntiajteb txawj nqus (g) = 10 m/s²

Qhov hnyav (m) = 2 kg

SE pob: Lub zog (p)

tshuaj:

Cov Qauv Zog

P = mv = (2 kg)(10 m/s) = 20 kg m/s

Lub zog tsis nyob ntawm qhov hnyav (w = mg).

3. Ib lub mos txwv raug tua nrog qhov ceev ntawm 10 m/s. Yog tias qhov hnyav ntawm lub mos txwv yog 20 grams, xam qhov momentum ntawm lub mos txwv.

Paub:

Qhov hnyav ntawm lub mos txwv (m) = 20 grams = 20/1000 kg = 0.02 kg

Ceev (v) = 10 m/s

SE pob: Lub zog (p)

tshuaj:

Cov mis mos ntawm lub zog

p = mv = (0,02 kg)(10 m/s) = 0,2 kg m/s