Kugwiritsa ntchito mphamvu yamakina kuti muchepetse kugwa - mavuto ndi mayankho

1. Thupi lolemera makilogalamu 1 limagwa momasuka kuchokera pamalo opumula, kuchokera kutalika kwa mamita 80. Kuthamanga chifukwa cha mphamvu yokoka ndi 10 m/s ^{2. Kodi} mphamvu ya kinetic ndi chiyani thupi likagunda pansi?

Zodziwika:

Kulemera (m) = 1 kg

Kutalika (h) = 80 m

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s ²

Kufunidwa: mphamvu ya kinetic pamene thupi ligunda pansi

Yankho:

Mphamvu yoyambirira ya makina (ME _o ) = mphamvu yokoka (PE)

M E _o = P E = mgh = (1)(10)(80) = 800 Joules

Mphamvu yomaliza yamakina (M E _t ) = mphamvu ya kinetic (K E )

Mfundo yosungira mphamvu zamakanika :

M E _o = M E _t

P E = K E

800 = K E

Mphamvu yomaliza ya kinetic ndi 800 Joules.

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2. Thupi lolemera makilogalamu 4 limagwa momasuka kuchokera pamalo opumula, kuchokera kutalika kwa mamita 10. Kuthamanga chifukwa cha mphamvu yokoka ndi 10 ms ^-2 . Kodi mphamvu ya kinetic ndi liwiro la mamita 5 pamwamba pa nthaka ndi chiyani?

Zodziwika:

Kusintha kwa kutalika (h) = 10 – 5 = mamita 5 s

Kulemera (m) = 4 kg

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s ²

Kufunidwa: Mphamvu ya kinetic pa mamita 5 pamwamba pa nthaka ndi liwiro pa mamita 5 pamwamba pa nthaka

Yankho:

(a) Mphamvu ya kinetic pamtunda wa mamita 5 kuchokera pansi

Mphamvu yoyambirira yamakina (M E _o ) = mphamvu yokoka (P E )

M E _o = P E = mgh = (4)(10)(5) = 200 Joules

Mphamvu yomaliza yamakina (EM _t ) = mphamvu ya kinetic (EK)

M E _t = K E

Mfundo yosungira mphamvu ya makina imati mphamvu yoyamba ya makina = mphamvu yomaliza ya makina.

M E _o = M E _t

200 = K E

Mphamvu ya kinetic pa mamita 5 pamwamba pa nthaka ndi 200 Joules.

(b) liwiro la mamita 5 kuchokera pansi

Mphamvu yoyambirira yamakina (M E _o ) = mphamvu yomaliza yamakina (M E _t )

P E = K E

200 = ½ mv ²

2(200) / 4 = v ²

100 = v ²

v = √100

v = 10 m/s

Liwiro la thupi pa mamita 5 pamwamba pa nthaka ndi 10 m/s.

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3. Mango imagwa momasuka kuchokera pamalo opumula, kuchokera kutalika kwa mamita awiri. Kuthamanga chifukwa cha mphamvu yokoka ndi 10 ms ^-2 . Dziwani liwiro la mango ikagunda pansi.

Zodziwika:

Kutalika (h) = mamita awiri s

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s ²

Kufunidwa: liwiro la mango likafika pansi.

Yankho:

Mphamvu yoyambirira yamakina (M E _o ) = mphamvu yokoka (P E )

M E = PE = mgh = m (10)(2) = 20 m

Mphamvu yomaliza yamakina (M E _t ) = mphamvu ya kinetic (K E )

M E _t = K E = ½ mv ²

Mfundo yosungira mphamvu ya makina imati mphamvu yoyamba ya makina = mphamvu yomaliza ya makina.

M E _o = M E _t

20 m = ½ mv ²

20 = ½ v ²

2(20) = v ²

40 = v ²

v = √40 = √(4)(10) = 2√10 m/ s

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1. Ntchito yochitidwa ndi mphamvu ndi mavuto ndi mayankho
2. Mavuto ndi mayankho a mphamvu zogwirira ntchito
3. Mavuto ndi mayankho a mfundo za mphamvu za makina ndi ntchito
4. Mavuto ndi mayankho a mphamvu yokoka
5. Mphamvu yomwe ingagwiritsidwe ntchito pa mavuto ndi mayankho a masika otanuka
6. Mavuto amagetsi ndi mayankho
7. Kugwiritsa ntchito mphamvu yamakina yosungira kuti munthu agwe momasuka
8. Kugwiritsa ntchito mphamvu yamakina yosungira kayendedwe ka mmwamba ndi pansi mu kayendedwe ka free fall
9. Kugwiritsa ntchito kusunga mphamvu ya makina kuti ayende pamalo opindika
10. Kugwiritsa ntchito mphamvu yamakina yosungira kuti munthu ayende pa ndege yopendekeka
11. Kugwiritsa ntchito mphamvu ya makina yosungira kuti zigwiritsidwe ntchito poyendetsa zinthu