Mphamvu yokoka - mavuto ndi mayankho

1. Thupi la 1 kg kugwa kwaulere kuchokera kupumula, kuchokera kutalika kwa 10 m.

Dziwani:

(a) Ntchito yochitidwa ndi mphamvu of yokoka

(b) Kusintha kwa mphamvu yokoka

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²

Zodziwika:

Misa (m) = 1 kg

Kutalika (h) = 10 m

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²

Kunenepa (w) = mg = (1 kg)(10 m/s²) = 10 N

Yankho:

(a) Ntchito yochitidwa ndi mphamvu yokoka

W = wh = mgh

W = (1)(10)(10) = 100 Joule

(b) Kusintha kwa mphamvu yokoka

Kusintha kwa mphamvu yokoka kumafanana ndi ntchito yochitidwa ndi mphamvu yokoka.

ΔEP = 100 Joule

2. Chinthu cha 10 N chimatsika pansi pa malo otsetsereka osalala motsatira mamita awiri. Dziwani ntchito yochitidwa ndi mphamvu yolemera!

Zodziwika:

kulemera (w) = 10 N

w_x = uchimo θ = (10)(chimo 30^o) = (10)(0.5) = 5 N

d = 2 m

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²

Akufuna: ntchito yochitidwa ndi mphamvu yolemera

Yankho:

W = F d = w_x d = (5)(2) = 10 Joule

Yankho lina:

Tchimo 30^o = h / d

0.5 = maola / 2

h = (0.5)(2)

h = 1 m

Ntchito yochitidwa ndi mphamvu yolemera;

W = F d = wh = (10 N)(1 m) = 10 N m = 10 Joules

3. Chinthu cha magalamu 1,500 pa mamita 20 pamwamba pa nthaka, kugwa pansi mwaulere. Kodi mphamvu yokoka ya chinthucho ndi yotani? Kuthamanga chifukwa cha mphamvu yokoka ndi 10 m/s².

Zodziwika:

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²

Kulemera (m) = 1500 magalamu = 1500/1000 makilogalamu = 1.5 makilogalamu

Kutalika (h) = mamita 20

Akufuna: Mphamvu yokoka

Yankho:

PE = mgh = (1.5 kg)(10 m/s²)(20 m) = 300 kg m²/s² = 300 Joule

4. Kutengera chithunzi chomwe chili pansipa, ngati kulemera kwa chinthu 1 ndi 2 kg ndipo kulemera kwa chinthu 2 ndi 4 kg, Kuyerekeza mphamvu zomwe zingatheke pa chinthu 1 ndi chinthu 2 ndi…..

Zodziwika:

Kulemera kwa chinthu 1 (m₁) = 2 kilogalamu

Kulemera kwa chinthu 2 (m₂) = 4 kilogalamu

Kutalika 1 (h₁) = mamita 12

Kutalika 2 (h₂) = mamita 9

SE basi: Ckuyerekeza mphamvu zomwe zingatheke pa chinthu 1 ndi chinthu 2

Yankho:

PE = mgh

m = kulemera (gawo lake lapadziko lonse ndi kilogalamu, chidule cha kg)

g = kuthamanga chifukwa cha mphamvu yokoka (gawo lake lapadziko lonse lapansi ndi mamita pa sekondi imodzi, chidule m/s²)

h = kutalika (gawo lake lapadziko lonse ndi mita, chidule m)

PE = mphamvu yokoka (gawo lake lapadziko lonse lapansi ndi kg m²/s² kapena Joule)

Mphamvu yokoka ya chinthu 1:

EP₁ = m₁ gh₁= (2)(g)(12) = 24 g

Mphamvu yokoka ya chinthu 2:

EP₂ = m₂ gh₂ = (4)(g)(9) = 36 g

Ckuyerekeza mphamvu yomwe ingakhalepo ya chinthu 1 ndi chinthu 2:

PE₁ :PE₂

24 g: 36 g

24: 36

24/12: 36/12

2: 3

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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