Mphamvu yokoka - mavuto ndi mayankho

1. Thupi lolemera makilogalamu 1 litagwa kuchokera pamalo opumula, kuchokera kutalika kwa mamita 10.

Dziwani:

(a) Ntchito yochitidwa ndi mphamvu yokoka

(b) Kusintha kwa mphamvu yokoka

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

Zodziwika:

Kulemera (m) = 1 kg

Kutalika (h) = 10 m

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

Kulemera (w) = mg = (1 kg)(10 m/s ² ) = 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.

Δ EP = 100 Joule

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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 = w uchimo θ = (10)(tchimo 30 ^o ) = (10)(0.5) = 5 N

d = 2 m

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

Kufunidwa: ntchito yochitidwa ndi mphamvu zolemera

Yankho:

W = F d = w _x d = (5)(2) = 10 Joules

Yankho lina:

Sin 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

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3. Chinthu cholemera magalamu 1,500 chili pamtunda wa mamita 20 kuchokera pansi , kugwa momasuka pansi. Kodi mphamvu yokoka ya chinthucho ndi yotani? Kuthamanga chifukwa cha mphamvu yokoka ndi 10 m/s ².

Zodziwika:

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

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

Kutalika (h) = mamita 20

Kufunidwa: Mphamvu yokoka

Yankho:

PE = mgh = (1.5 kg)(10 m/s ² )(20 m) = 300 kg m ² /s ² = 300 Joules

4. Kutengera chithunzi chomwe chili pansipa, ngati kulemera kwa chinthu 1 ndi 2 kg ndipo kulemera kwa chinthu 2 ndi 4 kg, kuyerekeza kwa mphamvu yomwe ingakhalepo ya chinthu 1 ndi chinthu 2 ndi ....

Zodziwika:

Kulemera kwa chinthu 1 (m₁) = 2 kilogalamu

Kulemera kwa chinthu 2 (m2 ₎ = makilogalamu 4

Kutalika 1 (maola ₁ ) = mamita 12

Kutalika 2 (maola ₂ ) = mamita 9

Kufunidwa: Kuyerekeza 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/s ² )

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

PE = mphamvu yokoka (gawo lake lapadziko lonse lapansi ndi kg m2 ^/ s ² kapena Joule)

Mphamvu yokoka ya chinthu 1:

EP ₁ = m ₁ gh ₁ = (2) (g) (12) = 24 g

Mphamvu yokoka ya chinthu 2:

EP ₂ = m ₂ gh ₂ = (4) (g) (9) = 36 g

Kuyerekeza mphamvu yomwe ingakhalepo ya chinthu 1 ndi chinthu 2:

PE ₁ : PE ₂

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