Ntchito yapaintaneti Mphamvu yokoka Mphamvu ya kinetic - Mavuto ndi Mayankho

4 Ntchito yapaintaneti Mphamvu yokoka Mphamvu ya kinetic - Mavuto ndi Mayankho

1. Chinthu cholemera makilogalamu 5 chomwe chili pamtunda wa mamita 10 kuchokera pansi. Kuthamanga chifukwa cha mphamvu yokoka ndi 10 m/s²Kodi ndi chiyani ntchito Kodi mwachitapo kanthu kuti musunthe mmwamba kufika pamtunda wa mamita 15 kuchokera pansi?

Zodziwika:

Misa ya chinthu (m) = 5 kg

Kutalika (h) = mamita 10

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

SE basi: Ntchito inachitidwa pa chinthucho kuti chikwere pamwamba pa nthaka mamita 15.

Yankho:

W = F d = wh = mgh

W = ntchito, F = mphamvu, d = kusamuka, w = kulemera, h = kutalika, m ​​= kulemera, g = kuthamanga chifukwa cha mphamvu yokoka

Ntchito yochitidwa pa chinthucho:

W = mgh = (5 kg)(10 m/s²)(10 m) = 500 kg m²/s² = 500 Joule

2. Chinthu cholemera makilogalamu awiri chimayenda pamalo osalala opingasa ndi liwiro la 2 m/s. Ngati liwiro lomaliza la chinthucho ndi 5 m/s. Kodi ntchito yochitidwa pa chinthucho ndi yotani?

Zodziwika:

Kulemera kwa chinthu (m) = 2 kg

Liwiro loyambirira (v)_o) = 2 m/s

Liwiro lomaliza (v)_t) = 5 m/s

SE basi: Ntchito yochitidwa pa chinthucho

Yankho:

The mfundo ya mphamvu ya ntchito-kinetic amanena kuti ntchito yogwirira ntchito pa chinthu ndi yofanana ndi kusintha kwa chinthucho mphamvu zamagetsi.

W = ΔKE = KE₂ – KWA₁ = 1/2 mv_t² – 1/2 mv_o² = 1/2 m (v)_t² -v_o²) = 1/2 (2)(5²-2²) = (1)(25-4) = 21 Joule

3. Chinthu cholemera makilogalamu 10 poyamba chili pansi posalala. Pambuyo pochikankhira m'masekondi atatu, chinthucho chinathamanga pa 2 m/s²Kodi ntchito yochitidwa pa chinthucho ndi yotani?

Zodziwika:

Kulemera (m) = 10 kg

Liwiro loyambirira (v)_o) = 0 (poyamba atapumula)

Nthawi yopuma (t) = masekondi 3

Kuthamanga (a) = 2 m/s²

Akufuna: Ntchito (W)

Yankho:

Choyamba, dziwani mtunda pogwiritsa ntchito equation ya kuthamanga kosalekeza kuyenda.

d = v_o t + ½ pa² = (0)(3) + ½ (2)(3)²

d = 0 + (1)(9) = 9

Ntchito yochitidwa pa chinthucho:

W = F s = (ma)(d) = (10)(2)(9) = 180 Joules

4. Chipika chokhala ndi kulemera kwa 1.5 kg chimapita patsogolo ndi mphamvu yosasintha F = 15 N pamalo opendekeka monga momwe chithunzi chili pansipa chikusonyezera. Kuthamanga chifukwa cha mphamvu yokoka ndi 10 m/s² ndipo palibe kukangana pakati pa mabuloko ndi ndege yopendekeraKodi ntchito ya ukonde yochitidwa pa chinthucho ndi yotani?

Zodziwika:

Kulemera kwa chipika (m) = 1.5 kg

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

Kulemera kwa chipika (w) = mg = (1.5)(10) = 15 Newtons

Mphamvu (F) = 15 Newton

SE basi: Ntchito yapaintaneti yachitika pa chinthucho

Yankho:

Pali mphamvu ziwiri zomwe zimagwira ntchito pa boloko. Choyamba, mphamvu yofanana ndi kusamuka kwa boloko yomwe ndi Mphamvu F. Chachiwiri, gawo lopingasa la kulemera kwa boloko (w)_x).

Ntchito yochitidwa ndi mphamvu (F):

W₁ = F s = (15 N)(2 m) = 30 N m = 30 Joules

Ntchito yochitidwa ndi gawo lopingasa la kulemera (w)_x):

W₂ = w_x s = (w sin 30^o)(2 m) = (15 N)(1/2)(2 m) = 15 N m = 15 Joules

Ntchito ya netiweki yochitidwa pa chinthucho:

W_ukonde =W₁ - W₂ = 30 J – 15 J = 15 Joule

1. Kodi chiphunzitso cha mphamvu ya ntchito ndi chiyani pankhani ya ntchito ya neti ndi mphamvu ya kinetic?
   • yankhoChiphunzitso cha mphamvu ya ntchito chimanena kuti ntchito yonse yochitidwa pa chinthu ndi yofanana ndi kusintha kwa mphamvu yake ya kinetic. Wnet​=ΔKE.
2. Ngati mukweza chinthu pamalo enaake kenako n’kuchigwira pamenepo, kodi mumagwira ntchito yochuluka bwanji pa chinthucho pamene mukuchigwira mosasunthika?
   • yankho: Mukagwira chinthucho mosasunthika, simukugwira ntchito iliyonse chifukwa palibe kusuntha. Ntchito imatanthauzidwa ngati mphamvu yomwe imasinthasintha nthawi yosuntha kupita ku mphamvu, kotero kusuntha kumatanthauza kuti palibe ntchito.
3. Kodi mphamvu yokoka ya chinthu pansi pa nthaka ndi yotani?
   • yankhoMphamvu yokoka ya chinthu chomwe chili pansi nthawi zambiri imaonedwa kuti ndi zero. Mphamvu yokoka ndi yofanana, ndipo pansi ndi malo odziwika bwino.
4. Kodi mphamvu ya kinetic ya chinthu imasintha bwanji ngati liwiro lake lawirikiza kawiri?
   • yankho: Mphamvu ya kinetic imafanana ndi liwiro lalikulu. Ngati liwiro la chinthu lawirikiza kawiri, mphamvu yake ya kinetic idzawonjezeka ndi factor ya zinayi.
5. Kodi mphamvu yokoka ya chinthu chogwa imakhala yochuluka bwanji?
   • yankhoMphamvu yokoka ya chinthu chogwa imakhala yayikulu kwambiri chisanayambe kugwa, mwachitsanzo, chikakhala pamalo ake okwera kwambiri pamwamba pa nthaka (kapena malo ofotokozera).
6. Ngati palibe kukana kwa mpweya, kodi tinganene chiyani za ubale pakati pa mphamvu zomwe zingatayike ndi mphamvu ya kinetic yomwe imapezeka ndi chinthu chomwe chimagwa momasuka?
   • yankho: Ngati palibe kukana kwa mpweya, mphamvu yomwe ingatayike ndi chinthu chomwe chimagwa momasuka idzakhala yofanana ndi mphamvu ya kinetic yomwe imapeza. Izi ndi zotsatira zachindunji za kusunga mphamvu ya makina.
7. Kodi chimachitika ndi chiyani ku mphamvu yokoka ya chinthu ngati chakwezedwa kufika pa msinkhu wake woyambirira kuwirikiza kawiri kuposa nthaka?
   • yankhoMphamvu yokoka imafanana ndi kutalika. Ngati chinthu chakwezedwa kufika pa msinkhu wake woyamba kawiri, mphamvu yokoka imawirikiza kawiri.
8. Kodi ntchito ya netiweki imachitika liti pa chinthu chomwe chili zero?
   • yankho: Ntchito yonse yochitidwa pa chinthu ndi zero pamene ntchito yonse yochitidwa ndi mphamvu zonse zomwe zikugwira ntchito pa chinthucho ifika pa zero, kapena mofananamo, pamene palibe kusintha kwa mphamvu ya kayendedwe ka chinthucho.
9. Ngati chinthu chikuyenda pa liwiro losasinthasintha, kodi tinganene chiyani za ntchito ya ukonde yomwe yachitika pa icho pa mtunda winawake?
   • yankhoNgati chinthu chikuyenda pa liwiro losasintha, zikutanthauza kuti palibe kuthamanga, motero palibe mphamvu yogwira ntchito pa icho. Chifukwa chake, ntchito yogwira ntchito pa chinthucho pa mtunda uliwonse idzakhala zero.

10. N’chifukwa chiyani chinthu chomwe chili pamalo okwera kwambiri chimakhala ndi mphamvu yokoka ngakhale kuti chili kutali ndi pakati pa Dziko Lapansi?

    • yankho: Mphamvu yokoka imachokera pamalo a chinthu poyerekeza ndi malo ofotokozera (nthawi zambiri pamwamba pa Dziko Lapansi) ndi mphamvu yokoka yomwe imagwira ntchito pa icho. Chinthu chomwe chili pamalo okwera kwambiri chimakhala chokwera kuposa malo ofotokozera awa, zomwe zikutanthauza kuti chasuntha motsutsana ndi mphamvu yokoka kupita pamalo amenewo. Zotsatira zake, chimakhala ndi mphamvu yosunga chifukwa cha malo ake, ndipo mphamvu yosungidwa iyi ndi mphamvu yake yokoka.