Musimboti weSimba reKushanda-Kinetic

Musimboti weBasa-Kinetic Energy

Kana simba remagetsi rikashanda pachinhu, chinhu chinosangana nekukurumidzisa (chinhu chinosangana nekusuduruka). Kana chinhu chikasangana nekukurumidzisa, kumhanya kwechinhu kunochinja. Nemamwe mashoko, basa rinoitwa nesimba remagetsi rine chekuita nekukurumidzisa kwekutanga uye kwekupedzisira kwechinhu.

Basa rinoitwa pachinhu ne constant net force nderekuti:

W _net = ΣF s

Mutemo wechipiri waNewton unoti kana paine simba rinoshanda pachinhu, chinhu chacho chinokurumidzira.

W _net = (ma) s

Kana simba remagetsi risingachinji, kukurumidza kunoitika nechinhu chacho kunoramba kuchichinja. Saka, tinogona kutsiva equation yekufamba kwemagetsi isina kufanana panzvimbo yekukurumidza (a) uye displacement (s).

Musimboti weSimba reKushanda-Kinetic 1

Isa equation yekufamba kwemutsara isina kufanana mu equation yebasa:

Musimboti weSimba reKushanda-Kinetic 2

Tsananguro: EK _t = simba rekupedzisira rekinetic, EK _o = simba rekutanga rekinetic, m = uremu, v _t = kumhanya kwekupedzisira, v _o = kumhanya kwekutanga

Iyi equation inoumba work-kinetic energy theorem. Work-kinetic energy theorem inotiudza kuti net work kana basa rinoitwa nenet force pachinhu rakaenzana nekuchinja kwekinetic energy yechinhu. Inotiudzawo kuti kinetic energy yechinhu yakaenzana nenet work inodiwa kuti chinhu chikurumidze kubva panzvimbo isina kumira kuenda pakufamba nekumhanya kwakapihwa, uye zvinopesana.

Muenzaniso wemubvunzo wechi5: Dzidziso yesimba rekushanda-kinetic

Mota ine huremu hwe1000 kg inotama kubva panzvimbo isina kumira. Nenguva isipi, kumhanya kunowedzera kusvika 10 m/s. Basa remagetsi rinoitwa neinjini dzemota rakawanda sei?

Solution:

Inozivikanwa: m = 1000 kg, v _o = kumhanya kwekutanga = 0 m/s (pakutanga, mota inenge yasara), v _t = kumhanya kwekupedzisira = 10 m/s

Zvinodiwa: Network

W _mambure = 1⁄2 m (v _t² – v _o² )

W _net = 1⁄2 (1000)(10 ² – 0 ² ) = (500)(100 – 0) = (500)(100) = 50,000 Joules

1. Chii chinonzi Work-Kinetic Energy principle? Iyo $_{Work}$ -Kinetic Energy principle inoti basa rese rinoitwa pachinhu rakaenzana nekuchinja kwesimba rayo rekinetic. Pamasvomhu, $_{W} net_{=} Δ K E,$ apo $Δ K E$ ndiyo simba rekinetic rekupedzisira kunze kwesimba rekutanga rekinetic.

2. Basa rine chekuita sei nekuchinja kwespeed yechinhu? Basa rinoitwa pachinhu rinogona kuchinja kumhanya kwaro. Zvikuru sei, basa remambure rinoitwa pachinhu rakaenzana nekuchinja kwesimba rayo remambure, uye simba remambure rine chekuita nespeed yeskweya. Saka, kana basa remambure rakanaka rikaitwa pachinhu, kumhanya kwaro (uye nekudaro simba rayo remambure) kunowedzera.

3. Chii chinoitika kusimba remagetsi rechinhu kana basa remagetsi rikaitwa pachiri? Kana basa remagetsi rikaitwa pachinhu, simba rayo remagetsi rinoderera. Izvi zvinogona kukonzera kuti chinhu chiderere.

4. Mutemo weWork-Kinetic Energy une hukama hwakadii nemutemo wechipiri waNewton? Mutemo wechipiri waNewton unotsanangura kuti simba rinokanganisa sei kufamba kwechinhu, ukuwo mutemo weWork-Kinetic Energy unobatanidza basa rinoitwa nesimba iroro nekuchinja kwesimba rekinetic. Pfungwa dzese dziri mbiri dzakabatana nepfungwa yekuti masimba anogona kuchinja mamiriro ekufamba nesimba rechinhu.

5. Simba rekinetic rechinhu rinogona kuva negative here? Kwete, simba rekinetic rinogara risiri negative. Rinopihwa nefomura $K E = 1/2 m v^{2}$ , apo m iri mass uye v iri velocity. Sezvo mass ne square of velocity zviri zvakanaka, simba rekinetic ririwo positive kana zero.

6. Mutemo weWork-Kinetic Energy unoshanda sei kune chinhu chiri kufamba munzira yakatenderera? Kune chinhu chiri kufamba munzira yakatenderera nekumhanya kwakasimba, simba rayo rekufamba rinoramba riripo sezvo kumhanya kwaro kusina kuchinja. Zvisinei, kutungamira kwekukurumidza kwaro kunochinja nguva dzose. Kana masimba epakati (senge simba rekumanikidzwa kana simba regiravhiti) achishanda pane chinhu, basa rinoitwa nemasimba aya harisi zero sezvo achiita zvakatwasuka kune kutungamira kwekufamba. Saka, hapana basa remagetsi rinoitwa, uye hapana shanduko musimba rekufamba.

7. Kana pasina simba rekunze, simba rekufamba kwechinhu rinoshanduka sei? Kana pasina simba rekunze, hapana basa rinoitwa pachinhu chacho, zvinoreva kuti simba racho rekufamba kwechinhu rinoramba riripo. Uku kuratidzwa kwekuchengetedzwa kwesimba.

8. Zvinorevei kana basa remambure rinoitwa pachinhu riri zero? Kana basa remambure rinoitwa pachinhu riri zero, zvinoreva kuti simba remambure rechinhu harina kuchinja. Chinhu chacho chingave chichiri kufamba, asi kumhanya kwacho kunoramba kuripo.

9. Chinhu chinogona kuva nesimba rekufamba nemhepo here kunyangwe pasina basa rakaitwa pachiri? Ehe, chinhu chinogona kuva nesimba rekufamba nemhepo pasina basa rakaitwa pachiri munguva yakatarwa. Semuenzaniso, chinhu chiri kufamba nemhepo chiri muchadenga (kure nemiviri inokwevera pasi) chichachengetedza simba racho rekufamba nemhepo uye chicharamba chichifamba nekufamba kwakasimba, kunyangwe pasina simba rekunze rinoita pachiri.

10. Basa rinoitwa nemasimba asingachengetedzeki rinokanganisa sei simba rekufamba kwechinhu? Basa rinoitwa nemasimba asingachengetedzeki rinogona kuwedzera kana kuderedza simba rekufamba kwechinhu, zvichienderana negwara uye hukuru hwesimba rinoenderana nekufamba kwechinhu. Semuenzaniso, kukweshana, simba risingachengetedzeki, rinowanzoita basa rekusashanda zvakanaka, nokudaro richideredza simba rekufamba kwechinhu.