Imibuzo emi-3 mayelana ne-Impulse equation
1. Imoto enesisindo esingama-250 kg ihamba ngesivinini esingama-72 km/ihora, bese isheshiswa ngamandla angaguquki ukuze ngemizuzwana emi-5 ijubane layo libe ngama-80 km/ihora. Thola i-pulse imizuzwana emi-5.
Kwaziwa:
Isisindo semoto (m) = 250 kg
Isivinini sokuqala (v o ) = 72 km/h = 20 m/s
Isivinini sokugcina (v t ) = 80 km/h = 22 m/s
Isikhawu sesikhathi (t) = imizuzwana eyi-5
Okufunwayo: Nquma ukushukuma (I)
Isixazululo:
Ifomula yomfutho: Umfutho = Ushintsho kumfutho
I = Δp
I = m (v t – vo o ) = (250)(22 – 20) = (250)(2)
I = 500 kg m/s
2. Into enesisindo esingu-0.4 kg ekuqaleni ehamba ngesivinini esingu-20 m/s imiswa amandla angaguquki angu-50 N ngesikhathi esithile. Ingakanani i-pulse?
Kwaziwa :
Isisindo (m) = 0.4 kg
Ijubane (v o ) = 20 m/s
Ijubane lokugcina (v t ) = 0 m/s
Amandla (F) = 50 N
Okufunwayo: Impulse (I)
Isixazululo:
Ifomula yomfutho: Umfutho = Ushintsho kumfutho
I = Δp
I = m (v t – vo o ) = (0,4)(0 – 20) = (0,4)(-20)
I = 8 kg m/s
3. Into enesisindo u-m ihamba ngesivinini esingaguquki u-v, ngakho-ke i-pulse yento…
Isixazululo
Umfutho = ushintsho kumfutho. Umfutho uyashintsha lapho isisindo noma ijubane lishintsha. Ngakho-ke uma isivinini kanye nomfutho kungaguquki khona-ke akukho shintsho kumfutho. Ukuze kungabikho mfutho.
