Imibuzo emi-3 mayelana ne-equation yamandla ephumela
1. Imoto enesisindo esingamathani ama-5 isuka endaweni yokuphumula ngemizuzwana engama-50, ifinyelela isivinini esingamakhilomitha angama-72 ngehora. Amandla emotweni…
Kwaziwa:
Isisindo (m) = amathani ama-5 = 5000 kg
Isivinini sokuqala (vo) = 0
Isivinini sokugcina (vt) = 72 km/h = 20 m/s
Isikhawu sesikhathi (t) = imizuzwana eyi-50
Kufunwa: Amandla (F)
Isixazululo:
Bala ukusheshisa usebenzisa ifomula ethi Non Uniform Linear Motion:
v t = vo o + at
20 = 0 + a (50)
20 = 50 a
a = 20 / 50 = 0,4 m/s 2
Bala amandla aphumayo usebenzisa ifomula yomthetho wesibili kaNewton:
ΣF = ma
F = (5000)(0,4) = 2000 amaNewton
2. Imoto inesisindo esingange-ton eyodwa, imizuzwana emi-4 ijubane layo likhuphuka ngokulinganayo kusuka ku-10 m/s kuya ku-18 m/s. Thola ubukhulu bamandla asheshisa imoto.
Kwaziwa:
Isisindo semoto (m) = 1 ton = 1000 kg
Isikhawu sesikhathi (t) = imizuzwana eyi-4
Ijubane lokuqala (v o ) = 10 m/s
Ijubane lokugcina (v t ) = 18 m/s
Kufunwa: Amandla (F)
Isixazululo:
Bala ukusheshisa usebenzisa ifomula ethi Non Uniform Linear Motion:
v t = vo o + at
18 = 10 + a (4)
18 – 10 = a (4)
8 = 4 a
a = 8 / 4 = 2 m/s 2
Bala amandla aphumayo usebenzisa ifomula yomthetho wesibili kaNewton:
ΣF = ma
F = (1000)(2) = 2000 amaNewton
3. Amavektha amabili amandla aqondene nomunye nomunye okuholela kumphumela ongu-10 N. Uma enye yamavektha amandla ingu-6 N, nquma ubukhulu benye ivektha yamandla.
Kwaziwa:
Amandla aphumelayo (F) = 10 N
Amandla 1 (F 1 ) = 6 N
Okufunayo: Amandla 2 (F)2)
Isixazululo:
F2 = 10 – 6 = 4 Newton
