3 ngā pātai mō te whārite Impulse
1. Kei te neke tētahi motuka he 250 kg te taumaha me te tere o te 72 km/haora, kātahi ka whakaterea ki te kaha pumau kia 80 km/haora te tere i roto i te 5 hēkona. Tātaihia te iri mō te 5 hēkona
Mōhiotia:
Ko te taumaha o te motuka (m) = 250 kg
Tere tīmatanga (v o ) = 72 km/h = 20 m/s
Tere whakamutunga (vt ) = 80 km/h = 22 m/s
Wā wā (t) = 5 hēkona
E hiahiatia ana: Whakatauhia te hihiri (I)
Rongoā:
Tātai hihiri: Hihiri = Huringa o te hihiri
I = Δp
I = m (vt – v o ) = (250)(22 – 20) = (250)(2)
I = 500 kg m/s
2. Ka aukatia tētahi mea he 0.4 kg te taumaha e neke ana i te tīmatanga me te tere o te 20 m/s e te kaha pumau o te 50 N i roto i tētahi wā kua whakaritea. E hia te rahi o te panapana?
Mōhiotia :
Taumaha (m) = 0.4 kg
Tere (v o ) = 20 m/s
Te tere whakamutunga (vt ) = 0 m/s
Te kaha (F) = 50 N
E hiahiatia ana: Te hihiri (I)
Rongoā:
Tātai hihiri: Hihiri = Huringa o te hihiri
I = Δp
I = m (vt – v₂o ) = (0,4)(0 – 20) = (0,4)(-20)
I = 8 kg m/s
3. Kei te neke tetahi mea he papatipu m tōna i te tere pumau v, nō reira ko te panapana o te mea he…
otinga
Te nekehanga = te huringa o te nekehanga. Ka huri te nekehanga ina huri te papatipu, te tere rānei. Nō reira, ki te pumau te tere me te papatipu, kāore he huringa o te nekehanga. Nō reira, kāore he nekehanga.
