Te whakamahinga o te tiakitanga o te pūngao miihini mō te nekehanga i runga i te papa piko – ngā raruraru me ngā otinga

1. Ka paheke iho tētahi poraka i runga i tētahi papa whakarara maeneene, kāore he waku . He aha te tere o te poraka ina pā ki te whenua? Ko te whakaterenga nā te kaha ā-papa he 10 m/ ^s²

Mōhiotia:

Teitei (h) = 8 m

Te whakaterenga nā te kaha ā-papa (g) = 10 m/s ²

E hiahiatia ana : tere (v)

Otinga :

Pūngao ā-pūkaha tīmatanga (ME _o ) = pūngao pūmanawa ā-papa (PE)

ME _o = PE = mgh = m (10)(8) = 80 m

Pūngao miihini whakamutunga (MEt ₎ = pūngao nekeneke (KE)

ME _t = KE = ½ mv ²

Ko te mātāpono o te tiaki i te pūngao ā-pūkaha e kī ana ko te pūngao ā-pūkaha tīmatanga = te pūngao ā-pūkaha whakamutunga:

ME _o = ME _t

80 m = ½ mv ²

80 = ½ v ²

160 = v ²

v = √160 = √(16)(10) = 4√10 m/s

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2. Ka paheke te mea 1-kg i raro i te 8 mita. Tātaihia te pūngao nekeneke i muri i te neke o te mea i runga i te 5 mita… Te whakaterenga nā te kaha ā-papatipu g = 10 m/s ²

Mōhiotia:

Taumaha (m) = 0.2 kg

d = 5 mita

Te whakaterenga nā te kaha ā-papa (g) = 10 m/s ²

E hiahiatia ana : pūngao nekeneke (KE)

Rongoā:

sin 30 ^o = h / d

0.5 = hāora / 5

h = (0.5)(5) = 2.5 mita

Ko te rerekētanga o te teitei o te mea he 2.5 mita.

Ko te pūngao ā-pūkaha tīmatanga (ME _o ) = te pūngao pūmanawa ā-papa (PE)

ME _o = PE = mgh = (1)(10)(2.5) = 25 Joule

Ko te pūngao miihini whakamutunga (ME _t ) = te pūngao nekeneke (KE)

ME _t = KE

Ko te mātāpono o te tiaki i te pūngao ā-pūkaha e kī ana ko te pūngao ā-pūkaha tīmatanga = te pūngao ā-pūkaha whakamutunga:

ME _o = ME _t

25 = KE

Pūngao nekeneke = 25 Joule.

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1. Ngā raruraru me ngā otinga mō te mahi i mahia mā te kaha
2. Ngā raruraru me ngā otinga mō te pūngao mahi-nekeneke
3. Ngā raruraru me ngā otinga o ngā mātāpono mahi-pūngao miihini
4. Ngā raruraru me ngā otinga o te pūngao pūmanawa ā-papa
5. Te pūngao pūmanawa o ngā raruraru me ngā otinga o te puna rapa
6. Ngā raruraru hiko me ngā otinga
7. Te whakamahinga o te tiakitanga o te pūngao miihini mō te nekehanga hinga noa
8. Te whakamahinga o te tiakitanga o te pūngao miihini mō te nekehanga ki runga, ki raro hoki i te nekehanga hinga noa.
9. Te whakamahinga o te tiakitanga o te pūngao miihini mō te nekehanga i runga i te mata piko
10. Te whakamahinga o te tiakitanga o te pūngao miihini mō te nekehanga i runga i te paparangi piko
11. Te whakamahinga o te tiaki i te pūngao miihini mō te nekehanga pere