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2.17 Om die aantrekkingskrag van ‘n magneet op magnetiese sowel as

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Natuurwetenskappe

Energie-oordrag en kragte

Opvoeders afdeling

Memorandum

(a) Wat neem jy waar?: Die skuifspeld beweeg ook opwaarts en bly hang in die lug onder die magneet.

Wat gebeur?: Die skuifspeld val terug op die bank.

(b) Wat gebeur?: Die skuifspeld behou sy posisie in die lug.

Gevolgtrekking: Magnete kan magnetiese stowwe deur nie-magnetiese stowwe aantrek, maar nie deur magnetiese stowwe nie.

Verklaring: ‘n Tinblikkie word van yster, bedek met ‘n dun lagie tin, vervaardig.

Leerder afdeling

Inhoud

Aktiwiteit: om die aantrekkingskrag van ‘n magneet op magnetiese sowel as nie-magnetiese stowwe te ondersoek [lu 2.3]

(a) Maak ‘n skuifspeld aan ‘n garingdraad vas en monteer die ander punt van die garingdraad met behulp van wondergom op jou bank. Hou ‘n staafmagneet ‘n entjie bo die skuifspeld en lig die magneet op.

Wat neem jy waar? _________________________________________________

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Hou nou die deksel van ‘n tinblikkie tussen die magneet en die skuifspeld.

Onthou, daar moet geen kontak tussen die voorwerpe wees nie.

Wat gebeur? __________________________________________________________

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(b) Herhaal wat julle in 4(a) gedoen het, maar hou nou ‘n vel papier tussen die magneet en die skuifspeld.

Wat gebeur? __________________________________________________________

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Watter gevolgtrekking kan julle maak?_____________________________________

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  • Onthou, die papier is ‘n nie-magnetiese stof en die tindeksel is ‘n magnetiese stof.
  • Probeer verklaar waarom ‘n tinblikkie magneties is, maar nie tin op sy eie nie.

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5. ‘n Magneetveld

‘n Magneet word deur ‘n magneetveld omring. Dit is ‘n gebied in die ruimte rondom ‘n magneet waarin ‘n magneet ‘n krag uitoefen. Die aarde moet dus omring wees deur ‘n magneetveld en dit beteken ook dat ons almal in ‘n magneetveld lewe! Wat sou ons ondervind het indien die aarde nie deur ‘n magneetveld omring was nie?

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Ons gaan nou die magneetveld van ‘n staafmagneet met behulp van ystervylsels ondersoek.

Assessering

Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder inligting interpreteer, bv.: interpreteer inligting deur kernidees in die teks te identifiseer, patrone in aangetekende data te vind en gevolgtrekkings te maak uit inligting in verskeie vorme (bv. prente, diagramme en geskrewe teks).

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Source:  OpenStax, Natuurwetenskappe graad 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
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