Classify materials based on how they look (lustrous/non-lustrous) and how they feel (hard/soft).
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Highlight that hardness is relative.
Hook about shiny objects.
"All that glitters is not gold!" goes an old saying. Think about a brand new steel spoon and a piece of dry wood. If you place them side by side, how do they look different? How do they feel differently when you touch them?
Define lustrous/non-lustrous and hard/soft.
Materials that have a shiny surface are said to have a lustrous appearance. Metals like iron, copper, and gold are naturally lustrous. However, metals can sometimes lose their shine and look dull due to exposure to air and moisture.
Materials without a shiny surface are called non-lustrous. Common examples include paper, wood, rubber, and jute.
Visual showing lustrous vs non-lustrous and hard vs soft.
Visualizing lustrous vs. non-lustrous, and soft vs. hard materials.
Flashcards for Lustrous, Non-lustrous, Hard, Soft.
Matching exercise for materials and their properties.
Terms
Definitions