What are the main categories of materials used in engineering? - Metals, polymers, ceramics, and composites, Which property refers to the ability of a material to resist scratching, abrasion, and indentation? - Hardness, What property defines the temperature at which a substance changes from a solid to a liquid state? - Melting point, What property refers to the ability of a material to conduct heat? - Thermal conductivity, Which property determines the ability of a material to resist repeated stress cycles, bending, or tension? - Fatigue, What property refers to the ability of a material to resist shock or impacts and plastically deform without breaking? - Toughness, What property defines the opposition of a material to the flow of electric current? - Electrical resistivity, Which property refers to the ability of a material to resist forces without breaking, bending, or changing permanently? - Strength,

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