Physical Properties
Hardness: The resistance a material offers to ________
Penetration or scratching
Elasticity is: The extent to which a material will return to ___ after being deformed.
it's original shape
Shape memory alloys are ______ that when deformed, can spring back into its original shape once released.
Metals
What are Physical Properties?
Any property that is measurable that describes a state of a material.
Which of the following best describes the essential properties of copper needed for wire drawing?
1. Elasticity
2. Ductility
3. Malleability
Ductility
What is thermoelectricity?
This refers to a smart material that when heated can produce an electric current.
The cables of a suspension bridge, such as the Golden Gate Bridge, must support enormous loads without snapping. Their ability to withstand pulling forces without breaking is due to their ______
Tensile Strength
Name 2 mechanical properties of a chair.
1. Toughness
2. Compressive Strength
When a ________ material is deformed, it gives off a small electrical discharge. When an electric current is passed through it, it increases in size (up to a 4% change in volume).
Piezoelectric
All matter is made up of four general properties. What are these properties?
1. Mass
2. Weight
3. Volume
4. Density
What is the equation to calculate stress?
The force on a material / The cross-sectional area
What are SMART materials?
Materials that have been designed to have one or more properties that can be modified when subject to an external stimuli in a way that the output can be controlled.
Railway gaps are used to serve what purpose?
Enables thermal expansion
Define Young's Modulus & give the equation.
Measures the stiffness of an elastic material.
Stress/Strain
One of the most popular applications is for colour-changing sunglass lenses, which can darken as the sun brightens.
What is this physical property called?
Photochromicity