MIDTERM Science: IB Flashcards
What is a mechanical property?
Definition
A mechanical property describes how a material will react when its is subjected to one or more mechanical constraints.
List the types of mechanical properties?
Types!
- Hardness
- Elasticity
- Resilience
- Ductility
- Malleability
- Tensile strength
What does hardness refer to?
Define
Resists penetration
What does elasticity refer to?
Define
Returns to original shape.
What does resilience refer to?
Definition
Resists physical impacts.
What does ductility refer to?
Definition
Stretches without breaking.
What dos malleability refer to?
Definiton
Flattens or bends without breaking.
What does tensile strength refer to?
Definition
Resists tension
What is a mechanical constraint?
Definition
A mechanical constraint describes the stress produced within a material when it is subjected to one or more external forces. Mechanical constraints produce various efforts inside a material.
List the 5 principle mechanical constraints:
List
- Compression
- Tension
- Torsion
- Bending
- Shearing
What is compression?
Define
Force that crushes materials.
What is tension?
Define
Force that streches materials.
What is torsion?
Define
Force that twists materials.
What is bending?
Definition
Force that bends materials
What is shearing?
Definition
A force that cuts/tears materials.
What are the mechanical properties of wood?
List
- Hardness
- Elasticity
- Resilience
- Tensile strength
What are the mechanical propeties of metals?
List
- Good conductors of electricity
- Good conductors of heat
- Malleable
- Ductile
- High melting point
Name the 3 types of projections:
List
- Isometric
- Multi-view
- Exploded view
What is an isometric view?
Define
- A 3-D representation of an object placed so that 3 sides are visble
- Visible sides are usually: Front, Top, and Side
- Visual lines in isometric projections are perpendicular to the paper.
What is a multi-view projection?
Define
- 2-D representation of a every view of an object
- Views: front, right, top (can also be bottem, back, and left)
- Mugshot views
- Must be consistent throughout and line-up
What is exploded view?
Define
Shows various parts of an object seperated from eachother.
Name the types of lines
List
- Object line
- Hidden line
- Dimension line
- Extension line
- Diameter
- Center line
What is an object line?
Define
Indicates the visible outlines of an object.
- Thick and continous
What is a hidden line?
Define
Indicates the outlines that are’t visible in the current view.
- Medium and broken