Section 4: Technology Flashcards
Name the mechanical properties of materials. Hint there are 6
hardness elasticity resilience ductility stiffness malleability
What is hardness?
the ability to resist indentation or abrasion
What is elasticity?
the ability to return to their original shapes after undergoing a constraint
What is resilience?
ability to take shocks without breaking
What is ductility?
ability to be stretched without breaking
what is malleability?
ability to be flattened or bent without breaking
What is stiffness?
ability to retain their shapes when subjected to various constraints
Name the 8 possible links. Hint think of them in pairs.
Direct- Indirect
Rigid-Flexible
Removable- Non-removeable
Complete-Partial
What is a direct link?
two parts hold together without a linking component
What is an indirect link?
the parts require a linking component to hold them together (screws, wires, glue)
What is a rigid link?
linking component or the surfaces of the linked parts are rigid
What is a flexible link?
linking component or the surfaces of the linked parts can be deformed (springs, rubber)
What is a removable link?
the linked parts can be separated without damaging either their surfaces or the linking component (nuts and screws are used in removable links)
What is a non-removeable link?
separating the linked parts damages their surfaces or the components
What is a complete link?
prevents the linked parts from moving independently of one another (bike wheel)
What is a partial link?
at least one part can move independently of the other parts (roller blade wheels)
Name the 3 types of guiding
translational, rotational, helical
What is translational guiding?
straight back and forth motion
What is rotational guiding?
ensures circular motion of a moving part
What is helical guiding?
ensures the translational motion of a moving part while it rotate about the same axis (rotates in a circle while moving up and down or back and forth)
Name 5 types of constraints
compression tension torsion deflection shearing
What is compression?
crushing forces
What is tension?
stretching forces
What is torsion?
twisting forces
What is deflection?
bending forces
What is shearing?
cutting forces
