Finals_Assessment Flashcards
What do we call the study of how moving objects behave and its causes?
DYNAMICS
It is a visual representation of the four properties that must
be present for a fire to occur, w/ each property depicted as a different side of a pyramid
FIRE TETRAHEDRON
What do we call the center of the fire tetrahedron that occur during combustion that allows fire to continue burning?
Chemical Reaction
What process in which heat is transferred from a solid
surface to a non-solid, such as air and water?
CONVECTION
Identify the 2 factors affecting heat capacity of wood.
a. TEMPERATURE
b. MOISTURE CONTENT
It is defined as the ratio of thermal conductivity to the
product of density and heat capacity.
THERMAL DIFFUSIVITY OF WOOD
A branch of physics that studies how energy changes in a system.
THERMODYNAMICS
Identify the four essential thermal properties of wood.
a. THERMAL CONDUCTIVITY
b. HEAT CAPACITY
c. THERMAL DIFFUSIVITY
d. COEFFICIENT OF THERMAL EXPANSION
What do we call the term that was named after Alexander
Graham Bell that used to measure sounds?
DECIBEL
What types of wood are generally better at absorbing sounds?
SOFTWOODS
What is the ability of wood to absorb and prevent reflections of sounds?
ACOUSTIC PROPERTY
Which is more soundproof, concrete or wood?
CONCRETE
It is the smallest particle that makes up an atom and they carry a negative charge.
ELECTRONS
The electrical properties of wood depend mostly on ___________.
MOISTURE CONTENT
Dielectric Constant is also known as?
RELATIVE PERMITIVITY
What movement of electricity frequently reverses in direction?
ALTERNATING CURRENT
Molecules that have gained or lost electrons.
IONIZED WATER MOLECULE
What are the factors affecting electrical properties of wood?
a. MOISTURE CONTENT
b. TEMPERATURE
c. GRAIN DIRECTION
d. WOOD TYPE
Stress and strain are two basic terms one encounters in the study of mechanics
True
Wood’s stiffness, or modulus of elasticity, indicates how much it deforms under an applied load
True
Physics is a branch of science concerned with the behavior of physical bodies when subjected to forces or displacement, and the subsequent effects of the bodies on their environment.
False
Physics- MECHANICS
Shear stress causes the portion of wood to move or slide in parallel but in opposite direction
True
Stress referred to as the change in length per unit of length in the direction of stress
False
Stress- STRAIN
Ss = P/A i s the basic formula in computing stress?
True
Modulus of rupture is the ability of the wood to recover its original size or shape after the applied load is removed
False
Rupture - Elasticity
The strength of the wood is its ability to resist the applied stress
True
The tensile strength of a material is an important property that indicates its ability to withstand tensile stress without failing or deforming permanently
True
If the applied force tends to shorten or to compress the wood, the force is acting in tension
False
Tension - COMPRESSION
What is the source of strength in solid wood?
Wood Fiber
What do we called the bending caused by a load?
Deflection
It is the ability of the wood to preserve its original size and shape
Stiffness
What is the hardest wood in the world with a JHT of 2,295 kg?
Australian Buloke
Janka hardness test is use to measure the resistance of sample of wood to denting and wear. Where does Janka came from?
Austrian-born American wood researcher Gabriel Janka
This is a strength of wood that resist twisting in the longitudinal axis
Torsion Strength
It is a scale that used in testing hardness of wood
Nanometer Scale
It is the ability of the wood to resist from splitting?
Cleavage
