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Wood Physics and Mechanics > Assessment > Flashcards

Assessment Flashcards

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1
Q

a point when all water is evaporated from cell cavities but the cell walls are still fully saturated with moisture

A

Fiber Saturation Point

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2
Q

wood that is usually associated with high lumber strength and stiffness has a ________

A

high density

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3
Q

example of wood with high density

A
  • kamagong
  • molave
  • apitong
  • narra
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4
Q

a surface shrinkage experiences a greatest amount of movement in _________ section

A

tangential

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5
Q

the quality of wood that changes in size or in its physical property according to the direction in which it is being measured

A

anisotropy

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6
Q

theory of the physical and mechanical properties of wood and wood based materials

A

wood physics

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7
Q

a condition by which the moisture content of the wood is balanced with that of the atmospheric moisture condition

A

equilibrium moisture content

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8
Q

good indicator of the amount of wood substances in a given block of wood

A

density

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9
Q

it is a solid material from trees or shrubs

A

wood

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10
Q

the ability of wood to lose and absorb water

A

hygroscopicity

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11
Q

increased in wood dimension and volume as it gains moisture below FSP, expressed in percent

A

swelling

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12
Q

formula of %MC

A

%MC= (Wg- Wo/ Wo) 100

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13
Q

it is the increment of wood added during a single growth period

A

growth rings

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14
Q

in drying process, it is the first to be removed but the last to fill up the pores when the wood absorbs water or moisture

A

free water

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15
Q

it significantly affects the physical properties of wood as it leads to decrease in hardness and stiffness

A

water

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16
Q

the acceptable moisture levels of wood and lumber range from ___________ for interior and 9-14% for exterior

A

6-9%

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17
Q

one reason why tangential shrinkage is higher compared to radial shrinkage is because of ___________ that can limit how much wood shrinks in the radial direction

A

rays or wood rays

18
Q

formula of longitudinal shrinkage

A

%LS= (Li- Lf/Li) 100

19
Q

defined as the weight of the oven-dry wood divided by the weight of an equal volume of water

A

specific gravity

20
Q

ratio of moderately high specific gravity in wood

A

0.601 to .700

21
Q

in computing specific gravity of wood, what do we always put as a denominator

A

volume of wood

22
Q

symbol of density

A

p

23
Q

in determining specific gravity for a quick assessment but less accurate, what method are you going to use?

A

flotation method

24
Q

what does density of water equivalent to pounds per cubic foot?

A

62.4 ft cube

25
Q

what doesn’t have destructive effect on wood but more accurate and precise when it comes to determining specific gravity?

A

x-ray densiometry method

26
Q

this principle state that a body wholly or partly submerges in a fluid experiences an upward buoyant force equal to the weight of the water displaced

A

Archimedes

27
Q

what do we call downward force

A

gravitational force

28
Q

defines as to keep afloat

A

buoy

29
Q

formula of buoyant force

A

fb = wf- wa

30
Q

what will happen if the buoyant force is less than the objects weight?

A

the object sinks

31
Q

factors affecting buoyancy

A
  • density of water
  • volume of water displace
  • local acceleration due to gravity
32
Q

T/F: browne principle states that a body submerged in a fluid experiences an upward buoyant force equal to the weight of the water displaced

A

false - browne - ARCHIMEDES

33
Q

T/F: an upward force is also called buoyancy

A

true

34
Q

T/F: displacement happens when any object enters water

A

true

35
Q

T/F: cork and iron has a positively buoyant while watermelon is neutrally buoyant

A

false - iron - WOOD

36
Q

T/F: ships float in water because of the weight of the floating object (ship) that is equal to the gravitational force

A

false - gravitational - BUOYANT

37
Q

T/F: a medium specific gravity has a ratio of .501 to .600

A

true

38
Q

T/F: woods with lower specific gravity tend to hold paint better than those with higher specific gravity

A

true

39
Q

T/F: density is unitless

A

false - density - SPECIFIC GRAVITY

40
Q

T/F: the density of water with a temperature of 40C or 39F is commonly used as reference to compute SG.

A

false - 40 - 4C

41
Q

T/F: if wood has a specific gravity of 1.00, it means its density equals that of water

A

true

Wood Physics and Mechanics (12 decks)

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