Assessment

Question 1

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

Answer 1

Fiber Saturation Point

Question 2

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

Answer 2

high density

Question 3

example of wood with high density

Answer 3

• kamagong
• molave
• apitong
• narra

Question 4

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

Answer 4

tangential

Question 5

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

Answer 5

anisotropy

Question 6

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

Answer 6

wood physics

Question 7

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

Answer 7

equilibrium moisture content

Question 8

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

Answer 8

density

Question 9

it is a solid material from trees or shrubs

Answer 9

wood

Question 10

the ability of wood to lose and absorb water

Answer 10

hygroscopicity

Question 11

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

Answer 11

swelling

Question 12

formula of %MC

Answer 12

%MC= (Wg- Wo/ Wo) 100

Question 13

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

Answer 13

growth rings

Question 14

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

Answer 14

free water

Question 15

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

Answer 15

water

Question 16

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

Answer 16

6-9%

Question 17

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

Answer 17

rays or wood rays

Question 18

formula of longitudinal shrinkage

Answer 18

%LS= (Li- Lf/Li) 100

Question 19

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

Answer 19

specific gravity

Question 20

ratio of moderately high specific gravity in wood

Answer 20

0.601 to .700

Question 21

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

Answer 21

volume of wood

Question 22

symbol of density

Answer 22

p

Question 23

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

Answer 23

flotation method

Question 24

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

Answer 24

62.4 ft cube

Question 25

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

Answer 25

x-ray densiometry method

Question 26

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

Answer 26

Archimedes

Question 27

what do we call downward force

Answer 27

gravitational force

Question 28

defines as to keep afloat

Answer 28

buoy

Question 29

formula of buoyant force

Answer 29

fb = wf- wa

Question 30

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

Answer 30

the object sinks

Question 31

factors affecting buoyancy

Answer 31

- density of water - volume of water displace - local acceleration due to gravity

Question 32

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

Answer 32

false - browne - ARCHIMEDES

Question 33

T/F: an upward force is also called buoyancy

Answer 33

true

Question 34

T/F: displacement happens when any object enters water

Answer 34

true

Question 35

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

Answer 35

false - iron - WOOD

Question 36

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

Answer 36

false - gravitational - BUOYANT

Question 37

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

Answer 37

true

Question 38

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

Answer 38

true

Question 39

T/F: density is unitless

Answer 39

false - density - SPECIFIC GRAVITY

Question 40

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

Answer 40

false - 40 - 4C

Question 41

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

Answer 41

true