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Wood Physics and Mechanics > Finals_Assessment > Flashcards

Finals_Assessment Flashcards

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1
Q

What do we call the study of how moving objects behave and its causes?

A

DYNAMICS

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2
Q

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

A

FIRE TETRAHEDRON

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3
Q

What do we call the center of the fire tetrahedron that occur during combustion that allows fire to continue burning?

A

Chemical Reaction

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4
Q

What process in which heat is transferred from a solid
surface to a non-solid, such as air and water?

A

CONVECTION

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5
Q

Identify the 2 factors affecting heat capacity of wood.

A

a. TEMPERATURE
b. MOISTURE CONTENT

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6
Q

It is defined as the ratio of thermal conductivity to the
product of density and heat capacity.

A

THERMAL DIFFUSIVITY OF WOOD

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7
Q

A branch of physics that studies how energy changes in a system.

A

THERMODYNAMICS

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8
Q

Identify the four essential thermal properties of wood.

A

a. THERMAL CONDUCTIVITY
b. HEAT CAPACITY
c. THERMAL DIFFUSIVITY
d. COEFFICIENT OF THERMAL EXPANSION

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9
Q

What do we call the term that was named after Alexander
Graham Bell that used to measure sounds?

A

DECIBEL

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10
Q

What types of wood are generally better at absorbing sounds?

A

SOFTWOODS

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11
Q

What is the ability of wood to absorb and prevent reflections of sounds?

A

ACOUSTIC PROPERTY

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12
Q

Which is more soundproof, concrete or wood?

A

CONCRETE

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13
Q

It is the smallest particle that makes up an atom and they carry a negative charge.

A

ELECTRONS

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14
Q

The electrical properties of wood depend mostly on ___________.

A

MOISTURE CONTENT

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15
Q

Dielectric Constant is also known as?

A

RELATIVE PERMITIVITY

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16
Q

What movement of electricity frequently reverses in direction?

A

ALTERNATING CURRENT

17
Q

Molecules that have gained or lost electrons.

A

IONIZED WATER MOLECULE

18
Q

What are the factors affecting electrical properties of wood?

A

a. MOISTURE CONTENT
b. TEMPERATURE
c. GRAIN DIRECTION
d. WOOD TYPE

19
Q

Stress and strain are two basic terms one encounters in the study of mechanics

A

True

20
Q

Wood’s stiffness, or modulus of elasticity, indicates how much it deforms under an applied load

A

True

21
Q

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.

A

False
Physics- MECHANICS

22
Q

Shear stress causes the portion of wood to move or slide in parallel but in opposite direction

A

True

23
Q

Stress referred to as the change in length per unit of length in the direction of stress

A

False
Stress- STRAIN

24
Q

Ss = P/A i s the basic formula in computing stress?

A

True

25
Q

Modulus of rupture is the ability of the wood to recover its original size or shape after the applied load is removed

A

False
Rupture - Elasticity

26
Q

The strength of the wood is its ability to resist the applied stress

A

True

27
Q

The tensile strength of a material is an important property that indicates its ability to withstand tensile stress without failing or deforming permanently

A

True

28
Q

If the applied force tends to shorten or to compress the wood, the force is acting in tension

A

False
Tension - COMPRESSION

29
Q

What is the source of strength in solid wood?

A

Wood Fiber

30
Q

What do we called the bending caused by a load?

A

Deflection

31
Q

It is the ability of the wood to preserve its original size and shape

A

Stiffness

32
Q

What is the hardest wood in the world with a JHT of 2,295 kg?

A

Australian Buloke

33
Q

Janka hardness test is use to measure the resistance of sample of wood to denting and wear. Where does Janka came from?

A

Austrian-born American wood researcher Gabriel Janka

34
Q

This is a strength of wood that resist twisting in the longitudinal axis

A

Torsion Strength

35
Q

It is a scale that used in testing hardness of wood

A

Nanometer Scale

36
Q

It is the ability of the wood to resist from splitting?

A

Cleavage

Wood Physics and Mechanics (12 decks)

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