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Physics > Statics > Flashcards

Statics Flashcards

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1
Q

Equation of moment

And units

A

Moment = Force x perpendicular distance

Units : Nm

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2
Q

The principle of moment

A

The sum of clockwise moments is equal to the sum of anti-clockwise moments about a given point

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3
Q

What is a couple?

A

Two PARALLEL forces of equal magnitude but in opposite directions

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4
Q

What is a scalar quantity?

A

A quantity with only magnitude

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5
Q

What is a vector quantity?

A

Quantities with magnitude AND direction

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6
Q

Types of stress

A 
Tensile
Compressive
Torsion
Shear
Bending
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7
Q

What is the equation for stress?

Units?

A

Stress = Force/Area

Units: N/m^2 or Pa

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8
Q

What is the equation for strain?

Units?

A

Strain = deformation / original length

Units : NO UNITS

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9
Q

What is the equation for youngs modulus?

Units?

A

Youngs Modulus = Stress/ Strain

Units : N/ m^2 or Pa

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10
Q

What does Hooke’s Law state?

A

Stress is directly proportional to strain

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11
Q

What does a higher youngs modulus mean?

A

Substance is stronger

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12
Q

What is another name for the linear region?

A

Elastic region

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13
Q

What is the bulk modulus?

A

The bulk modulus gives the changes in volume of a substance as the pressure on it is changed

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14
Q

Bulk modulus equation and units

A

Bulk modulus = Pressure/ Volumetric Strain

Units : N/m^2 or Pa

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15
Q

When a plane is in flight, where would the tensile and compressive stress be located?
When the plane is stationary?

A

Tensile on the bottom, compressive on the top. - in flight

Tensile on top, compressive on the bottom. - stationary

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16
Q

Properties of a solid?

A 
Toughness
Hardness
Ductility
Brittleness
Plasticity
Elasticity
Malleability
17
Q

Properties of a liquid and gas

A 
Vapor
Volatile
Flammable
Flash point
Toxicity
Inert
18
Q

What is toughness?

A

Ability to resist breakage when deforming or impact forces are applied to it

19
Q

Hardness

A

The resistance a substance has to indentation or to any action tending to penetrate its surface

20
Q

Malleability

A

Can be beaten, rolled or pressed into a shape without fracturing

21
Q

Brittleness

A

Can break with little or no change of shape

22
Q

Ductility

A

Can be stretched into new shape without breaking and can keep its new shape after the force is removed

23
Q

Plasticity

A

The ability to be readily forced into a different shape permanently without fracture

24
Q

Elasticity

A

The ability to return to its original shape after the distorting force is removed

25
Q

Vapor

A

Ability for a gas to be liquified by an increase in pressure without a decrease in temperature

26
Q

Volatile

A

A liquids ability to readily evaporate at normal temperature

27
Q

Flammable

A

The ability to catch fire easily

28
Q

Flash point

A

Flashpoint of a combustible liquid is the temperature it has to be before it will catch fire to a naked flame

29
Q

Toxicity

A

How poisonous the substance is

30
Q

Inert

A

Inability to chemically combine with another substance

31
Q

Pressure (solids) equation

Units?

A

Pressure = Force/ Area

Units : Pa or N/m^2

32
Q

What does the Archemides Principle state?

A

When an object is submerged in a liquid, the object displaces a volume of liquid equal to its volume and is supoorted by a force equal ti the weight of the liquid displaced

33
Q

What is the normal force in a liquid called?

A

buoyant force

34
Q

Volume displaced equation

A

Volume of object x % submerged

35
Q

How much is submerged equation as a percentage

A

Density (block)/ density(water) x100

36
Q

What methods can be used to add vectors?

A

Triangle and parallelogram methods

37
Q

What is the meaning of the center of gravity?

A

The point which the weight of a body may be considered to act

38
Q

What is the proportional limit?

A

Maximum stress and strain the material can withstand before deformation

39
Q

What is Poisson’s ratio?

A

The ratio of the proportional decrease in a lateral measurement to the proportional increase in length in a sample of a material that is elastically stretched

Physics (6 decks)

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