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Module 2 - Phyics B1 > 2.2.1 - Mechanics (Statics) > Flashcards

2.2.1 - Mechanics (Statics) Flashcards

1
Q

What is the SI unit for mass?

A

the kilogram (kg) or slug

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2
Q

What is 1 slug in kg?

A

1 slug = 14.59kg

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3
Q

What is 1lb in N?

A

1lb = 4.448N

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4
Q

What is the difference between mass and weight?

A

An object’s mass is a quantity of matter making it up; which will never change.
An object’s weight is a measure of the gravitational force exerted on it (which changes depending where it is in the universe)

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5
Q

What is the formula for weight?

A

W = mg

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6
Q

What is 2.2lbs in kg?

A

2.2lbs = 1 kg

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7
Q

What is 1kW equal to in BTU?

A

3412 BTU/Hour

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8
Q

What is the numerical value for gravitational force?

A

9.8

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9
Q

What is the equation for moment?

A

Moment = Force x distance

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10
Q

What does the sum of clockwise moments equal?

A

The sum of anticlockwise moments

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11
Q

What is a couple?

A

A pair of forces acting in equal but opposite directions (eg, a steering wheel)

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12
Q

What is Sin(90)?

A

1

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13
Q

What is the equation for torque?

A

t=F x d x sin(ϴ)

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14
Q

How do you calculate the scale reading on a torque wrench when using an extension?

A

Scale reading = Specified torque x (length/length + extension)

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15
Q

What is a Centroid?

A

The centre of mass of an object.

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16
Q

What are the three aircraft weighing methods?

A
  • Weighbridge Scales
  • Hydrostatic Weighing Units
  • Electronic Weighing Equipment
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17
Q

How many readings should be made when weighing an aircraft?

A

2

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18
Q

What are the two categories of quantities in physics?

A

Vectors and Scalars

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19
Q

What is a vector?

A

A quantity that is fully described by both magnitude and direction

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20
Q

What is a scalar?

A

A quantity that is fully described by magnitude alone

21
Q

What is strain?

A

A measure of the deformation of a material under a load. The ratio of the amount of deformation to it’s original size.

22
Q

What are the two primary structural stresses?

A

Tension and Compression

23
Q

What is tension?

A

A primary stress that tries to pull a body apart (a weight on a chain)

24
Q

What is compression?

A

A primary stress that tries to squeeze parts together (a weight on a post)

25
Q

What is shear?

A

Forces that try to slide a body apart.

26
Q

What is torsion?

A

A twisting force. Tensile stress acts diagonally across a structural member that is twisted.

27
Q

What is bending?

A

A bending force tries to pull one side of a body apart while at the same time squeezes the other side together.

28
Q

What is the formula for stress?

A

Stress = Force/Area

29
Q

What is Hooke’s Law?

A

F=Ke
(K being the spring constant)
(e is the extention)

30
Q

What is the elastic limit?

A

Where Hooke’s Law does not apply. It is known as the limit of proportionality.
Permanent deformation occurs after this limit.

31
Q

What is the formula for strain?

A

Strain = Deformation/Original length

32
Q

What is the Bulk Modulus?

A

It gives the change in volume of a solid substance as the pressure on it is changed.

33
Q

What is Poisson’s Ratio?

A

The ratio of transverse strain to the axial strain.

When a member is stressed in tension, it’s length increases (axial strain) and it’s width decreases (transverse strain).

34
Q

What is the equation for density?

A

Density = Mass / Volume

35
Q

What is the equation for pressure?

A

Pressure = Force / Area

36
Q

What is 1Pa?

A

A Pascal (1N of force on 1M^2).
1/100,000Bar (incredibly low pressure)

37
Q

What is an Isobar?

A

A line on a weather map joining together places of equal atmospheric pressure.

38
Q

What is Pascal’s Law?

A

Any force applied to a contained fluid is transmitted in all directions throughout the fluid and at right angles to the containing surfaces.

39
Q

What is the formula for the pressure on an object submerged in a fluid?

A

P = pgh

40
Q

What happens to pressure with increasing depth in a fluid?

A

It increases

41
Q

What is Archimedes’ Principle?

A

A body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid

42
Q

What is the formula for Pressure on an object submerged in a fluid?

A

Pressure = p (rho) x g x h
(rho is density of fluid)

43
Q

What is the formula for the volume of a sphere?

A

V = 4/3 pi x r^3

44
Q

The unit of Young’s module are that of…

A

Pressure

45
Q

What is the height of mercury required to give 1 bar?

A

760mm (1 bar is almost atmospheric pressure)

46
Q

For the CGS (centimetre-gram-second) system, what is the force?

A

The ‘Dyne’ - which produces an acceleration of 1cm/s^2 for a mass of gram

47
Q

What is the opposite of a tensile force?

A

Compression (tension is to be pulled apart)

48
Q

What is the difference between a tied gyro and an earth gyro?

A

Both are free to rotate in 3 axis, both have a fixed point but an Earth gyro is specifically ‘tied’ to an earth reference point

49
Q

What is the coefficient of limiting friction?

A

The point at which an applied force overcomes friction and an object begins to move

Module 2 - Phyics B1 (6 decks)

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