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Mechanical Science (GEN0003) > Units and Dimensons > Flashcards

Units and Dimensons Flashcards

1
Q

How many base quantities are there?

A

There are 7 base quantities

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2
Q

What are the base quantities?

A

Length
Mass
Time
Temperature
Elastic Current
Luminous Intensity
Amount of Substance \

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3
Q

What is a dimension?

A

It is the basic quantity (Like length)

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4
Q

What is dimension and Si Unit of Length?

A

L
Metre (m)

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5
Q

What is dimension and Si Unit of Mass

A

M
Kilogram (Kg)

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6
Q

What is dimension and Si Unit of Time

A

T
Seconds (s)

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7
Q

What is dimension and Si Unit of Temperature

A

K
Kelvin (K)

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8
Q

What is dimension and Si Unit of Electric Current

A

I
Ampere (A)

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9
Q

What is dimension and Si Unit of Luminous Intensity

A

J
Candela (cd)

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10
Q

What is dimension and Si Unit of Amount of Substance

A

N
mol (Moles)

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11
Q

What is dimension and Si Unit of Time

A

T
Time (s)

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12
Q

What are derived quantities?

A

Quantities that you get by multiplying the same or different base units

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13
Q

What are the derived units?

A

Area
Speed
Density
Force

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14
Q

What are the dimensions and Si unit of Area

A

L^2
m^2

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15
Q

What are the dimensions and Si unit of Speed

A

LT^-1
ms^-1

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16
Q

What are the dimensions and Si unit of Density

A

ML^-3
kg m^-3

17
Q

What are the dimensions and Si unit of Force

A

MLT^-2
kg m s^-2

18
Q

How much is a kilo

19
Q

How much is a Tera

A

1 TB= 10^12

20
Q

How much is a milli

A

1mm= 10^-3

21
Q

How much is a micro

A

1 us= 10^-6

22
Q

What is the rule of adding/subtracting quantities?

A

They must be of the same dimension and unit, if it isnt the same unit then standardize the units (Making them the same)

23
Q

What is the rule when multiplying/dividing quantities?

A

You can multiply quantities even if they have different dimensions however a new quantity is created with a new name

24
Q

What are dimensionless quantities

A

Quantities with no units. eg (Strain)

25
Q

What is dimensional analysis?

A

Checking if each quantity in an equation has the same dimensions, if they do not then the equation is not correct. It acts as an initial check.

26
Q

What is 1 litre to cm?

27
Q

Is this equation dimensionally correct?
-Force= density x area x velocity
-pressure = height × gravity acceleration × density
-power = speed × force
-energy = mass × (speed)2

28
Q

How to convert from Hours to Second

A

Multiply by 60 to get minutes then multiply again to get seconds

29
Q

How to convert from M to cm to mm

A

From M to cm you multiply by 100
From cm to mm multiply by 10

30
Q

How to convert between m/s to km/h

Mechanical Science (GEN0003) (3 decks)

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