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PHYSICS > MEASUREMENTS > Flashcards

MEASUREMENTS Flashcards

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1
Q

what is a physical quantity

A

a quantity that can be measured and consists of a numerical magnitude and a unit

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2
Q

what are the 2 types of physical quantities

A

base and derived

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3
Q

what are all the base quantities

A

length, mass, time, electric current, thermo temp, amt of substance

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4
Q

whats the si unit and symbol for length

A

metre and m

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5
Q

what is the si unit and symbol of mass

A

kilogram and kg

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6
Q

what is the si unit and symbol of time

A

second and s

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7
Q

what is the si unit and symbol for electric current

A

ampere and A

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8
Q

what is the si unit and symbol for thermo temp

A

kelvin and K

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9
Q

what is the si unit and symbol of amt of substance

A

mole and mol

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10
Q

prefix ladder going from up to down

A

giga 10 3
mega 10 6
kilo 10 9
deci 10 -1
centi 10-2
milli 10-3
micro 10-6
nano 10-9

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11
Q

when ur going up the prefix ladder most dp to left or right

A

left

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12
Q

when ur going down the prefix ladder most dp to left or right

A

right

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13
Q

what is a scalar quantity

A

it is a physical quantity that have magnitude only

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14
Q

what is a vector quantity

A

it is a physical quantity that have both magnitude and direction

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15
Q

examples of a scalar quantity

A

distance, temperature and speed

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16
Q

examples of a vector quantity

A

displacement, velocity and acceleration

17
Q

what is a precision

A

the smallest unit that the instrument can measure

18
Q

precision of a metre ruler

A

0.1cm

19
Q

precision of a digital calipers

A

0.01cm

20
Q

precision of a digital micrometer screw gauge is

A

0.01mm

21
Q

precision of a stop watch is

A

0.01s

22
Q

what is a period

A

a time taken for one complete oscillation

23
Q

is the period dependent on the length of the pendulum

A

yes

24
Q

is the period dependent on the mass of the pendulum bob

A

no

25
Q

convert from prefix to base unit

A

eg. 76km to m
use the first one for the power

26
Q

convert base unit to prefix

A

eg. 76m to km
use the second one for the power

27
Q

convert a prefix with another

A

add both of the powers

28
Q

convert a prefix to a derived quantity

A

get the first power than if its square x2 and cube x3

29
Q

convert km/h to m/s

A

1200/3600

30
Q

convert g/cm3 to km/m3

A

x 1000

PHYSICS (5 decks)

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