unit 2: physical properties, prefixes, s.i. units Flashcards

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1
Q

strength

A

ability to support a heavy load without changing shape permanently/ breaking

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2
Q

hardness

A

ability to resist being scratched?
ability to scratch another material

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3
Q

flexibility

A

ability to bend without breaking and return to its original shape

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4
Q

melting/boiling point

A

temperature at which material changes from solid to liquid/liquid to gas

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5
Q

electrical conductivity

A

measure of how early an electric current passes through it

metals have good electrical conductivity while non-metals have poor electrical conductivity

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6
Q

thermal conductivity

A

measure of how easily heat passes through

metals have good thermal conductivity while non-metals have poor thermal conductivity

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7
Q

density

A

amount of matter an object had in proportion to its volume

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8
Q

prefix: mega (state the symbol and index notation?)

A

M (1 000 000 or 10^6)

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9
Q

prefix: kilo (state the symbol and index notation?)

A

k (1000 or 10^3)

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10
Q

prefix: deci (state the symbol and index notation?)

A

d (1/10 or 10^-1 or 0.1)

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11
Q

prefix:centi (state the symbol and index notation?)

A

c (1/100 or 10^-2 or 0.01)

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12
Q

prefix: milli (state the symbol and index notation?)

A

m (1/1 000 or 10^-3 or 0.0001)

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13
Q

prefix: micro (state the symbol and index notation?)

A

idk how to type the sign: upside down h? or u with a line

1/ 1 000 000 or 10^-6 or 0.0000001

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14
Q

properties of metals?

A

malleable, ductile, sonorous, shiny appearance, good electrical and thermal conductivity

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15
Q

properties of non-metals?

A

brittle, not sonorous, dull appearance, poor electrical and thermal conductivity

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16
Q

s.i unit for length?

A

metre, symbol: m

17
Q

s.i. unit for mass?

A

kilogram, symbol: Kg

18
Q

s.i. unit for time?

A

second, symbol: s

19
Q

s.i. unit for electric current?

A

ampere, symbol: A

20
Q

s.i. unit for temperature?

A

kelvin, symbol: K

21
Q

how to calculate density?

A

mass per unit volume

density = mass/volume

22
Q

when are s.f. and d.p. used?

A

d.p. for ‘+’ and ‘-‘
d.p. for average
s.f. for ‘x’ and ‘÷’

23
Q

what can digital calipers measure? + what is the scale of them?

A

outside jaws measure external diameter
inside jaws measure internal diameter
tail measures depth
the scale is in ‘mm’