chapter 1 Flashcards by Ainul Masyitah

Q

meaning physical quantities?

A

quantity that can be observed and measured

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Q

SI unit also know as?

A

metric system

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Q

2 category of physical quantities

A

base quantity ( fundamental quantity )
derived quantity

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Q

What is base quantity?

A

physical quantity that cannot be defined in terms of other physical quantity

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Q

Si unit length

A

meter , m

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Q

si unit mass

A

kg

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Q

si unit time

A

sec, s

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Q

si unit electric current,I

A

ampere A

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Q

si unit thermodynamic temperature T

A

Kelvin, K

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Q

si unit amount of substance,n

A

mole(mol)

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Q

si unit luminous intensity Iv

A

candela ( cd)

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Q

Meaning derived quantities?

A

quantity that can derived from base quantities

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Q

density formula

A

mass/vol
kgm-3

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Q

velocity unit

A

length/time
ms-1

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Q

momentum unit

A

mass x velocity

kgms-1

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Q

impulse unit

A

force x time
kgms-1

Q

acceleration unit

A

velocity/time
ms-2

Q

force unit

A

mass x acceleration
kgms-2
N

Q

pressure unit

A

force / area
Nm-2
Pa

Q

Stress unit

A

force / area
kgm-1s-2

Q

energy or work unit

A

kgm2s-2
J
force x length

Q

power unit

A

energy/time
W
Js-1

Q

how to get dimension of pysical quantity?

A

by comparing its derived quantity

Q

dimensionless example

A

L

deka power?

10 power 1 da

hecto power?

10 power 2 h

kilo power?

10 power 3 k

mega power?

10 power 6 M

giga power?

10 power 9 G

tera power?

10 power 12 T

peta power?

10 power 15 P

deci,d power?

10 power -1

centi, c power?

10^-2

mili,m power?

10^-3

micro power?

10^-6

nano,n power?

10^-9

pico,p power?

10^-12

femto,f power?

10^-15