Summary Physics Form 4 KSSM Short notes

Chapter 1 Measurement
What is Physics?
Study of matter and energy.

What is Physics Quantities?
Quantity that can be measured by numerical value and unit.
(a)→ Base Quantities
Physical quantities that cannot be derived from in terms of other quantities.


Base Quantities Quantities Symbol SI Unit Symbol of SI unit

Length ℓ Metre m

Time t Seconds s

Mass m Kilogram kg

Temperature T Kelvin K

Electric current I Ampere A

Luminous intensity Iv Candela cd

Amount of n Mole mol
substances



→ Derived Quantities
Physical quantities that derived from combination base quantities through “ x or /” or both.

(b)→ Scalar Quantities
Have magnitude only
Ex: length, distance, speed


→ Vector Quantities
Have magnitude and direction
Ex: momentum, velocity, force, displacement

,Prefixes


+ x 10^ -

Exa,E 18 Atto,a

Peta,P 15 Fento,f

Tera,T 12 Pico,p

Giga,G 9 Nano,n

Mega,M 6 Micro,µ

Kilo,k 3 Milli,m

Hector,h 2 Centi,c

Deca,da 1 Deci,d

, Graph

Relation: y directly proportional to x.




Relation: y increases linearly to x.




Relation: y decreases linearly to x.