__1.1 Physical Quantities and Units__Physical quantity is defined as a quantity which can be measured.

It can be categorized into 2 types

Basic (base) quantity

Derived quantity

Basic quantity is defined as a quantity which cannot be derived

from any physical quantities.

__1.2 Scalars and Vectors__Scalar quantity is defined as a quantity with magnitude only.

e.g. mass, time, temperature, pressure, electric current,

work, energy and etc.

Mathematics operational : ordinary algebra

Vector quantity quantity is defined as a is defined as a quantity with both magnitude quantity with both magnitude

& direction.

e.g. displacement, velocity, acceleration, force, momentum,

electric field, magnetic field and etc.

Mathematics operational : vector algebra

__CHAPTER 2:Kinematics of Linear Motion__

*Linear motion – motion of an object along a*

*straight line path.*

*Distance, d*

*-- the total length of travel in moving from one*

*location to another.*

*-- scalar quantity.*

*-- always positive.*

Displacement, s

-- straight line distance from the initial

position to the final position of an object.

-- Vector quantity

-- can be positive, negative or zero

*Speed, v*

*-- Rate of change in distance*

*-- S.I. unit : m s*

*–1 ; scalar quantity*

*Average Speed, ( v)*

*-- total distance traveled divided by the total*

*time elapsed in traveling that distance*

*Velocity, v*

*-- tells us how fast object is moving & in which*

*direction it is moving*

*-- is the rate of change in displacement.*

*-- vector quantity ;*

*SI unit : m s*

*–1*

*-- Deceleration : object is slowing down (direction*

*of acceleration is opposite to the direction of*

*the motion or velocity).*

*Average acceleration*

*-- change in velocity divided by the time taken*

*to make the change.*

*-- vector quantity.*

*-- SI unit : m s*

*–2*

*rearranged to give:*

*
***v = u + a t**

*… (1)*

*
*
Distance traveled, s = area under the graph

= area of trapezium

**s=1/2 (u+v)t**

*… (2)*
Substitute (1) into (2) :

s= (u+u+at )t

become

*s = ut +1/2 at^2 … (3)*t=(v-u)/a

Substitute into (2) :

=(v+u)(v-u)/2a

2as=v^2-u^2

*v^2 =u^2+ 2as … (4)*