Physic Lesson 1

8/7/2019 Physic Lesson 1

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Introduction

Kinematics is the research regarding the types of movement of an obj ect without referring to the

forces that cause the movement of the object.

Movement along a straight line i s called linear movement.

Distance and Displacement

Distance Displacement

DefinitionThe distance traveled by an object isthe total length that is traveled by thatobject.

Displacement of an object from a point of reference, O isthe shortest distance of the object from point O in aspecific direction.

SI unit meter (m) meter (m)

Quantity Scalar Vector



Ex ample 1

Distance

In the diagram above, the distance of point B from the origin O is 100m. The distance of

point A from the origin O is also 100m. Distance is a scalar quantity. Therefore we don't need

to tell the direction of point A and B from the reference point, O.

Displacement

In the diagram above, the displacement of point B from the origin O is +100m, whereas the

displacement of point A from the origin O is -100m. The + and ± sign show the direction of the

displacement. Displacement is a vector quantity. Therefore we need to tell the direction of point A and

B from O.

Ex ample 2

Adli go to work by motorcycle everyday as shown in the diagram above. The distance

traveled by an object is the total length that is traveled by that object. The distance that Adli

travels from his house to the factory is 200m.

Displacement of an object from a point of reference, O is the shortest distance of the object

from point O in a specific direction. The displacement of Adli from his house after arriving at

the factory is 120m.



S peed and Velocity

S peed

S peed is the rate of change in distance. In other words, it is how fast the distance change in 1 unit

of time.In mathematics, displacement can be calculated from the following formula:

Unit: ms -1

Type of quantity: S calar quantity

V elocity

Velocity is the rate of change in displacement. It is how fast the displacement change in 1 unit of

time.

Formula:

Unit: ms -1

Type of quantity: Vector quantity



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Equ aitons for Uniform Acceleration

The above equation is for solving numerical problems involving uniform acceleration.

S u mmary of the Equ ation



Nega ti $ e acce lerati % & not necessary mean dece lera tion!Some time, it mean t ' e ob ject mov ing in t ' e oppos itedirec tion.

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Distance is def ined as t 6 e total pat 6 trave led by an

ob ject from one po int to t 6 e ot 6 er.

D i 0 7 l 2 4 5 8 5 3 1

Displacemen t is def ined as t 6 e shor test distance

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o po int in a spec if ic d irection.

@ 7 5 5 d

Speed is def ined as the ra te of change of d istance.

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Ve locity is def ined as the ra te of change of

displacemen t.

A 4 4 5 l 5 r 2 1 i A 3

Acce leration is def ined as the ra te of change of

velocity.

Dece le r 2 1 i A 3

Dece leration is the ra te of decrease of ve locity or

how fas t a ve locity of a mov ing ob ject decreases.

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Physic Lesson 1