COLLEGE DOCTRINA VITAE

PHYSICS SENIOR TWO O'LEVEL

PRESENTED BY JEAN BOSCO KUBWIMANAPHYSICS TEACHER,SCIENCES DptProduced by: JOHNNY

NDERA, 2010

COURSE CONTENT

TOPIC I:MECHANICS

CHAP I: Kinematics of rectilinear motionCHAPII: Dynamics of rectilinear motionCHAPIII:Work,Power and energy

TOPIC II: HEAT

CHAP IV: ThermometryCHAP V: Transmission of heatCHAP VI: Expansion of bodies

CHAP VII: Principles of heat exchange

CHAP VIII: Change of physical states

*Gazeous*Liquid

*Simple machines

TOPIC I:MECHANICSCHAP I: Kinematics of rectilinear

motion

INTRODUCTION AND DEFINITIONS

MEHANICS

Is a part of Physics which studies three main parts:KinematicsDynamicsStatics.

Kinematics studies motins without considering forces

In dynamics we study motions considering causes of motions:forces

In statics we also study motions of bodies at rest.

KEY WORDS

TrajectoryCoordinate system

Reference frameTraveled distance and displacement.

DIFFERENCE BTN DISTANCE AND DISPLACEMENT

The distance is the interval between two pts or lenght btn two points whereas displacement is the distance in a specified direction or the change in the position of the moving body. Both they share same unit (m).e.g The two moving car in opposite direction.

1. POSITION OF THE POINT IN THE CARTESIAN PLANE

The cartesian plane is asystem of two axes : vertical and horizontal axis. The coordinate

is a combination of two elements abscis and ordinate e.g:A(2,5),B(-3,8).

1.2 UNIFORM RECTILINEAR MOTION (URM)

A. Definition

URM is a motion on a straight line whose velocity is a constant.

e.g A car moving on a straight road.

A particle is an object which has mass but with negligeable size

DIFFERENCE BTN SCALAR AND VECTOR QUANTITIES

A scalar is any quantity described by only one thing:Magnitude A vector is a quantity described by only two things: Magnitude and direction.

The Position of a pt is therefore described by magnitude and direction.

e.g Distance is the scalar qtyDisplacement is the vector qty

C.AVERAGE SPEED AND VELOCITY

Av. Speed V=d/t[m/s],where d-distanceAv. Velocity V=displacement over

time.[m/s]

v

d

1.3.UNIFORMLY VARIED RECTILINEAR MOTION

ACCELERATION

Acceleration of the moving body is the change of its velocity per unit time denoted by 'a' and is expressed in m/s²

A body accelerates if its velocity increases and deccelerates if its velocity decreases.

UNIFORMLY VARIED RECTILINEAR MOTION

A motion is UVRM when its acceleration remains constant remains constant in time.

There two types :*Uniformly accelerated Rectilinear Motion

(UARM) whose acceleration is positive.*Uniformly decelerated Rectilinear Motion (UDRM),whose acceleration in negative.

CHAP 2:DYNAMICS OF RECTILINEAR

INTRODUCTION

Recall that dynamics is the part of physics which studies motions with their causes:forces.

KEY WORDS

*Inertia *Action*Reaction*momentum*Force

2.1 NEWTON'S LAWS OF MOTION

First law: PRINCIPLE OF INERTIA

Inertia is the reluctance( not willing to do something) of a body to start moving if

at rest or to stop moving if at rest.eg:Passengers in a moving vehicle

they can feel inertia.

STATEMENT OF THE LAW

CONT'D:FIRST LAW

“A body cn't change by itself its state of motion or rest if no force exerted on it”

SECOND LAW: FUNDAMENTAL RELATION OF DYNAMICS

If a force acts on a body whose mass m ,it communicate to the body an accelerationDenoted by “a ”

F=ma

Where F is the force applied to the body,m is the mass of the body and a is

the acceleration.

SPECIAL CASE

A body in free fall motion near the earth's surface under the force of gravity obeys

the Newton's 2nd law .

P=mg

THIRD LAW : ACTION AND REACTION

If a body A exerts a force F on the body B, then

the body B exerts on the bodyA equal and opposite force.

STATEMENT

“For every action ,there is an equal and opposite reaction”