Dickson E. G

Objects that produce their own light are known as luminous objects i.e. the sun, torch lamps etc. objects that do not produce their own light are called non-luminous objects i.e. the moon. Opaque objects are those which do not allow…

Heat is transferred in matter through the following methods: conduction, convection and radiation. Conduction This is the transfer of heat in solids. The rate of conduction depends on Amount of temperature – the higher the temperature the higher the rate…

Pressure is defined as the force acting normally (perpendicularly) per unit area . The SI units for pressure is newton per metre squared (N/m2). One Nm-2 is known as one Pascal (Pa). Pressure = normal force / area or pressure =…

Temperature is the degree of hotness or coldness of a body. Both Celsius scale (0C) and Kelvin scale (thermodynamic scale) are used to measure temperature. The Kelvin scale is also known as the absolute scale temperature and is measured from…

Science in our lives Scientists are people trained in science and who practice the knowledge of science. We require people in industries to work as engineers, technicians, researchers, in hospitals as doctors, nurses and technologists. Science gives us powerful ideas,…

MOTION Types of motion: (a) random motion (b) Translational motion  (c). Rotational motion  (d). Oscillatory motion  (e). relative motion Causes and effects of motion. Types of Motion Definition of motion: Motion by definition is a change in the position of…

CIRCULAR MOTION 1. Meaning of circular motion Definition of terms Angular velocity ii. Tangential velocity iii. Centripetal acceleration Centripetal force v.  Centrifugal force  vi.  Period  vii. Frequency Calculations on circular motion. Meaning of circular motion Circular motion is the motion…

MOTION 1. Force Types of forces. Friction and types. Calculations on friction. Advantages and disadvantages of friction. Ways of reducing friction. Force and the types, Friction and types Force can be defined as that which changes or tends to change…

MEASUREMENT IN PHYSICS Measurement of area and volume Concept & measurement of time and ways of measuring time. MEASUREMENT OF VOLUME Volume of liquid objects is measured using instruments such as cylinder, burette, pipette, eureka can, etc. For regular solid…

Concept of position, Concept of distance and displacement Distinction between distance and displacement. CONCEPT OF POSITION The position of an object is its location in space. It is usually expressed in relation to a reference point. To locate an object…

MEASUREMENT IN PHYSICS (CONT) Measurement of area and volume Concept & measurement of time and ways of measuring time. MEASUREMENT OF VOLUME Volume of liquid objects is measured using instruments such as cylinder, burette, pipette, eureka can, etc. For regular…

FUNDAMENTAL QUANTITIES AND UNITS Fundamental quantities: mass, length, time and electric charge Simple measurement of current and temperature. CONCEPT OF FUNDAMENTAL QUANTITIES Fundamental quantities are physical quantities whose dimensions and units are not usually derived from other physical quantities. Basically,…

Measurement of length Measurement of mass & weight MEASUREMENT OF LENGTH/DISTANCE Length is measured using the following instruments. (a). Metre Rule: A metre rule is a measuring device calibrated in centimetres (cm) with a range of 0 – 100cm. In…

Definition & Importance of Physics. Aspects/Career in Physics. Branches of physics. DEFINITION OF PHYSICS The word ‘’PHYSICS’’ originates from the Greek word, ‘’PHYSIS’’, which means nature and natural characteristics. Physics as a body of scientific knowledge, deals with the study…

X-rays were discovered by a German scientist named Roentgen in 1985. They can pass through most substances including soft tissues of the body but not through bones and most metals. They were named X-rays meaning ‘unknown rays’. X-ray production They…

What is cathode rays?. These are streams of electrons emitted at the cathode of an evacuated tube containing an anode and a cathode. Production of cathode rays They are produced by a set up called a discharge tube where a…

Sources of mains electricity Mains electricity comes from a power station and its current is the alternating current which can either be stepped up or down by a transformer.  A.c is produced when a conductor is rotated in a magnetic…

What is a Len?.  A lens is conventionally defined as a piece of glass which is used to focus or change the direction of a beam of light passing through it. They are mainly made of glass or plastic. Lens are…

Properties of waves Waves exhibit various properties which can be conveniently demonstrated using the ripple tank. It consists of a transparent tray filled with water and a white screen as the bottom. On top we have a source of light.…

Energy This is the ability to do work. Forms of energy. Chemical energy: – this is found in foods, oils charcoal firewood etc. Mechanical energy:- there are two types; Potential energy – a body possesses potential energy due to its relative…