Course Content
Theme 1. Matter
In classical physics and general chemistry, matter is any substance that has mass and takes up space by having volume.
Theme 3. Force
Theme 4. Simple Machines
Theme 5. Light & Shadows
Theme 6. Magnetism
ICSE Physics – 6
About Lesson


  • The observation of a phenomenon is made possible by using the five senses: sight, smell, touch, hearing and taste. 
  • Our senses are not always reliable. They are subjective. 
  • Sometimes it is necessary to make an exact measurement. 
  • Physics is a science of measurement. 
  • We use instruments to get an exact measurement. 
  • Four basic measurements in our daily life are: measurement of length, measurement of mass, measurement of time, and measurement of temperature. 
  • Measurement is basically a process of comparison of the given quantity with a standard unit. 
  • For measuring a quantity we need a unit, and then we find the number of times that unit is contained in that quantity. 
  • The unit selected for measurement should be of a convenient size and it must not change ‘with place or time. 
  • The distance between two fixed points is called length. 
  • The S.I. unit of length is metre (m). Its multiple is kilometre (km), where 1 km = 1000 m. Its sub multiples are centimetre (cm) and millimetre (mm), where 1 cm = 10-2 m and 1 mm = 10-3 m. 
  • The FPS unit of length is foot (ft) and its sub multiple is inch where 1 ft = 12 inch and 1 ft = 30.48 cm. 
  • The most common instruments used to measure length are the metre ruler and the measuring tape which are marked in cm and mm. 
  • To measure a length accurately with a metre ruler, the scale should be placed with its markings close to the object and parallel to its r length. The eye is kept in front of and in line with the reading to be taken. 
  • The quantity of matter contained in a body is called its mass. 
  • The S.I. unit of mass is kilogram (kg). Its multiples are quintal and metric tonne. 1 quintal = 100 kg and 1 metric tonne =10 quintal = 1000 kg. Its sub multiples are gram (g) and milligram (mg) where 1 g = 10 kg and lmg = 10-6 kg. 
  • The FPS unit of mass is pound (lb) where 1 lb = 453.59 g. 
  • Mass of a body is measured by using a beam balance or an electronic balance. 
  • The interval between two instances or events is called time. 
  • The S.l. unit of time is second (s), 1 s 1 / 86400 of a mean solar day. The C.G.S. and F.P.S. unit of time is also second (s). 
  • The multiple unit of time are minute (mm), hour (h), day and year where 1 min = 60 s, 1 h = 3600 s, 1 day = 86400 s and 1 year = 3.15 × 107 s. 
  • The time at any instant is recorded by a pendulum clock or watch and the time interval of an event is measured by using a stop watch or a stop clock. 
  • The temperature is the measure of degree of hotness or coldness of a body. 
  • The S.I. unit of temperature is kelvin (K), but the common unit of temperature is degree Celsius (°C) and degree Fahrenheit (°F). 
  • Doctors use a clinical thermometer to measure the patient’s body temperature. 
  • The normal temperature of a human body is 37°C or 98.6°E 
  • The total surface occupied by an object is called its area. Area is expressed as the product of measured length of two sides. 
  • The S.I. unit of area is square metre (m2). 
  • One square metre is the area of a square of each side one metre. 
  • The bigger (or multiple) units of area are dam2, hectare and square kilometre (km2), where 1 dam2=100 m2,1 hectare= 104 m2 and 1 km2 = 106 m
  • The smaller (or sub multiple) units of area are cm2 and mm2 where 1cm2 = 10– 4 m² and 1 mm² = 10-6