MEASUREMENTS 1  KCSE PHYSICS NOTES, AUDIOVISUALS, OBJECTIVES, QUESTIONS, SCHEMES OF WORK AND ANSWERS
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SPECIFIC OBJECTIVES
By the end of the course, the learner should be able to:
TOPICS / SUBTOPICS OUTLINE:
MEASUREMENTS 1
In order to measure we need to know or define the quantity to be measured and the units for measuring it. In 1971 a system known as the International System of Units (Systeme’ Internationale) and seven basic units were agreed upon as follows. Other quantities can be obtained from these basic quantities and are referred to as derived quantities.
Length
This is the measure of distance between two points in space. The SI unit for length is the metre (m). Therefore;
Area
This is the measure of the extent of a surface. It is a derived quantity of length. Its SI units are square metres (m^{2}). Other units are cm^{2}, km^{2} etc. Formulas are used to determine areas of regular bodies while for irregular bodies an approximation of area is used.
Volume
This is the amount of space occupied by matter. The SI units for volume is cubic metre (m^{3}). Other submultiples are cm^{3}, mm^{3} and l. Hence 1 m^{3} = 1,000,000 cm^{3} and 1l= 1,000 cm^{3}. Volume can be measured using a measuring cylinder, eureka can, pipette, burette, volumetric flask, beaker, etc.
Mass
This is the quantity of matter contained in a substance. Matter is anything that occupies space and has weight. The SI unit for mass is the Kilogram (kg). Other submultiples used are grams (g), milligrams (mg) and tonnes (t). 1 kg = 1,000 g = 1,000,000 mg=100 tonnes. A beam balance is used to measure mass.
MEASUREMENT 1 QUESTIONS
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