1. Prepared By: Shakil Raiman

2.  There are two kinds of physical quantities  1. Base Physical Quantities  2. Derived Physical Quantities

3. Base Physical QuantitiesSI UnitsSymbol for Units Lengthmeterm Masskilogramkg Timeseconds CurrentAmpereA TemperatureKelvinK Amount of substancemolemol Luminous Intensitycandelacd

4. Derived Physical Quantities SI UnitsSymbol for Units Speed, Velocitymeter/secondms -1 Accelerationmeter/second 2 ms -2 Force, WeightnewtonN Volumemeter 3 or cm 3 m 3 or cm 3 Densitykilogram/meter 3 kgm -3 or gcm -3 Momentumkilogram-meter/secondkgms -1 Momentnewton-meterNm

5. Derived Physical Quantities SI UnitsSymbol for Units Work Done, EnergyJouleJ PowerWattW Pressurenewton/meter 2, PascalNm -2, Pa ChargeCoulombC Potential DifferenceVoltageV

6. PrefixSymbolExponent TeraT10 12 GigaG10 9 MegaM10 6 kilok10 3 Decid10 -1 Centic10 -2 Millim10 -3 Micro  10 -6 Nanon10 -12

7.  1 km = 1000 m  50 MW = 50 000 000 W  1 mm = 0.001 m  1 GHz = 1 000 000 000 Hz  32 GB = 32 000 000 000 B (approximately)

8. ScalarsVectors DefinitionA scalar is a quantity having magnitude (size) only A vector is a quantity having both magnitude and direction. OperationScalar can be added or subtracted simply Vectors can be added or subtracted graphically. Exampledistance, mass, length, time, volume, density, energy, speed, power, temperature etc. displacement, force, weight, moment etc.

9.  Scalar: Simple addition or substruction.  Example: 5kg + 3 kg = 8 kg  20 J + 60 J = 80 J  Vectors: Vector can be added to form a RESULTANT.  a. Simple algebraic addition when the vectors are parallel  Example: 5 N (right) + 15 N (right) = 20 N (right)  15 N (right) + 5 N (left) = 10 N (right)  b. Parallelogram addition when the vectors are not in the same straight line.  Example: 6 N acting East and 8 N acting West. So 10 N acting. Check on board.

10.  Wish you all very good luck and excellent result.