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# Physical quantities and units pps

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Cambridge As/A level Physics
prepared by Ferry Tanoto
for Central International School students.

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Statistics
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### Physical quantities and units pps

1. 1. Physical Quantities and Units<br />As/A Level Physics @ferrytanoto<br />
2. 2. Physical Quantity<br />Is a feature of something which can be measured, e.g. length, weight, or time of fall.<br />Every physical quantity has a numerical value (magnitude) and a unit, <br />e.g. 25 m is the physical quantity of length; 25 is the magnitude and metre is the unit.<br />
3. 3. Prefix<br />
4. 4. Unit Conversion for Areas and Volumes<br />Length<br />1 mm = 10-3m<br />Areas<br />Squaring both sides 1 mm2 = (10-3)2 m2 = 10-6 m2<br />Volume<br />Cubing both sides 1 mm3 = (10-3)3 m3 = 10-9 m3<br />
5. 5. Base Units<br />
6. 6. Derived Units consists of some combination of the base units. The base units may be multiplied together or divided by one another, but never added or subtracted<br />
7. 7. Derived Units<br />
8. 8. In any equation where each term has the same base units, the equation is said to be homogeneous or ‘balanced’.<br />
9. 9. A quantity which can be described fully by giving its magnitudeis known as a scalar quantity. A vector quantity has magnitudeand direction.<br />
10. 10. Scalar and Vector Quantities<br />
11. 11. Vector Representation<br />One way to represent a vector is by means of an arrow. The directionof the arrow is the directionof the vector quantity. The lengthof the arrow, drawn to scale, represents its magnitude. <br />
12. 12. Addition of Vectors<br />The combined effect of two (or more) vectors is called the resultant.<br />Coplanar (all in the same plane) vectors may be added (or subtracted) using a vector diagram.<br />The resultant may be found using a scale drawing of the vector diagram of by calculation.<br />
13. 13. Resolution of Vectors<br />A single vector may be divided into two separate components.<br />The dividing of a vector into components is known as the resolution of the vector.<br />In general, a vector is resolved into two components at right-angles to each other.<br />
14. 14. Sine rule<br />
15. 15. Cosine rule<br />
16. 16. Pythagoras’ Theorem<br />Hypotenuse2 = Opposite2 + Adjacent2<br />