CIE AS & A Level Physics 9702: Topic 1: Physical quantities and units- Unit : 1.1 Physical quantities Study Notes

Quantitative versus qualitative

• Most observation in physics are quantitative
• Descriptive observations (or qualitative) are usually imprecise

Qualitative Observations

How do you measure artistic beauty?         


Quantitative Observations

What can be measured with the instruments on an aeroplane?

• A physical quantity is one that can be measured and consists of a magnitude and unit.

Are classified into two types:
• Base quantities
• Derived quantities

Base quantity
For example : is likethe brick – the basic building block of a house

Derived quantity
For example : is like the house that was build up from a collection of bricks (basic quantity)

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