2. Foundations of Physics

Question 1

Define what a physical quantity is

Answer 1

A physical quantity is a property of an object that can be measured

Physical quantities have a numerical value (or magnitude), and a unit.

For example, length - measured in m

Question 2

Describe two properties most physical quantities have

Answer 2

• A numerical value (aka magnitude)
• A unit

Question 3

What is one important thing to note about some physical quantites?

Answer 3

Some physical quantities do not have or need a unit.

For example, proton number or magnification

Question 4

However,

What are S.I. Units?

Answer 4

S.I. (known as Système Internationale) units are the 7 fundamental base units of the base physical quantities of which every other unit can be derived