2 Foundations of Physics Flashcards
1
Q
What are SI units?
A
Fundamental (base) units of physical quantities
2
Q
What is the SI unit of mass?
A
Kilogram - kg
3
Q
What physical quantity is measured in mol?
A
Amount of substance
4
Q
What is the SI unit of current?
A
Amperes (A)
5
Q
Is the SI unit for temperature °C or K?
A
K (kelvin) as this is the absolute scale
6
Q
What is the SI unit of length?
A
Meters - m
7
Q
What quantity is measured in seconds?
A
Time
8
Q
Are Newtons (N) an SI unit?
A
No, Newtons are not fundamental, the SI units for force are kgms^-2 (since F=ma)
9
Q
Derive the SI units of energy
A
Kinetic energy = 1/2 mass x velocity^2
Units = kg x (m/s)^2 = kg m^2 s^2
10
Q
Derive the SI units of force
A
Force = mass x acceleration Units = kg x m s^-2 = kg m s^-2
11
Q
What is T?
A
tera (10^12)
