Zusammenfassung der Ressource
Foundations of Physics
- International System of Units (SI)
- Developed so that scientists all
around the world could work
with one system of
measurements
- Base Quantities
- One of the 7 fundamental
physical quantities that can be
used to describe all other
quantities
- Mass
- Length
- Time
- Current
- Amount of Substance
- Temperature
- Luminosity
- Base Units
- The units of base
quantities
- Kilogram (kg)
Anmerkungen:
- Metres (m)
Anmerkungen:
- Seconds (s)
Anmerkungen:
- Amperes (A)
Anmerkungen:
- Mole (mol)
Anmerkungen:
- Kelvin (K)
Anmerkungen:
- Candela (cd)
Anmerkungen:
- Derived Quantity
- A quantity
derived from a
combination of
base quantities
- Force
- Pressure
- Charge
- Power
- Voltage
- Energy
- Frequency
- Others (see
note)
Anmerkungen:
- Area
Volume
Density
Velocity
Acceleration
Work
- Derived Unit
- Units of
derived
quantities
- Newton (N)
Anmerkungen:
- Force
Can be written as kgms^-2
- Pascal (Pa)
Anmerkungen:
- Pressure
Can be written as m^-1kgs^-2
- Coulomb (C)
Anmerkungen:
- Charge
Can be written as sA
- Watts (W)
Anmerkungen:
- Power
Can be written as m^2kgs^-3
- Volts (V)
Anmerkungen:
- Volts
Can be written as m^2kgs^-3A^-1
- Joules (J)
Anmerkungen:
- Energy
Can be written as kgm^2s^-2
- Hertz (Hz)
Anmerkungen:
- Frequency
Can be written as s^-1
- Others (see note)
Anmerkungen:
- m^2 (Area)
m^3 (Volume)
kgm^-3 (Density)
ms^-1 (Velocity)
kgms^'1 (Momentum)
ms^-2 (Acceleration)
kgm^2s^-2 (Work)
- Prefixes
- Smaller
- Pico
- x10^-12
- Nano
- x10^-9
- Micro
- x10^-6
- Milli
- x10^-3
- Centi
- x10^-2
- Deci
- x10^-1
- Bigger
- Mega
- x10^6
- Kilo
- x10^3
- Giga
- x10^9
- Tera
- x10^12
- Uncertainty
- Percentage uncertainty = (absolute uncertainty /
average measurement) x 100
- If you are multiplying
or dividing quantities,
the total percentage
uncertainty is the
sum of each
percentage
uncertainty
- Percentage Difference
- ((accepted value - measured value) / accepted value) x 100
- Graphs
- Straight line graphs
- y = mx + c
- m (gradient) = change in y / change in x
- c is the y intercept when x=0