Si Units Flashcards
What are the 6 base quantities
Mass
Length
Time
Current (I)
Temperature
Amount of substance (n)
What is the 6 base units
Kilogram
Metres
Seconds
Amps
Kelvin ( k)
Mole
What is the prefix called that is 10^12
Terra
Prefix - 10^9
Giga
Prefix - 10^6
Mega
Prefix - 10^3
Kilo
Prefix - 10^-3
Milli
Prefix - 10^-6
Micro
Prefix - 10^-9
Nano
Prefix - 10^-12
Picko
Prefix- 10^-15
Femto
Write 1,000,000 HZ using prefix
1 MHz
Write 0.004 V using prefix
4 mV
How to turn a 0.000007A into prefix
Turn into standard form then pick the prefix that matches and write together
Sf- 7 * 10^-6
The prefix for 10^-6 is micro
Answer= 7 mA
How many meters per second are there in km per hour
3.6
How many watts ar 1 joule
1
Express work done in si based units
1- find work done equation
Work done = force * distance / displacement
Displacement = m ,force = N (what they measured in)
Newton is not an si unit so you have to do the equation for force to get si base units
2- force equation
F = m a
Mass= kg , acceleration = ms^-2
3- now combine
Answer= kgm^2s^-2
What unit is ms
Millisecond
Turn 100 pics seconds into seconds
100 * 10^-12
= 10*10^-10
Conver 34 m^2 to cm^2
340000
How many micro metered in a centimetre
10,000
What does the area under an acceleration + time graph represent
Velocity (ms^-1)
what is the area under a force x meter graph
energy (j)
how do you know what SF to use when rounding an answer
add the same SF as the smallest number of data
