Base Quantities
If Jared wants to measure how long it will take him to get to school he would use what base quantity?
Time
A nature documentary wants to measure how fast a cheetah runs. What derived quantity should they use?
speed
What is the quantity symbol for mass
m
What is length measured in?
metres
Unit symbol for mass
kg
David is trying to buy a new refrigerator to fit in his kitchen. What base unit should he use?
A student is wondering how many calories she needs to burn off a chocolate bar. What derived quantity are they measuring?
Energy or work
what is the quantity symbol for time versus temperature
t = time
T = temperature
What is electric current measured in?
amperes
Unit symbol for temperature
K
In a school experiment, the students are using a mounted 12 volt, 24 watt bulbs (car headlamp bulbs) and a 12 volt DC power supply. What base unit are they measuring?
electric current
A plastic manufacturer wants to know if their plastic is strong enough to hold certain products. What derived quantity should they use?
Force
what is the quantity symbol for luminous intensity?
Iv
How is speed measured
mètres per second
Unit symbol for luminous intensity
cd
A scientist wants to measure direct sunlight. What base quantity would she use?
luminous intensity
Andrea wants to figure out how much water fits in her pool. What Derived quantity should she use?
capacity
p
What is amount of substance measured in?
moles
Unit symbol for pressure
Pa
What is the amount of substance measuring?
a measure of the number of entities (atoms, molecules, ions, electrons, etc) present in a substance, expressed in moles.
What is the difference between capacity and volume?
Volume is how much space an object takes up
Capacity is the maximum amount of substance an object can hold.
What is the quantity symbol for volume versus speed?
volume = V
speed = v
what is energy measured in?
joules
Unit symbol for acceleration
m/s^2