phys chapter 1 physical quantities Flashcards
(17 cards)
What is the SI unit of length?
metre (m)
What is the SI unit of mass?
kilogram (kg)
What is the SI unit of time?
seconds (s)
What is the SI unit of electric current?
Ampere (A)
What is the SI unit of temperature?
Kelvin (K)
What are the seven base quantities?
time, length, mass, temperature, amount of substance, electric current and luminous intensity
Give examples of derived quantities.
Speed (m/s), area (m^2), volume (m^3)
List the prefixes and factors for SI units in order from largest to smallest.
multiples: Tera (10^12), Giga (10^9), Mega (10^6), Kilo (10^3)
sub-multiples: deci (10^-1), centi (10^-2), mili (10^-3), micro (10^-6), nano (10^-9)
How do you minimise random errors?
Random errors are unpredictable and cluster around a mean value. Taking several readings and calculating the average minimises them.
What are systematic errors?
Systematic errors are constant and predictable. These can be avoided by
calibrating the equipment.
What is the precision and measuring range of a measuring tape?
0.1 cm, measures from zero to several metres.
What is the precision and measuring range of a metre rule?
0.1 cm, measures from zero to one metre.
What is the precision and measuring range of a digital caliper?
0.001 cm, measures from zero to 15 cm.
What is the precision and measuring range of a digital micrometer screw gauge?
0.0001 cm, measures from zero to 2.5 cm.
What is the difference between vector and scalar quantities?
scalar quantities have magnitude only while vector quantities have both magnitude and direction.
Give examples of scalar quantities.
distance, speed, mass, energy, time
Give examples of vector quantities.
displacement, velocity, acceleration, force, weight
