Physical Quantities Flashcards
What is the precision of a measuring tape
0.1cm or 1mm
What is Physics?
Physics is the study of our natural world — from the very large (e.g. the solar system) to the very small (e.g. the atom).
Who is known as the father of classical mechanics?
Sir Isaac Newton (1643–1727)
What discovery did Albert Einstein win a Nobel prize for?
His explanation of the photoelectric effect.
What is the SI unit for mass?
kilogram (kg)
List the base quantities and their SI units.
- Mass (kg)
- Length (m)
- Time (s)
- Current (A)
- Temperature (K)
- Amount of substance (mol)
What is a physical quantity?
A physical quantity is a quantity that can be measured. It consists of a numerical magnitude and a unit.
What are derived quantities?
All other physical quantities that can be derived from the 7 base quantities.
Fill in the blank: The SI unit for length is the _______.
metre (m)
Explain the concept of accuracy in measurement.
Accuracy refers to the closeness of a measurement to the true value of the physical quantity.
What is precision in measurement?
Precision refers to the limit to which a physical quantity is measured.
True or False: Random errors are predictable.
False
What is the precision of a digital micrometer screw gauge?
0.001 mm
What is the SI unit for time?
second (s)
What is the significance of significant figures in measurements?
They are the digits in any measurements that are known with certainty plus one digit that is uncertain.
Fill in the blank: The smallest unit an instrument can measure is known as its _______.
precision
What is the SI unit for temperature?
kelvin (K)
What is the relationship between significant figures and calculations?
The final result would round to the same decimal place or number of significant digits as the least precise or least accurate number.
What is the SI unit for length?
metre (m)
What is the SI unit for electric current?
ampere (A)
What is the SI unit for the amount of substance?
mole (mol)
What is the concept of conservation laws in physics?
Conservation laws constrain the changes in systems.
What is the role of forces in physics?
Forces help us understand motion.
Fill in the blank: Waves can transfer energy without transferring _______.
matter
What are the common instruments used to measure mass?
- Weighing scale
- Electronic balance
What is the relationship between the mass of an object and its weight?
Weight is the force exerted by gravity on an object, which depends on its mass.
What is the precision of a vernier caliper?
0.1 mm or 0.01 cm
What is the symbol for a second?
s
What is the symbol for a kilogram?
kg
What is the symbol for a metre?
m
What is the symbol for a kelvin?
K
What is the absolute zero in kelvins?
0K
What is the symbol for a mole?
mol
How many particles are in one mole?
6.02214076×10²³ particles (Avogadro’s constant).
What is the approximate value of Avogadro’s constant for exams?
6.02 × 10²³
What is the symbol for an ampere?
A
What is the symbol for a candela?
cd
What is the precision of a metre rule?
0.1cm or 1mm
What can veneer/digital calipers measure?
The internal and external diameters of an object as well as the depth of an object
What are the prefixes in physics?
Tera(T) - x10^12
Giga (G) - x10^9
Mega (M) - x10^6
Kilo(k) - x10^3
Deci(d) - x10^-1
Centi(c) - x10^-2
Mili (m) - x10^-3
Micro (the funny u) - x10^-6
Nano (n) - x10^-9
