SI
A system of units known as ________ or International System is used by scientists and engineers all over the world.
physics
________ is a process by which we arrive at general principles that describe the behavior of the universe.
physical quantities
________ are related using equations.
uncertainty
________ or error of a measured value is an indication of the maximum difference there is likely to be between a measured value and the true value.
significant figures
________ are the meaningful digits in a measured value that tell us which digits are reliably known and which digit is uncertain.
operational definition
A(n) ________ is a procedure for measuring a fundamental quantity that serves as its definition.
physical quantity
A(n) ________ is a number used to describe an observation of a physical phenomenon quantitatively.
quantities
________ are measured by comparing them with a reference standard known as a unit.
accuracy
________ is the degree of closeness of a measured value to the true value.
International Bureau of Weights
A kilogram is the mass of a particular cylinder of platinum
standard SI prefixes
The ________ represent multiples and submultiples of 10 of the units they precede.
order of magnitude calculation
A(n) ________ is a rough, crude estimate which is designed to be accurate within a factor (usually) of 10.
physical quantities
A unit is a reference standard with which ________ are compared.
second
Time is measured in ________
second
The time required for 9,192,631,770 oscillations of Cesium 133 atom.
meter
Length is measured in ________
meter
The distance travelled by light (in a vacuum) in 1/299,792,458 seconds.
prefixes
Larger and smaller units of a predefined physical quantity are introduced using ______
significant figures
________ are the meaningful digits that tell us which digits are reliably known and which digit is uncertain.
vector
A quantity that has both magnitude and direction.
The x component of a vector A
Aₓ=Acosθ
The y component of a vector A
Aᵧ=Asinθ