Physical Quantities Units And Measurements Flashcards
(25 cards)
What does SI unit stand for
And mean
The Système International d’Unitès is a system of metric units now used in many countries
The unit of length is….
Metre
What is length
Length is the distance travelled by light in a vacuum during a specific time interval.
What is volume?
The amount of small occupied
What is the unit of volume ?
Cubic centimetres
What is mass?
the measure of the amount of matter in a body.
What is the unit of mass ?
Kilograms
Kg
What is the unit of time ?
Second
s
What is time ?
the progression of events from the past to the present into the future.
Scalar quantities have …
Magnitude and units only
E.g distance
Vector quantities have
Both the magnitude and direction
E.g displacement
What is speed ?
The distance travelled per unit time
Average speed =
Distance move/time taken
Speed = distance / time
What is the SI unit of Speed?
m/s
ms-1
What is velocity ?
The rate of change of displacement
What is the SI unit of velocity
m/s
Metres per second
What is displacement ?
the distance moved in a straight line, in a given direction, from the starting point
What is the SI unit of displacement ?
Metre
M
Velocity =
Distance moved in a stated direction / time taken
Velocity =
Displacement / time taken
What is acceleration ?
It is the average of velocity / time taken
What is the SI unit of acceleration?
metres/second2(m/s2)
What is deceleration?
,a decrease in speed as the body moves away from the starting pointis defined as Deceleration. Deceleration is the opposite of acceleration. It is expressed as. Deceleration also is known as negative acceleration.
m/s²
What is the name of the graph obtained if velocity of a body is plotted against the time ?
Velocity time graph
