Physical Quantities and Measurements Flashcards
How many Basic Quantities are there?
7
Name the Physical Quantities?
Length, Mass, Time, Temperature, Current, Light Intensity, Mole.
What is Length?
The distance travelled from 1 point to another.(m)
What is Mass?
Amount of Substance. (Kg)
What is Time?
Second (s).
What is Temperature?
The heat or coldness of any substance. (K)
What is Light Intensity?
Candela (Ca).
What is Current?
The movement of electron from the (+) terminal to the (-) terminal. (A)
What is Mole?
Amount of Substance (mol).
What is Parallax Error?
They are human errors like human reaction time or eye visual contact error.
How to avoid parallax error for eye visual contact?
We need to have our eye directly above the marked measurement on the scale.
What are Significant Figures?
The figures given for how much accurate the measurement is.
Write the formulas for these terms?
Area of Square: Length x Breadth (m2)
Area of Triangle: 1/2(base x height) (m2)
Area of Circle: 3.14 x (Radius) Square.
Radius: Circumference/2(3.14)
Circumference: 2(3.14)(radius)
Volume of Cylinder: (3.14)(radius)2(height)
What is Volume?
Something that occupies space.
Formula: L x B x H
SI Unit: m3
What do time measuring devices rely on?
On oscillations.
What is a Systematic Error?
Systematic errors can occur when the zero point on the measuring scale is not level with the ground, either due to its elevation or when the scale is tilted at an angle.
What is the equation to find out resultant force at an angle?
Force = Square Root(Fx2 + Fy2)
Angle: tan inverse = Fy/Fx
What is a Scalar Quantity?
A quantity that consists of magnitude(size), for example: length, distance, time, mass etc.
What is a Vector Quantity?
The quantity that consists of magnitude and direction, for example: Displacement, weight, velocity etc.
