Tiêu đề IX Physics Module 1.pdf ✅

TERM – 1 INDEX Sr. No. Chapter Name Page No. 1. Measurement, Units, Dimensions and Vectors 1- 37  Physical quantities  System of units  Dimensional analysis  Basics of vectors  Vector addition & subtraction  Resolution of vectors  Unit vectors  Vector multiplication (scalar product) 2. Kinematics 38 - 93  Distance, displacement, speed and velocity  Uniform and non-uniform motion  Average velocity  Relative velocity  Acceleration and its types  Equations of motion  Motion graphs 3. Newton’s Laws of Motion 94 - 126  First Law of Motion  Second Law of Motion  Impulse  Third Law of Motion  Conservation of Momentum 4. Gravitation & Fluids 127 - 163  Law of Gravitation  Gravitation and third law of motion  Free Fall  Acceleration due to gravity  Variation in acceleration on earth  Mass and Weight  Kepler’s Laws of Planetary Motion  Pressure  Buoyancy and pressure in fluids  Archimedes principle
5. Work, Power & Energy 164 - 198  Work done  Area under force-displacement graph  Power  Energy and types of energy  Conservation of energy  Work energy theorem  Answer Keys 199 - 205
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MEASUREMENT, UNITS, DIMENSIONS & VECTORS IX -Physics Website: www.iitianspace.com | assessment.stepapp.in 2 PHYSICAL QUANTITIES Physics is all about understanding our physical environment. The laws of physics explain the various phenomena of nature. These laws are based upon observation & experiment. Careful observations & constant experimentation form the basis of every principle in physics. Experiments require measurements. Hence physics can be called as the science of measurements. The quantities which can be measured by an instrument & by means of which we can describe the laws of physics are called physical quantities. In other words, physical quantities are any quantity that can be defined and measured E.g.: Length, mass, velocity, force, density, time etc. There are large numbers of physical quantities and every physical quantity needs a unit to be measured. However, not all quantities are independent. E.g.: If a unit of length is defined, the unit of volume is automatically obtained. Thus we can define a set of fundamental quantities and all other quantities can be expressed in term of the fundamental quantities. UNITS Measurement of any physical quantity is expressed in terms of an internationally accepted certain basic standard called as unit. Unit is the quantity of a constant magnitude which is used to measure the magnitude of other quantities of the same nature. E.g.: Unit of length is metre, and of time is second, etc. A physical quantity must be expressed in the form of magnitude and unit. Thus, the magnitude of a physical quantity is expressed as below: Physical Quantity = (numerical value) Unit Eg: If the length of a piece of cloth is 10 metre, it means that the length is measured in the unit metre and this unit is contained 10 times in the length of that piece of cloth Types of Physical Quantities & Their Units There are two types of physical quantities 1. Base/Fundamental Quantities: Fundamental quantities are those which cannot be expressed in terms of other quantities. It is independent of any other quantity it can neither be changed nor related to any other fundamental quantity. E.g.: Mass, length, Time, Temperature, Current, Amount of substance, Angle, Luminous Intensity.