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    Motion in A Straight Line - Detailed NCERT based notes Class 11 Physics Chapter 3

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    3. MOTION IN A STRAIGHT LINE 3.1 INTRODUCTION Kinematics: A branch of physics that deals with the motion of an object without going into the cause of motion is known as kinematics. Motion: The change in the position of an object with time with respect to a reference is called motion. Rectilinear motion: The motion of an object along a straight line is called rectilinear motion. Point object: The object whose size is much smaller than the distance it moves in a resonable duration of time are considered to be a point object. 3.2 POSITION, PATH LENGTH AND DISPLACEMENT Reference point : An arbitrary point taken as origin serves as the reference point. Frame of reference : The coordinate system along with a clock is called a frame of reference . ➤ If one or more coordinates of an object change with time, the object is said to be in motion. Otherwise the object is said to be in rest with respect to this frame ...
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    Units and Measurements - Revised NCERT based notes Class 11 Physics Chapter 2

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    2. UNITS AND MEASUREMENTS 2.1 INTRODUCTION Units: The certain basic, arbitrarily chosen, internationally accepted reference standards are called units. Example : kilogram, metre, metre per second, etc. Measurement: The comparision of a physical quantity with a certain basic, arbitrarily chosen, internationally accepted reference standard is called its measurement. Classification of units: (i) Fundamental or base units: The units for the fundamental or base quantities are called Fundamental or base units. They are not derived from/independent on other units. Example : metre, kilogram, second, etc. (ii) Derived units: The units which can be expressed as the combination of the base units are called derived units. Example : metre per second, kilogram metre per square of second, etc. NOTE : The complete set of these units, both the base units and derived units, is known as the system of units . 2.2 THE INTERNATI...
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