vectors1 ppt6
DESCRIPTION
this is first part uploaded with video on youtubeTRANSCRIPT
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VIDEO 6
WWW.JEEPHYSICSGURU.COM
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BASIC MATHEMATICS
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Till now covered• Units and dimensions
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Till now covered• Units and dimensions• Dimensional analysis
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Till now covered• Units and dimensions• Dimensional analysis• Significant figures
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Till now covered• Units and dimensions• Dimensional analysis• Significant figures• Least count
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Till now covered• Units and dimensions• Dimensional analysis• Significant figures• Least count• Error analysis
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Important concepts
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Important concepts• Knowledge of same basic graphs , like equation of line y = m.x + c , quadratic equations
etc.
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Important concepts• Knowledge of same basic graphs , like equation of line y = m.x + c , quadratic equations
etc.• Basic knowledge of trigonometry.
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Important concepts• Knowledge of same basic graphs , like equation of line y = m.x + c , quadratic equations
etc.• Basic knowledge of trigonometry.• Vectors
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Important concepts• Knowledge of same basic graphs , like equation of line y = m.x + c , quadratic equations
etc.• Basic knowledge of trigonometry.• Vectors • Calculus basics
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Cover two topicsWe cover two topics for now First :VECTORS
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Cover two topicsWe cover two topics for now First :VECTORSThen Later:CALCULUS
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Vectors (type of physical quantity)
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DEFINITION SCALARS Quantities in physics which are
determined uniquely by one number are called scalars.
Example:Mass , temperature , distance , speed , time ,
work , energy.
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DEFINITION VECTORSQuantities in physics which are determined
completely by two things 1st -> Magnitude2nd ->Direction are called vectors.Example: weight , force ,acceleration ,velocity, displacement .
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Don’t Get Confused• Physics and English Dictionary are Different.• Mass , Weight ho ya speed ,velocity • Both means same in English dictionary.
BUT• In PHYSICS both have completely DIFFERENT Meanings.
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To Understand VectorsTo understand vectors we will consider examples
of vectors for easy understanding.
Pehla concept hai Distance/Displacement ka.
Doosra concept hai speed/velocity.
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Easiest thing to measure in a body :“ ITS POSITION WITH TIME “
Position is calculated with some reference point always .
Reference point is called ORIGIN.
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3 Types of motion
1-dimensional motion. 2-dimensional motion. 3-dimensional motion.
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1-D Motion 1-Dimensional motion means:• body only moves along a line.• only one number good enough to represent a
position uniquely.• one single axes used to represent it.Simplest Example:
“ Motion Of a Freely Falling Ball “
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Motion of ball
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Three positions during fall
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Reference point dependence If top is reference point then initial value of position is 0 final value of position is -H
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Reference point dependence If middle is reference point then initial value of position is H/2 final value of position is -H/2
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Reference point dependence If ground is reference point then initial value of position is H final value of position is 0
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THREE CASES
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2-D Motion2 –dimensional motion means:• Body moves on a plane.• There are 2 numbers needed to specify a
unique position.• 2 perpendicular axes used to represent it.
• 2²=4 quadrants made by axes
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Representation of positions on 2D
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3-D Motion 3 dimensional motion means :• Body moves in space.• There are 3 numbers needed to specify a unique position.• 3-perpendicular axes used to represent it.
• 2³ = 8 octants made by axes.
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3 axes, 3 numbers used to represent
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Example of a CUBE
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SAY A FLY MOVES IN CUBETHENFly’s position will always be (at any time)
determined uniquely by 3 numbers ( x,y,z).WHERE 0<x<1 , 0<y<1, 0<z<1 So here motion of fly is 3 dimensional
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SO THESE WERE 3 TYPES OF POSSIBLE MOTION:
NEXT:
We further understand vectors.
Taking distance /displacement ,speed /velocity as examples in next video
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• Abhi ke liye good bye…..