Ch-02 Units & Measurement - Amazon S3

Ch-03Vectors

Lect-01

03-07-2020 Physicswallah Alpha Physics

Today’s Goal

Introduction to Vectors


Why do we need Vectors?

Physical Quantity (PQ) = 𝒏 𝝁


Numerical value(magnitude)

Unit

Difference between Scalar Quantities & Vector Quantities

Scalar Quantities Vector Quantities

1)) Numerical Value Only a) Numerical Valueb) Directionc) Obeys Vector Law of addition

2) Added according to ordinary rules of algebra.

2) Added according to Vector Law of Addition

Examples: Mass, distance, speed, Temperature , Energy

Example: Displacement, velocity, Force, Acceleration


Note: All vector Quantities have direction But

All Quantities that have direction are not Vectors.


Representation of Vectors

Tail Head



Q1) Draw the following Vectors :(i) 5N 37o East of South (ii) 2m/s 30o West of North

Important Points related to Vectori. On Rotating 2π Vector does not change.

ii. A vector can shift parallel to itself.


The Angle between two vectors is the smaller of the two angles between the vectors when they are joined tail to tail

𝟎𝒐 ≤ 𝜽 ≤ 𝟏𝟖𝟎𝒐

• The Angle between two vectors is the smaller of the two angles between the vectors when they are joined tail to tail

𝟎𝒐 ≤ 𝜽 ≤ 𝟏𝟖𝟎𝒐


iii.

Q) Find the angle between 𝑨 & 𝑩



Q1) Find angle between (1) 𝑨 & 𝑩 (2) 𝑨 & 𝑪 (3) 𝑩& 𝑪

Types of Vectors


Equal Vectors

Negative of a Vector


Parallel & Antiparallel Vectors

• Parallel Vectors

• Antiparallel Vectors

𝜽=0o

𝜽=180o


Collinear & Coplanar Vectors• Collinear Vectors

• Coplanar Vectors


Concurrent Vectors


Unit & Zero/Null Vector

• Unit Vector

• Zero/Null Vector


Thank You

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Ch-02 Units & Measurement - Amazon S3

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