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XI-4-1 Vectors introduction.
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Introduction of vector quantities is explained in this lesson. It's required for motion in two dimensions.

Pradeep Kshetrapal is teaching live on Unacademy Plus

Pradeep Kshetrapal
State topper in school exams, selected in IIT Kharagpur, M.Sc., 30 yrs in teaching.

U
Unacademy user
please make some lessons on Riedel mechanism and Langmuir Hazelwood mechanism
Vidhi Shah
a year ago
it is already there.
Vidhi Shah
a year ago
in lesson on surface Mechanism
sir what about tensors
TZ
sir current has magnitude and direction both so it must be vector.
Pradeep Kshetrapal
5 months ago
No. Addition of current follow scalar laws and not like vectors. Hence current is scalar.
Am
Akshat mishra
5 months ago
how sir can you plzz explain sir. cause my doubts is same too
Chinmay Sawant
4 months ago
The complete definition of vector is the one which has magnitude and direction and it must follow the triangular law of vector addition But we don't apply triangular law while adding current hence it is a scalar
sir current has direction why is it a scalar quantity
excellent teaching sir. please upload all chapters & problems videos.
sir 12th ka revision batch kab sae start hoga
  1. PHYSICS Class XI Pradeep Kshetrapal


  2. Chapter 4. Motion in a plain VECTORS Lesson XI-4-1


  3. Types of quantities in Physics Scalar-quantity or Scalar has magnitude. Does not need direction for its description. Example: Mass, length, time, volume, speed, temperature, work, energy, power, current, potential. In mathematical operations scalars follovw rules of ordinary algebra Pradeep Kshetrapal


  4. Vector-quantity or Vector : a quantity which has both, magnitude and direction. Their description is not complete unless direction is specified Ex. Displacement, Area, velocity, acceleration, force, momentum, torque, magnetic moment. Vectors do not follow rules of mathematical operation of Algebra. They have their set of rules of mathematical operation for Vectors.


  5. Notation of vector quantity. A scalar can be represented by a simple letter as in algebra. x. r (only magnitude) A vector is represented by a letter and an arrow above it. Ex. r(magnitude and direction) Some times it is also represented by Bold capital letter like A or R Pradeep Kshetrapal


  6. Vector is a quantity which has magnitude and direction . It is represented by an arrow sign The point at which vector acts or from where arrow starts is called origin or tail. Head of the arrow is called head or terminal point. Direction 360 degrees Length of arrow represents its magnitude, the direction of arrow is direction of vector. Pradeep Kshetrapal


  7. Vector is a quantity which has magnitude and direction . It is represented by an arrow sign. The point at which vector acts D Direction0 degrees or from where arrow starts is called origin or tai Head of the arrow is called head or terminal point. Length of arrow represents its magnitude, the direction of arrow is direction of vector. Pradeep Kshetrapal


  8. Vector is a quantity which has magnitude and direction . It is represented by an arrow sign The point at which vector acts or from where arrow starts is called origin or tail. Head of the arrow is called head or terminal point. Direction60 degrees Length of arrow represents its magnitude, the direction of arrow is direction of vector. Pradeep Kshetrapal


  9. Vector is a quantity which has magnitude and direction . It is represented by an arrow sign The point at which vector acts or from where arrow starts is called origin or tail. Head of the arrow is called head or terminal point. Direction 90 degrees Length of arrow represents its magnitude, the direction of arrow is direction of vector. Pradeep Kshetrapal


  10. Vector is a quantity which has magnitude and direction. It is represented by an arrow sign. The point at which vector acts or from where arrow starts is called origin or tail Head of the arrow is called head or terminal point. Direction 150 degrees Length of arrow represents its magnitude, the direction of arrow is direction of vector. Pradeep Kshetrapal


  11. Vector is a quantity which has magnitude and direction. It is represented by an arrow sign. The point at which vector acts or from where arrow starts is called origin or tail Head of the arrow is called head or terminal point. Direction 330 degrees Length of arrow represents its magnitude, the direction of arrow is direction of vector. Pradeep Kshetrapal


  12. Vector is a quantity which has magnitude and direction . It is represented by an arrow sign The point at which vector acts or from where arrow starts is called origin or tail. Head of the arrow is called head or terminal point. Direction 360 degrees Length of arrow represents its magnitude, the direction of arrow is direction of vector. Pradeep Kshetrapal


  13. Definitions Equal vectors Equal vectors are those which have same magnitude (length) and same direction Pradeep Kshetrapal


  14. Addition of vectors. Addition of two vectors depends on direction. The resultant (black) depends on the angle between vectors. Minimum value is A-B and maximum value is A+B 0 0 Pradeep Kshetrapal


  15. Addition of vectors. Addition of two vectors depends on direction. The resultant (black) depends on the angle between vectors. Minimum value is A-B and maximum value is A+B 30 8 N, 0 6 N, 3013.5 N, 12.8 Pradeep Kshetrapal


  16. Addition of vectors. Addition of two vectors depends on direction. The resultant (black) depends on the angle between vectors. Minimum value is A-B and maximum value is A+B 210 8 N, 0 + 6 N, 2104.1 N, 313. 1 Pradeep Kshetrapal


  17. Addition of vectors. Addition of two vectors depends on direction. The resultant (black) depends on the angle between vectors. Minimum value is A-B and maximum value is A+B 240 8 N, 0 + 6 N, 2407.2 N, 313.9 Pradeep Kshetrapal


  18. Addition of vectors. Addition of two vectors depends on direction. The resultant (black) depends on the angle between vectors. Minimum value is A-B and maximum value is A+B 300 8 N, 0 +6 N, 3002.2 N, 334.7 Pradeep Kshetrapal


  19. Addition of vectors. Addition of two vectors depends on direction. The resultant (black) depends on the angle between vectors. Minimum value is A-B and maximum value is A+B 8 N, 0 + 6 N, 36014 N, 0 Pradeep Kshetrapal


  20. Addition : Triangle method-another example Second vector is moved such that its tail coincide with head of the first vector. Then a vector from tail of first to head of second gives resultant vector, or addition of two. Adding 2 Vectors


  21. Addition effects in x and y direction To Add 2 Vectors Numerically 15(5,14) 15 10 10 5 7,4)


  22. Addition by parallelogram Two vectors A and B of magnitude a and b, inclined at angle are acting at a point O. If these vectors are represented by two sides of a parallelogram then resultant i.e. addition is represented by the diagonal passing through O. R ABO The magnitude of this resultant is equal to r, the length of OQ which is equal to rON+ ON2 a sine M a cose N If a is the angle made by resultant then it is given by relation -OM MN +20M.MN +QN MMN2 2OM.MN +QN tan b acose Pradeep Kshetrapal


  23. Components of a vector, Vector B is | effective in both axis the directions. Its effect in x direction is given X-akis by Bx. And |effect in Y direction is given by By Pradeep 6a comp.avi


  24. Component Effect of a vector in a particular rection Magnitudes Ar Pradeep Kshetrapal


  25. Order no matter Five vectors are added in different order. Result by each method is same. Addition of five vectors: A+ B D+ E C+B Pradeep Kshetrapal


  26. Order no matter Five vectors are added in different order. Result by each method is same. Addition of five vectors: adog obetrgeiA+B+C D+E+A C+B+A


  27. Wind effecting airplane, add vectors Tailwind Headwind Crosswind velocity Twelocity |Resultan VelocityVelocity AiroplanWind Pradeep Kshetrapal


  28. Wind effecting airplane add vectors Tailwind Headwind Crosswind velocity Twelocity |Resultan VelocityVelocity AiroplanWind Pradeep Kshetrapal


  29. Wind effecting airplane add vectors Tailwind Headwind Crosswind Velocity Twelocity |Watan VelocityVelocity Resultan AiroplanWind Pradeep Kshetrapal


  30. Adding vectors, river and boat Motion of Riverboat With Current Motion of River boat Without Current Pradeep Kshetrapal


  31. Adding vectors, river and boat Motion of Riverboat With Current Motion of River boat Without Current Pradeep Kshetrapal


  32. Add Horizontal and vertical velocity of the bomb Pradeep Kshetrapal


  33. Add Horizontal and vertical velocity of the bomb Pradeep Kshetrapal


  34. Add Horizontal and vertical velocity of the bomb Pradeep Kshetrapal


  35. Projectile under gravity Pradeep Kshetrapal


  36. Projectile under gravity Pradeep Kshetrapal


  37. Projectile under gravity Pradeep Kshetrapal


  38. Projectile under gravity Vertical free fall Gravity- free path Pradeep Kshetrapal


  39. Horizontal projectile t- s miS Pradeep Kshetrapal


  40. Horizontal projectile t-9.0s 100 m/s Yy- 90 m/s Pradeep Kshetrapal


  41. Non Horizontal projectile Ty m/s Vy=--m/s m/s Pradeep Kshetrapal


  42. Non Horizontal projectile t 14.0s 60m/s vy=-80 m/s Tx= Pradeep Kshetrapal


  43. Ball observed from moving truck and ground Pradeep Kshetrapal


  44. Ball observed from moving truck and ground Pradeep Kshetrapal


  45. Maximum range 30 45 60 Pradeep Kshetrapal


  46. Maximum range 30 45 60 Pradeep Kshetrapal


  47. Maximum range 30 45 60 Pradeep Kshetrapal


  48. Maximum range 30 45 60 Pradeep Kshetrapal


  49. Monkey and Zookeeper If there is no gravity, and Banana is thrown aiming monkey ) Pradeep Kshetrapal


  50. Thrown above monkey, Gravity present Pradeep Kshetrapal


  51. Thrown above monkey, Gravity present Pradeep Kshetrapal


  52. Aiming monkey, throw fast Pradeep Kshetrapal


  53. Aiming monkey, throw fast 2 Pradeep Kshetrapal


  54. Aiming monkey throw slow Pradeep Kshetrapal


  55. Aiming monkey throw slow Pradeep Kshetrapal