Kinematics lessons for CBSE Class 11 Physics

In the CBSE syllabus

1. Lesson 2Frame of Reference & Coordinate System

   Sitting still on a speeding subway: are you moving or not?

   Syllabus details

   Syllabus: Unit II Kinematics, Chapter-2 Motion in a Straight Line: 'Frame of reference'

2. Lesson 6Average Speed vs Average Velocity vs Instantaneous Velocity

   Two taxi rides to the same place: 7.5 km in 14 min, or 10 km in 15 min. Which one is faster?

   Syllabus details

   Syllabus: Unit II Kinematics, Chapter-2 Motion in a Straight Line: 'average speed and average velocity and instantaneous velocity'

Partly in the syllabus

Only part of the lesson is in the syllabus. Each lesson says which part.

1. Lesson 4Scalars vs Vectors

   Current has a direction, so why is it a scalar?

   Syllabus details

   Syllabus: Unit II Kinematics, Chapter-3 Motion in a Plane: 'Scalar and vector quantities'

   In it: Scalar and vector quantities are listed. Not in it: They sit in Chapter 3 (Motion in a Plane), not in Chapter 2 where straight-line motion is taught.

2. Lesson 5Distance vs Displacement

   Run a full lap on a 400 m track: is your displacement 400 m or 0?

   Syllabus details

   Syllabus: Unit II Kinematics, Chapter-3 Motion in a Plane: 'position and displacement vectors'

   In it: Position and displacement vectors are listed, in Chapter 3. Not in it: Distance (path length) as a quantity is not named in the syllabus text.

3. Lesson 7How to Find Average Velocity of a Multi-Part Trip

   A car covers 1/4 of the trip at 20 m/s and the rest at speed v. The whole-trip average velocity is 16 m/s. What is v?

   Syllabus details

   Syllabus: Unit II Kinematics, Chapter-2 Motion in a Straight Line: 'uniform and non- uniform motion, average speed and average velocity and instantaneous velocity'

   In it: Average speed and average velocity in uniform and non-uniform motion are named in Chapter 2, which is the content of this lecture. Not in it: Trips split into stages, and finding one stage's speed from the whole-trip average, are not named. The NCERT textbook was not read.

4. Lesson 9What Is Acceleration? Why It's 180, Not 20

   You gain 30 points in 120 days, your friend gains 10 points in 10 days. Who improved faster?

   Syllabus details

   Syllabus: Unit II Kinematics, Chapter-2 Motion in a Straight Line: 'uniformly accelerated motion'; 'Relations for uniformly accelerated motion (graphical and calculus treatment)'

   In it: Uniformly accelerated motion and its equations are listed. Not in it: Acceleration as a defined quantity (a = Δv/Δt) is not named on its own in the syllabus text.

Not listed as a separate topic

These are basic ideas that the later lessons build on, so they are still worth watching first.

1. Lesson 1Point Mass (Particle) Explained

   Can a walking cat be treated as a particle?

2. Lesson 3Instant vs Time Interval

   Is "the 3rd second" a moment or a stretch of time?

3. Lesson 8How to Find Change in Velocity: Why It's 7, Not 3

   A ball hits the ground at 5 m/s and bounces up at 2 m/s. Is its change in velocity 3 m/s or 7 m/s?

4. Lesson 10Speeding Up or Slowing Down? Check a and v

   A car's acceleration keeps getting smaller. Is it speeding up or slowing down?