Physics Tutor in Sector 97 Noida

+91-9958461445

If you live in Sector 97 Noida and Physics is not making sense to you, then the problem is not that Physics is impossible. The real problem is usually weak concept clarity. Many students attend school, watch videos, join coaching classes, but still they cannot solve questions based on linear momentum, impulse, circular motion and change in momentum.

At Kumar Physics Classes, Kumar Sir teaches Physics in a very clear and practical way. The focus is not only on formulas, but on understanding why a formula is used and how it should be applied in numerical problems.

Linear Momentum and Change in Momentum

Suppose a particle of mass m is moving with speed v in a circular path. Its speed may remain constant, but its velocity changes because direction changes continuously. Since momentum is a vector quantity, momentum also changes when direction changes.

The formula for change in momentum is:

Change in momentum = 2mv sin(theta/2)

Here, theta is the angle between initial and final velocity vectors.

If theta = 180 degree, then:

Change in momentum = 2mv sin 90 degree = 2mv

If theta = 120 degree, then:

Change in momentum = 2mv sin 60 degree = root 3 mv

This is where many students get confused. They forget whether sine will come or cosine will come. Kumar Sir explains such concepts through vector diagrams, so students understand the logic instead of blindly memorising formulas.

Why Kumar Physics Classes?

Kumar Sir has more than 30 years of teaching experience. He teaches Physics for CBSE, ICSE, ISC, NEET, JEE, AP Physics, IB Physics, A-Level Physics and Edexcel Physics. His teaching style is concept-based, exam-focused and numerical-oriented.

Students learn:

Concept clarity
Formula derivation
Numerical solving
HC Verma based practice
NCERT fundamentals
Board exam preparation
NEET and JEE level thinking

If you are weak in Physics, Kumar Sir starts from the basics and slowly builds your confidence.

Contact Kumar Physics Classes

Contact: +91-9958461445
Website: KumarPhysicsClasses.com
Email: kumarsirphysics@gmail.com

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Final Words

If you live in Sector 97 Noida and Physics is troubling you, do not waste time in random shortcuts. Physics becomes easy only when concepts are clear. Linear momentum, impulse, change in momentum and circular motion are very important chapters, and they need proper explanation.

For strong Physics concepts and numerical confidence, contact Kumar Physics Classes.

Contact: +91-9958461445
Website: KumarPhysicsClasses.com

25 Conceptual Questions on Change in Momentum in Circular Motion with Answers

Why does momentum change in circular motion even if speed is constant?
Answer: Because momentum is a vector quantity. Even if speed is constant, direction of velocity changes continuously, so momentum changes.
What is the formula for change in momentum when direction changes by angle theta?
Answer: Change in momentum = 2mv sin(theta/2).
In the formula 2mv sin(theta/2), what does theta represent?
Answer: Theta is the angle between initial and final velocity vectors.
If a particle completes half circle, what is the angle between initial and final momentum?
Answer: The angle is 180 degrees.
What is the change in momentum for half circular motion?
Answer: Change in momentum = 2mv.
If a particle completes quarter circle, what is theta?
Answer: Theta = 90 degrees.
For quarter circle, what is change in momentum?
Answer: Change in momentum = 2mv sin45° = root 2 mv.
If theta = 60 degrees, what is change in momentum?
Answer: Change in momentum = 2mv sin30° = mv.
If theta = 120 degrees, what is change in momentum?
Answer: Change in momentum = 2mv sin60° = root 3 mv.
If theta = 0 degrees, what is change in momentum?
Answer: Change in momentum is zero because direction has not changed.
Why do we not use simple subtraction mv – mv in circular motion?
Answer: Because momentum is a vector. We must subtract vectors, not only magnitudes.
Is change in momentum a scalar or vector?
Answer: Change in momentum is a vector quantity.
Does constant speed mean constant momentum?
Answer: No. Momentum depends on velocity, and velocity includes direction.
What is the magnitude of momentum at any point in uniform circular motion?
Answer: Magnitude of momentum is mv.
What changes continuously in uniform circular motion?
Answer: Direction of velocity and direction of momentum change continuously.
What remains constant in uniform circular motion?
Answer: Speed and magnitude of momentum remain constant.
Why is impulse related to change in momentum?
Answer: Because impulse equals change in momentum.
If change in momentum is larger, what happens to impulse?
Answer: Impulse is also larger.
For complete circular motion, what is net change in momentum?
Answer: Net change in momentum is zero because initial and final momentum are same.
Does momentum change during complete circular motion before returning to initial point?
Answer: Yes, momentum changes continuously during motion, but net change after one complete round is zero.
Why is centripetal force responsible for change in momentum?
Answer: Because centripetal force changes the direction of velocity and momentum.
Does centripetal force change the magnitude of momentum?
Answer: No. It changes only the direction of momentum in uniform circular motion.
What is the direction of instantaneous change in momentum in circular motion?
Answer: It is towards the centre of the circle.
Why is average force needed to calculate change in momentum over a time interval?
Answer: Because force is the rate of change of momentum.
What is the main concept students must remember?
Answer: In circular motion, speed may be constant, but momentum changes because direction changes. Formula: Change in momentum = 2mv sin(theta/2).