Physics Tutor in Khar West Mumbai Contact Kumar Sir:
+91-9958461445
If you live in Khar West Mumbai, you already know that this area is one of the most active, educated and premium localities of Western Mumbai. Many students here study in good schools, live in well-developed residential societies, and have access to coaching, online lectures and YouTube content. Still, one common problem remains: Physics becomes weak.
The reason is very simple. Physics is not a subject of drama, shortcuts or random formula memorisation. Physics needs concept clarity, proper reasoning, mathematical understanding and step-by-step problem solving. Many students watch random videos, learn tricks without understanding the logic, and then get stuck in school exams, NEET, IIT JEE, IB, IGCSE, Edexcel, A-Level and AP Physics.
If you are in Khar West Mumbai and Physics questions are not opening in your mind, then you need a teacher who explains every concept from the root. Kumar Sir focuses on basic fundamentals, diagrams, graphs, derivations, numerical practice, previous year questions and doubt solving.
Contact Kumar Sir: +91-9958461445
Email: kumarsirphysics@gmail.com
Website: Kumar Physics Classes
Why Students in Khar West Need a Strong Physics Tutor
Students often feel that they are studying Physics, but when the exam paper comes, they cannot apply the concept. This happens because they have not understood the meaning behind the formula. For example, in projectile motion, students may remember formulas, but they do not understand why horizontal velocity remains constant, why the path is parabolic, or why time of flight does not depend on horizontal velocity.
Kumar Sir teaches Physics in a very systematic way. First, he explains the physical situation. Then he draws the diagram. After that, he writes the equations and explains every term. Then he solves numerical questions from basic to advanced level. This is the correct way to build Physics confidence.
Important Conceptual Questions Explained
1. Why is horizontal velocity constant in projectile motion?
In projectile motion, if air resistance is ignored, there is no horizontal force acting on the projectile. Since force is zero in the horizontal direction, horizontal acceleration is also zero.
So, horizontal velocity remains constant.
This is why we write:
vx = u cosθ
and it remains constant throughout the motion.
Kumar Sir explains this by separating projectile motion into two independent motions: horizontal motion and vertical motion.
2. Why does a projectile follow a parabolic path?
A projectile has uniform velocity in the horizontal direction and uniformly accelerated motion in the vertical direction. Horizontally, distance increases linearly with time. Vertically, displacement depends on time squared because of gravity.
When we eliminate time from the equations, the path becomes a quadratic equation. A quadratic equation represents a parabola.
That is why projectile motion follows a parabolic path.
3. Can average velocity be zero while average speed is non-zero?
Yes. If a body starts from one point, travels some distance and returns to the same point, displacement becomes zero.
Average velocity = displacement / time = 0
But distance travelled is not zero.
Average speed = distance / time
So average speed is non-zero.
This is a very important conceptual question for NEET, IIT JEE and school exams.
4. Can acceleration be opposite to velocity? What does it imply?
Yes. Acceleration can be opposite to velocity. When acceleration is opposite to velocity, the body slows down.
Example: A ball thrown vertically upward has upward velocity, but acceleration due to gravity acts downward. So the ball slows down until its velocity becomes zero at the highest point.
This means acceleration does not always increase speed. It can also decrease speed or change direction.
5. Why does relative velocity depend on the observer?
Velocity is always measured with respect to an observer. If two observers are moving differently, they will measure different velocities for the same object.
For example, a passenger sitting inside a moving train sees another passenger as stationary, but a person standing on the platform sees both passengers moving.
So relative velocity depends on the frame of reference.
6. Why is time of flight independent of horizontal velocity in projectile motion?
Time of flight depends only on vertical motion. Gravity acts vertically downward, so vertical velocity and vertical displacement decide the time of flight.
Horizontal velocity only decides how far the projectile travels horizontally. It does not affect how long the projectile remains in air.
That is why time of flight is independent of horizontal velocity.
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Why Kumar Sir?
Kumar Sir does not teach Physics like a shortcut subject. He explains every topic with logic. If the chapter is motion, he explains displacement, velocity, acceleration, graphs and equations. If the chapter is projectile motion, he explains horizontal and vertical components separately. If the chapter is SHM, he explains restoring force, acceleration, phase, velocity and energy.
Students who are weak in Physics usually need three things:
Concept clarity
Regular numerical practice
Personal doubt solving
Kumar Sir provides all three.
Final Message
If you live in Khar West Mumbai and Physics is becoming difficult, do not wait until exam pressure increases. Whether you are preparing for NEET, IIT JEE, CBSE, IB, IGCSE, Edexcel, A-Level or AP Physics, proper guidance can change your performance.
Physics becomes easy when it is taught properly.
Call / WhatsApp: +91-9958461445
Email: kumarsirphysics@gmail.com
Website: Kumar Physics Classes
50 Conceptual Physics Questions with Answers
1. Why is horizontal velocity constant in projectile motion?
Because no horizontal force acts on the projectile if air resistance is neglected. Hence horizontal acceleration is zero.
2. Why does a projectile follow a parabolic path?
Horizontal motion is uniform and vertical motion is accelerated due to gravity. Combining both gives a quadratic equation, which represents a parabola.
3. Can average velocity be zero while average speed is non-zero?
Yes. If displacement is zero but distance is not zero, average velocity becomes zero while average speed remains non-zero.
4. Can acceleration be opposite to velocity?
Yes. It means the body is slowing down. Example: a ball thrown upward has upward velocity but downward acceleration.
5. Why does relative velocity depend on the observer?
Because velocity is measured with respect to a frame of reference. Different observers may measure different velocities.
6. Why is time of flight independent of horizontal velocity?
Time of flight depends only on vertical motion because gravity acts vertically, not horizontally.
7. Can velocity be zero but acceleration non-zero?
Yes. At the highest point of vertical motion, velocity is zero but acceleration due to gravity is still g downward.
8. Can speed be constant while velocity changes?
Yes. In uniform circular motion, speed remains constant but velocity changes because direction changes continuously.
9. Why is displacement zero after one complete circle?
Because final position and initial position are the same. But distance equals circumference, so it is not zero.
10. Can distance be zero while displacement is non-zero?
No. If distance is zero, the body has not moved, so displacement must also be zero.
11. Can displacement be greater than distance?
No. Displacement is the shortest path between two points, so it can never exceed distance.
12. Why is acceleration constant in freely falling motion?
Near Earth’s surface, gravitational acceleration is almost constant, so acceleration remains g downward.
13. Why does a body feel weightless in free fall?
Because both body and support fall with the same acceleration, so normal reaction becomes zero.
14. Why does a stone thrown upward slow down?
Because acceleration due to gravity acts downward, opposite to the upward velocity.
15. At the top point of projectile motion, what becomes zero?
Only vertical component of velocity becomes zero. Horizontal component remains constant.
16. Is acceleration zero at the highest point of projectile?
No. Acceleration is always g downward throughout projectile motion.
17. Why is circular motion accelerated motion?
Because direction of velocity changes continuously, so velocity changes even if speed is constant.
18. What is centripetal acceleration?
It is acceleration directed towards the centre of circular path. Its value is v²/r.
19. Why does mud fly tangentially from a rotating wheel?
Because when mud loses contact, it moves in the direction of instantaneous velocity, which is tangential.
20. Can a body have acceleration without change in speed?
Yes. In uniform circular motion, speed is constant but acceleration exists due to change in direction.
21. Why is work done by centripetal force zero?
Centripetal force is perpendicular to displacement at every instant, so work done is zero.
22. Why does a passenger fall forward when bus stops suddenly?
Due to inertia of motion. Lower body stops with bus, upper body continues moving forward.
23. Why does a passenger fall backward when bus starts suddenly?
Due to inertia of rest. Feet move with bus, upper body tends to remain at rest.
24. Why are seat belts used in cars?
Seat belts prevent passengers from moving forward suddenly due to inertia during sudden braking.
25. Why is impulse important in collisions?
Impulse equals change in momentum. Increasing collision time reduces impact force.
26. Why does a cricketer move hands backward while catching?
To increase stopping time and reduce force on hands.
27. Why is momentum conserved in collision?
If external force is zero, total momentum of the system remains constant.
28. Can kinetic energy be conserved in all collisions?
No. Kinetic energy is conserved only in elastic collision, not in inelastic collision.
29. Why does a heavier body not fall faster in vacuum?
Because all bodies have same acceleration due to gravity in vacuum, independent of mass.
30. Why is friction sometimes useful?
Friction helps us walk, write, drive vehicles and hold objects.
31. Why is rolling friction less than sliding friction?
In rolling, surfaces do not rub continuously like sliding, so resistance is smaller.
32. Why does a satellite not fall on Earth?
It continuously falls towards Earth but also moves forward fast enough to keep missing Earth.
33. Why is orbital velocity independent of satellite mass?
Because gravitational force and required centripetal force both contain mass, which cancels out.
34. Why is escape velocity independent of mass?
Because both kinetic energy and gravitational potential energy contain mass, which cancels.
35. Why does time period of pendulum depend on length?
For small oscillations, T = 2π√(l/g). Larger length gives larger time period.
36. Why does pendulum slow down in air?
Air resistance removes mechanical energy, causing damping.
37. Why is SHM called periodic motion?
Because the motion repeats itself after equal intervals of time.
38. Is every periodic motion SHM?
No. For SHM, restoring force must be directly proportional to displacement and opposite in direction.
39. Why is acceleration maximum at extreme position in SHM?
Because acceleration is proportional to displacement. At extreme position, displacement is maximum.
40. Why is velocity maximum at mean position in SHM?
At mean position, potential energy is minimum and kinetic energy is maximum.
41. Why is total energy constant in ideal SHM?
Because energy continuously changes between kinetic and potential forms, but total remains constant.
42. Why does temperature affect pendulum time period?
Temperature increases length of pendulum, so time period increases.
43. Why does spring mass system execute SHM?
Because restoring force follows Hooke’s law: F = −kx.
44. Why does a spring become faster with larger spring constant?
Time period T = 2π√(m/k). Larger k gives smaller time period.
45. Why is phase important in SHM?
Phase tells the exact state of oscillation: position, velocity and direction at any instant.
46. Why are graphs important in motion?
Graphs show relation between displacement, velocity, acceleration and time clearly.
47. What does slope of displacement-time graph give?
It gives velocity.
48. What does slope of velocity-time graph give?
It gives acceleration.
49. What does area under velocity-time graph give?
It gives displacement.
50. What does area under acceleration-time graph give?
It gives change in velocity.