
In the case of uniform circular motion, which one of the following physical quantities does not remain constant?
A. mass
B. speed
C. linear momentum
D. kinetic energy
Answer
163.2k+ views
Hint: The momentum is defined as the product of mass and velocity. That means momentum depends on both mass as well as velocity. As velocity is a vector quantity which has both magnitude and direction. That is why momentum is also a vector quantity.
Complete step by step solution:
In uniform circular motion, the tangential acceleration is zero because of uniform motion. In this motion the magnitude of the velocity remains constant whereas its direction continuously changes. Therefore, the speed is constant throughout the motion. As we know the momentum is directly proportional to mass and the velocity.
As velocity is a vector quantity due to it having both magnitude and direction. So, in uniform circular motion the direction of the particle is always changing throughout the motion. Thus, velocity will also change in the circular motion. Therefore, the linear momentum will also be changing in uniform circular motion.
Hence option C is the correct answer.
Note: When any object is in motion it means the object must have momentum. For example, if a boy is riding a bicycle on the road with uniform motion, then the bicycle must have momentum. In physics, we calculate momentum as the product of mass and velocity as:
Momentum=mass\[ \times \] velocity
Or \[p = m \times v\]
As velocity is a vector quantity due to which momentum is also considered a vector quantity. This means momentum has a significance of magnitude and direction.
Complete step by step solution:
In uniform circular motion, the tangential acceleration is zero because of uniform motion. In this motion the magnitude of the velocity remains constant whereas its direction continuously changes. Therefore, the speed is constant throughout the motion. As we know the momentum is directly proportional to mass and the velocity.
As velocity is a vector quantity due to it having both magnitude and direction. So, in uniform circular motion the direction of the particle is always changing throughout the motion. Thus, velocity will also change in the circular motion. Therefore, the linear momentum will also be changing in uniform circular motion.
Hence option C is the correct answer.
Note: When any object is in motion it means the object must have momentum. For example, if a boy is riding a bicycle on the road with uniform motion, then the bicycle must have momentum. In physics, we calculate momentum as the product of mass and velocity as:
Momentum=mass\[ \times \] velocity
Or \[p = m \times v\]
As velocity is a vector quantity due to which momentum is also considered a vector quantity. This means momentum has a significance of magnitude and direction.
Recently Updated Pages
Uniform Acceleration - Definition, Equation, Examples, and FAQs

JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Atomic Structure and Chemical Bonding important Concepts and Tips

JEE Amino Acids and Peptides Important Concepts and Tips for Exam Preparation

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

Atomic Structure - Electrons, Protons, Neutrons and Atomic Models

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Displacement-Time Graph and Velocity-Time Graph for JEE

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

Degree of Dissociation and Its Formula With Solved Example for JEE

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

NCERT Solutions for Class 11 Physics Chapter 1 Units and Measurements

Units and Measurements Class 11 Notes: CBSE Physics Chapter 1

Motion in a Straight Line Class 11 Notes: CBSE Physics Chapter 2

NCERT Solutions for Class 11 Physics Chapter 2 Motion In A Straight Line

Important Questions for CBSE Class 11 Physics Chapter 1 - Units and Measurement
