CBSE Class 11th Uniform circular motion Details & Preparations Downloads
What Is Uniform Circular Motion?
Uniform Circular Motion is a specific type of motion in which an object travels along a circular path at a constant speed.This concept is fundamental in physics and is applicable to various scenarios, from celestial bodies orbiting in space to objects moving in circular paths on Earth.
Key Components of Uniform Circular Motion:
Constant Speed: The object in uniform circular motion maintains a consistent speed throughout its journey. This means that the magnitude of its velocity (a vector quantity representing both speed and direction) remains unchanged. The direction of the velocity, however, is continually changing as it is always tangent to the circle at any given point.
Centripetal Acceleration: Despite the constant speed, there is an acceleration involved in uniform circular motion. This acceleration is called centripetal acceleration and is directed toward the centre of the circle. It is responsible for keeping the object in its circular path. The formula for centripetal acceleration (ae) is given by ac=v2 , where v is the speed of the object, and r is the radius of the circular path.
Centripetal Force: The force responsible for providing the centripetal acceleration is called centripetal force (Fc). In many cases, gravity acts as the centripetal force, especially in the context of celestial bodies in orbit. The formula for centripetal force is Fc=m⋅ac, where m is the mass of the object.
Examples of Uniform Circular Motion:
Planetary Orbits:

Example: The Earth revolving around the Sun.

Explanation: Planets in our solar system, including Earth, exhibit uniform circular motion as they orbit the Sun. The gravitational force between the Sun and the planet acts as the centripetal force, keeping the planet in its nearly circular orbit.
Satellite Orbits:

Example: Communication satellites in geostationary orbit.

Explanation: Satellites in geostationary orbit circle the Earth at a constant speed and altitude, ensuring that they remain positioned above a fixed point on the Earth's surface. This is a form of uniform circular motion.
Whirling a Ball on a String:

Example: Swinging a ball around in a horizontal circle.

Explanation: When you swing a ball attached to a string in a horizontal circle, the ball undergoes uniform circular motion. The tension in the string provides the centripetal force necessary to keep the ball in its circular path.
Carousels:

Example: Amusement park carousels.

Explanation: The rotating platform of a carousel spins at a constant speed, providing riders with a classic example of uniform circular motion. The centripetal force is generated by the mechanical structure of the ride.
Ferris Wheels:

Example: Giant Ferris wheels.

Explanation: The cabins on a Ferris wheel move in a circular path at a constant speed, creating a sense of uniform circular motion for the riders. The wheel's structure ensures a consistent rotational speed.
CBSE Class 11th Downloadable Resources:
1. CBSE Class 11th Topic Wise Summary  View Page / Download 
2. CBSE Class 11th NCERT Books  View Page / Download 
3. CBSE Class 11th NCERT Solutions  View Page / Download 
4. CBSE Class 11th Exemplar  View Page / Download 
5. CBSE Class 11th Previous Year Papers  View Page / Download 
6. CBSE Class 11th Sample Papers  View Page / Download 
7. CBSE Class 11th Question Bank  View Page / Download 
8. CBSE Class 11th Topic Wise Revision Notes  View Page / Download 
9. CBSE Class 11th Last Minutes Preparation Resources  View Page / Download 
10. CBSE Class 11th Best Reference Books  View Page / Download 
11. CBSE Class 11th Formula Booklet  View Page / Download 
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SAMPLE PRACTICE QUESTIONS OF SIGNIFICANT FIGURES :
Q1. What is Uniform Circular Motion?
Answer: Uniform Circular Motion is the motion of an object in a circular path at a constant speed. The object's speed remains the same, but its direction continuously changes, creating circular motion.
Q2. How is Uniform Circular Motion Different from Linear Motion?
Answer: In linear motion, an object moves in a straight line, while in uniform circular motion, it follows a circular path. The key difference lies in the constant change of direction in circular motion.
Q3. What Keeps an Object in Uniform Circular Motion?
Answer: An object in uniform circular motion is kept in its path by a centripetal force. This force acts toward the center of the circle and is responsible for changing the object's direction.
Q4. Is the Speed Constant in Uniform Circular Motion?
Answer: Yes, the speed of an object in uniform circular motion is constant. However, since the direction changes continuously, it experiences acceleration known as centripetal acceleration.
Q5. What is Centripetal Acceleration?
Answer: Centripetal acceleration is the acceleration directed toward the center of the circular path. It is always perpendicular to the object's velocity and is responsible for keeping the object in its circular motion.
Class 11th CBSE Physics Chapters 
Chapter1: UNITS AND MEASUREMENTS 
Chapter2: MOTION IN A STRAIGHT LINE 
Chapter3: MOTION IN A PLANE 
> Introduction 
> Scalars and vectors 
> Multiplication of vectors by real numbers 
> Addition and subtraction of vectors – graphical method 
> Resolution of vectors 
> Vector addition – analytical method 
> Motion in a plane 
> Motion in a plane with constant acceleration 
> Projectile motion 
Chapter4: LAWS OF MOTION 
Chapter5: WORK, ENERGY AND POWER 
Chapter6: SYSTEM OF PARTICLES AND ROTATIONAL MOTION 
Chapter7: GRAVITATION 
Chapter8: MECHANICAL PROPERTIES OF SOLIDS 
Chapter9: MECHANICAL PROPERTIES OF FLUIDS 
Chapter10: THERMAL PROPERTIES OF MATTER 
Chapter12: KINETIC THEORY 
Chapter13: OSCILLATIONS 
Chapter14: WAVES 
Class 11th CBSE Chemistry Chapters 
Chapter1: SOME BASIC CONCEPTS OF CHEMISTRY 
Chapter2: STRUCTURE OF ATOMS 
Chapter3: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES 
Chapter4: CHEMICAL BONDING AND MOLECULAR STRUCTURE 
Chapter5: THERMODYNAMICS 
Chapter6: EQUILIBRIUM 
Chapter7: REDOX REACTIONS 
Chapter8: ORGANIC CHEMISTRY  SOME BASIC PRINCIPLE AND TECHNIQUES 
Chapter9: Hydrocarbons HYDROCARBONS 
Class 11th CBSE Mathematics chapter 
Chapter1: SETS 
Chapter2: RELATIONS AND FUNCTIONS 
Chapter3: TRIGONOMETRIC FUNCTIONS 
Chapter4: COMPLEX NUMBER AND QUADRATIC EQUATIONS 
Chapter5: LINEAR INEQUALITIES 
Chapter6: PERMUTATIONS AND COMBINATIONS 
Chapter7: BINOMIAL THEOREM 
Chapter8: SEQUENCES AND SERIES 
Chapter9: STRAIGHT LINES 
Chapter10: CONIC SECTIONS 
Chapter11: INTRODUCTION TO THREEDIMENSIONAL GEOMETRY 
Chapter12: LIMITS AND DERIVATIVES 
Chapter13: STATISTICS 
Chapter14: PROBABILITY 
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