When an object moves in a straight line at a constant speed, its velocity is constant. However, when an object moves in a circle, the rules of physics change significantly.
If you spin a stone tied to a string and suddenly cut the string, the stone will not fly straight out from the center. It will fly off in a straight line tangent to the circle.
The formula for Centripetal Acceleration is $a = \frac{v^2}{r}$.
Uniform Circular Motion is defined as the motion of an object traveling along a circular path at a constant, unvarying speed.
This is a very common exam question. If the speed is constant, how can there be acceleration?
An object will naturally want to fly off in a straight line due to inertia. To keep it moving in a circle, a constant inward force must be applied towards the center of the circle. This inward force is called Centripetal Force.
The moon revolving around the Earth, an artificial satellite orbiting a planet, and the tip of the second hand on a wall clock are all examples of uniform circular motion.
What are Canal Rays? (Anode Rays)
Learn what Canal Rays (Anode Rays) are in atomic structure. Understand their discovery by Goldstein and their key properties.
Can a Substance Contract on Heating? — Yes, Water Does
Yes, water contracts on heating from 0°C to 4°C — called anomalous expansion of water. Maximum density at 4°C = 1000 kg/m³. Full explanation with examples.
A Capacitor of Capacitance C Charged to V₀ Potential
A capacitor of capacitance C charged to V₀: charge Q = CV₀, energy stored U = ½CV₀². Two-capacitor problems, energy loss, Class 12 Physics explained.
What Happens When a Ceiling Fan is Switched Off?
When a ceiling fan is switched off, it decelerates gradually due to friction torque. Angular velocity decreases over time — Newton's first law of rotation and angular deceleration explained.
What is Centre of Curvature?
Learn the definition of centre of curvature for spherical mirrors. Understand its relationship with the radius of curvature and pole.
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