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 is Threshold Frequency in Physics?
Learn the definition of Threshold Frequency in the Photoelectric Effect. Understand why no electrons are emitted below this frequency regardless of light intensity.
Time and Work: Formula and Solved Examples
Learn the basic formula for Time and Work problems. Includes the concept of efficiency, work done per day, and solved examples for competitive exams.
What is Time Period? (Definition and Formula)
Learn the definition of Time Period in physics. Understand how it relates to frequency, its formula (T = 1/f), and examples from pendulums and waves.
Time Period of a Simple Pendulum: Formula and Derivation
Learn the formula for the time period of a simple pendulum T=2π√(L/g). Understand what factors affect and do not affect its time period.
Transformer Ratio — Turns Ratio, Formula and Step-up/Step-down
The transformer ratio (turns ratio) is the ratio of secondary to primary turns, equal to the voltage ratio. Learn the formula, step-up and step-down transformers.
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