9702 · 12.1
Kinematics of uniform circular motion
Welcome to the exciting world of **uniform circular motion**! Ever wondered how roller coasters loop-the-loop or satellites stay in orbit? It all comes down to the physics of objects moving in circles. We'll explore key concepts like **angular displacement**, **angular velocity**, **centripetal acceleration**, and **centripetal force** that govern this fundamental type of movement. This pilot aligns with **Senpai Corner** A Level notes (2025–2027) for topic **12.1**.
Need to know
What you need to know
- The angular displacement of a body is the change in angle (radians, degree or revolutions) through which the body rotates around a circle.
- Angular displacement is the ratio of: 𝛥𝜃 = 𝛥𝑠 𝑟.
- A radian (rad) is defined as the angle subtended at the centre of a circle by an arc equal in length to the radius of the circle.
- Radians is usually written in term of π.
- For a rotation for a complete circle (360 0 ), the radians is 2 π ( 𝛥𝜃 = 2πr/r).
Explanation
Kinematics of uniform circular motion
- The angular displacement of a body is the change in angle (radians, degree or revolutions) through which the body rotates around a circle.
- Angular displacement is the ratio of: 𝛥𝜃 = 𝛥𝑠 𝑟.
- A radian (rad) is defined as the angle subtended at the centre of a circle by an arc equal in length to the radius of the circle.
- Radians is usually written in term of π.