Lesson Notes By Weeks and Term v4 - SHS 2

Lesson Video

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Performance objectives

• Define circular motion and identify examples.
• Explain angular displacement, velocity, and acceleration.
• Describe the relationship between linear and angular quantities.
• Explain centripetal force and its significance.
• Calculate centripetal force and acceleration.

Lesson summary

Welcome, students! Today, we are exploring a fascinating type of motion that is all around us: Circular Motion. We see it every day, from a car navigating the Kwame Nkrumah Circle in Accra, to the blades of a standing fan cooling a room, or even the movement of the Earth around the Sun. Understanding the principles of circular motion is fundamental to understanding how satellites stay in orbit, how machines like corn mills work, and why we feel a push outwards when a tro-tro takes a sharp turn. This lesson will build a strong foundation for understanding the forces that govern our world, from the very small (atoms) to the very large (planets).

Lesson notes

2.1 What is Circular Motion?

Circular motion is the movement of an object along the circumference of a circle or rotation along a circular path.

There are two main types, but we will focus on the first: Uniform Circular Motion (UCM): This is when an object moves in a circle at a constant speed. The key word here is *speed* (a scalar quantity), not velocity. Non-uniform Circular Motion: This is when an object moves in a circle with a *changing speed*. For example, a car speeding up as it goes around a roundabout.

Example: Imagine a blade on a ceiling fan that is rotating at a steady "speed 2". Every point on that blade is undergoing uniform circular motion. Its speed is constant, but its direction is always changing. 2.2 The "Angular World" vs. The "Linear World"

Evaluation guide

• Demonstrate
• knowledge and
• understanding of
• circular motion.