Equilibrium of a Rigid Body Explained | Forces & Moments | A-Level Physics Mechanics
Learn the equilibrium of a rigid body in this clear and exam-focused Physics Mechanics lesson!
In this video, we explain the two key conditions required for a rigid body to be in equilibrium:
1️⃣ Resultant force = 0
2️⃣ Resultant moment (torque) = 0
You’ll see step-by-step worked examples involving forces, moments, pivot points, and clockwise/anticlockwise torque — perfect for mastering exam questions.
⚙️ In this lesson, you’ll learn:
• What a rigid body is in mechanics
• Conditions for translational equilibrium
• Conditions for rotational equilibrium
• How to calculate moments (torque = force × perpendicular distance)
• Taking moments about a pivot
• Solving beam and rod problems
• Common mistakes in equilibrium questions
This video is ideal for:
• A-Level Physics students
• AP Physics (Mechanics)
• IB Physics
• Introductory university mechanics
• Exam revision and problem-solving practice
Understanding rigid body equilibrium is essential for topics such as:
• Forces and statics
• Moments and torque
• Centre of mass
• Engineering mechanics
• Structural stability
📚 Topics Covered:
Rigid body equilibrium
Moments and torque
Conditions for equilibrium
Forces in balance
Beam problems
Statics
Physics mechanics fundamentals
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