Principle of Moments

Introduction to the Principle of Moments

• The Principle of Moments is a fundamental concept in rotational mechanics.
• A moment is the turning effect of a force and is measured in newton metres (Nm).
• The moment of a force can be calculated by the formula: Moment = Force x Distance.

Understanding the Principle of Moments

• The Principle of Moments states that for an object to be in equilibrium, the sum of the clockwise moments about any point must equal the sum of the anticlockwise moments.
• A body is said to be in equilibrium when it’s not moving or rotating. This also implies that it’s not accelerating or decelerating.

Featuring Levers In Moments

• A lever is a simple machine that uses the Principle of Moments.
• In a lever, the pivot point (or fulcrum) is the point about which a lever rotates.
• The closer the force is to the fulcrum, the less force is needed to create a moment.

Real World Examples of the Principle of Moments

• Examples of where the principle of moments is used includes seesaws, crowbars, door handles, and scissors.
• By understanding and applying the Principle of Moments, we can design systems and machines effectively and understand how different forces and distances can affect balance and rotation.