Equilibrium Class 9 Physics | Conditions of Equilibrium | Types of Equilibrium | FBISE | KPK BOARDS

This video is about equilibrium class 9 physics chapter 4 turning effect of forces. in this lecture i discussed in detail 1. what is equilibrium 2. what are the types of equilibrium 3. what are the conditions of equilibrium Equilibrium refers to a state of balance where opposing forces or actions are equal, leading to no net change. Equilibrium can be categorized into two main types: static and dynamic, and further subdivided into stable, unstable, and neutral equilibrium. Types of Equilibrium: Static Equilibrium: An object is at rest and the net force and net torque acting on it are zero. For example, a book resting on a table is in static equilibrium. Dynamic Equilibrium: A system is in motion but its motion is not changing with time, meaning the forward and reverse processes occur at the same rate, and the system's properties remain constant. For example, a chemical reaction where the rate of the forward and reverse reactions are equal. Equilibrium refers to a state of balance where opposing forces or actions are equal, leading to no net change. Equilibrium can be categorized into two main types: static and dynamic, and further subdivided into stable, unstable, and neutral equilibrium. Types of Equilibrium: Static Equilibrium: An object is at rest and the net force and net torque acting on it are zero. For example, a book resting on a table is in static equilibrium. Dynamic Equilibrium: A system is in motion but its motion is not changing with time, meaning the forward and reverse processes occur at the same rate, and the system's properties remain constant. For example, a chemical reaction where the rate of the forward and reverse reactions are equal. Dynamic equilibrium can be further divided into two main types: Dynamic Translational Equilibrium Definition: A body is said to be in dynamic translational equilibrium when it is moving in a straight line with constant speed, and the net translational force (force in a straight line) acting on it is zero. Translational motion is movement along a straight path — like sliding, gliding, or moving forward. Conditions: The body must be moving in a straight line. Speed must be constant. All forces acting along the line of motion cancel each other out (net force = 0). No acceleration occurs. Examples: Example 1: A Car on a Straight Highway A car is moving at 80 km/h on a straight, flat road. The engine provides a forward force. Air resistance and friction from the road act backward. If forward and backward forces are equal → net force = 0 The car is in dynamic translational equilibrium. Example 2: A Ship Sailing Smoothly A ship moves through calm water at a constant speed. The engine pushes it forward. Water resistance opposes motion. Equal forces → balanced → ship is in translational dynamic equilibrium. Dynamic Rotational Equilibrium Definition: A body is said to be in dynamic rotational equilibrium when it is rotating at a constant angular speed, and the net torque (turning effect of forces) acting on it is zero. Rotational motion is spinning or turning around a fixed axis. Conditions: The object must be rotating, not just moving linearly. The angular velocity (speed of rotation) must be constant. No unbalanced torque should act on the object (net torque = 0). No angular acceleration. Examples: Example 1: A Ceiling Fan at Constant Speed When you turn on a fan and it reaches a steady speed: The motor applies torque to keep it spinning. Air resistance opposes the spin. At constant speed, motor torque = air resistance torque. The fan is in dynamic rotational equilibrium. Example 2: A Flywheel in a Machine In many engines, flywheels spin to store rotational energy. Once spinning steadily, frictional torque is balanced by motor torque. This is rotational dynamic equilibrium. For more amazing lectures please subscribe our channel. For more lectures of class 9th FBISE physics visit link below    • class 9 physics chapter 4 | dynamics 2 | F...   class 9 Physics kpk textbook board    • class 9 physics chapter 4 | Turning effect...   #Physics #Equilibrium #TypesOfEquilibrium #ConditionsOfEquilibrium #Class9Physics #FBISE #KPKBoard #PhysicsConcepts #ScienceShorts #PhysicsLecture #Education #LearnPhysics #Statics #Forces #PhysicsBasics