00:00Elasticity. The power of flexibility. The concept of elasticity.
00:05Elasticity is the property of a material that allows it to return to its original shape after being deformed by an external force.
00:11In simple words, it tells us how flexible a material is, and how easily it can regain its original shape after being stretched, compressed, or bent.
00:20Everyday examples of elasticity.
00:23Rubber band. Stretch it. And it returns to its original length when released.
00:27Spring.
00:30Compress. Or stretch a spring. And it regains its shape afterward.
00:35Trampoline. The surface bends when you jump and comes back to its flat position.
00:40Ball. Press. Or throw a ball.
00:44It deforms temporarily, and then returns to its original shape.
00:48Elasticity is observed in countless daily objects around us.
00:52Elastic limit. The limit of flexibility every material has a limit to its elasticity, called the elastic limit.
00:58Within the elastic limit, a material returns completely to its original shape.
01:03Beyond the elastic limit, permanent deformation occurs, and the material does not fully recover.
01:10Example.
01:11Stretch a rubber band gently gives it, returns to original length.
01:15Stretch it too much, gives it may break or lose shape permanently.
01:18Stress. And strain to understand elasticity.
01:21Two important concepts are used.
01:25Stress.
01:26The force applied per unit area of a material.
01:30Strain.
01:31The measure of deformation relative to the original shape or length.
01:35The relationship between stress and strain determines the material's elastic behavior.
01:40Hooke's law.
01:42The principle of elasticity.
01:44Hooke's law states that as long as the material stays within its elastic limit, stress is directly proportional to strain.
01:52In simple terms, the more force you apply, the more it stretches, but proportionally.
01:57Example.
01:59Place a weight on a spring.
02:01It stretches.
02:02Remove the weight gives the spring returns to its original shape.
02:05Applications of elasticity.
02:07Engineering.
02:09Bridges and buildings rely on elasticity to absorb shocks and prevent breaking.
02:14Sports equipment.
02:16Trampolines.
02:17Rubber balls.
02:18And rackets.
02:19Use elasticity for performance.
02:21Vehicles.
02:23Suspension systems use springs to absorb bumps and vibrations.
02:28Medical devices.
02:30Elastic bandages and braces rely on elasticity for support.
02:34Plastic deformation and fracture.
02:36If a material is stretched beyond its elastic limit, it undergoes plastic deformation, meaning permanent shape change.
02:44Excessive force can lead to fracture, where the material breaks.
02:48Importance of elasticity safety.
02:51Helps structures and machines absorb sudden forces.
02:54Comfort.
02:56Smooth motion and shock absorption in vehicles and sports equipment.
03:00And everyday use.
03:02Rubber bands, springs, toys, and tools depend on elasticity for usability.
03:08Elasticity explains how materials flex, stretch, compress, and recover.
03:14Making it a fundamental concept in physics, engineering, and daily life.
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