Ever wondered why springs bounce back or why some materials...
Physics119 views·Updated 28 Aug 2026·2 pagesGCSE Physics Guide: Elasticity, Spring Constant, and Hooke's Law
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Elasticity and Spring Behaviour
Think about bouncing on a trampoline or stretching a rubber band - these materials can return to their original shape because they're elastically deformed. When you apply force to stretch, compress, or bend an object, it either springs back (elastic) or stays permanently changed (plastic deformation).
Springs are brilliant for studying this because the changes are easy to see. However, every material experiences these forces - even when you stand on the floor, it's applying an equal upward force to keep you from falling through it!
To measure how much a spring stretches, scientists look at extension - the difference between the spring's natural length and its stretched length. The key thing to remember is that there's always an equal but opposite force acting upwards, which is why loaded springs don't just fall down.
Quick Tip: The spring constant tells you exactly how many newtons of force you'd need to stretch an object by 1 metre - the higher the number, the stiffer the material!
2
of 2
Hooke's Law and Elastic Potential Energy
Hooke's law shows us that force and extension are directly proportional - double the force, double the stretch. This relationship works perfectly until you reach the elastic limit (or limit of proportionality), where the material can't bounce back anymore.
The magic formula F = ke connects everything together: Force equals spring constant times extension. This straight-line relationship only works in the elastic region - after that, the graph curves and the material becomes permanently deformed.
When you stretch a spring, you're storing elastic potential energy inside it. Think of it like a bow and arrow - the energy you put into pulling the string back gets released when you let go. This stored energy can be calculated and shows how much work was done to stretch the object.
Remember: The area under a force-extension graph gives you the elastic potential energy stored in the spring - this is why understanding graphs is crucial for physics calculations!
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Physics119 views·Updated 28 Aug 2026·2 pagesGCSE Physics Guide: Elasticity, Spring Constant, and Hooke's Law
R
Rafi@raf1
Ever wondered why springs bounce back or why some materials snap when you stretch them too far? Understanding elasticity and Hooke's law explains how objects respond to forces and why some materials are stretchy whilst others are rigid.
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Elasticity and Spring Behaviour
Think about bouncing on a trampoline or stretching a rubber band - these materials can return to their original shape because they're elastically deformed. When you apply force to stretch, compress, or bend an object, it either springs back (elastic) or stays permanently changed (plastic deformation).
Springs are brilliant for studying this because the changes are easy to see. However, every material experiences these forces - even when you stand on the floor, it's applying an equal upward force to keep you from falling through it!
To measure how much a spring stretches, scientists look at extension - the difference between the spring's natural length and its stretched length. The key thing to remember is that there's always an equal but opposite force acting upwards, which is why loaded springs don't just fall down.
Quick Tip: The spring constant tells you exactly how many newtons of force you'd need to stretch an object by 1 metre - the higher the number, the stiffer the material!
2
of 2Sign up to see the content. It's free!
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Hooke's Law and Elastic Potential Energy
Hooke's law shows us that force and extension are directly proportional - double the force, double the stretch. This relationship works perfectly until you reach the elastic limit (or limit of proportionality), where the material can't bounce back anymore.
The magic formula F = ke connects everything together: Force equals spring constant times extension. This straight-line relationship only works in the elastic region - after that, the graph curves and the material becomes permanently deformed.
When you stretch a spring, you're storing elastic potential energy inside it. Think of it like a bow and arrow - the energy you put into pulling the string back gets released when you let go. This stored energy can be calculated and shows how much work was done to stretch the object.
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