Ever wondered how your phone's battery stores energy or why... Show more
Physics278 views·Updated Jun 3, 2026·3 pagesComprehensive Mind Maps for Forces & Energy Changes in Physics
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Work Done and Forces
Work happens whenever you apply a force to move something - whether it's pushing a trolley or lifting a book. The key thing to remember is that both force AND movement must occur for work to be done.
Forces come in two main types that affect our daily lives. Contact forces occur when surfaces touch, like friction when you rub your hands together. Non-contact forces work from a distance - think about how magnets attract metal or how gravity pulls objects downward.
Weight and mass often confuse students, but they're quite different. Your mass (measured in kg) stays the same whether you're on Earth or the Moon - it's simply how much matter you contain. Your weight (measured in Newtons) is actually a force created by gravity pulling on your mass.
💡 Quick Check: Your mass is 60kg everywhere in the universe, but your weight changes depending on the planet you're on!
The formula W = mg helps you calculate weight, where 'g' represents Earth's gravitational field strength . Gravitational potential energy (GPE) stores energy in objects based on their height - this explains why a book on a high shelf has more stored energy than one on the floor.
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Energy in Springs
Springs store energy in a completely different way from objects at height. When you compress or stretch a spring, you're storing elastic potential energy that wants to spring back to its original shape.
The formula EPE = ½ke² calculates this stored energy. Here, 'k' represents the spring constant - essentially how stiff your spring is. A large spring constant means you've got a really stiff spring that's hard to stretch, whilst a small spring constant indicates a soft, easily stretched spring.
Hooke's Law governs how springs behave with the simple relationship F = ke. This means the force needed to stretch a spring is directly proportional to how far you extend it. Double the extension, and you'll need double the force.
💡 Real-world Connection: The spring constant also appears as the gradient on a Hooke's Law graph - the steeper the line, the stiffer the spring!
This relationship holds true until you reach the elastic limit. Push beyond this point, and your spring won't return to its original shape - it becomes permanently deformed.
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Hooke's Law in Practice
Understanding elasticity helps explain why some materials bounce back whilst others don't. Elastic materials like springs and rubber bands change shape when forces act on them, then return to their original form when the force disappears.
Deformation occurs in two main ways that you can observe easily. Stretching happens when you pull on something, like extending a rubber band. Compressing occurs when you squash materials together, such as pressing down on a sponge.
The beauty of Hooke's Law lies in its predictability - until you reach that crucial elastic limit. Below this point, doubling the force will exactly double the extension. This direct proportional relationship makes spring behaviour highly predictable and useful in engineering.
💡 Exam Tip: Remember that Hooke's Law only works within the elastic limit - beyond this point, the spring won't return to its original length!
This principle explains countless everyday objects, from car suspension systems to measuring scales. The spring constant essentially tells you the 'personality' of your spring - whether it's going to be easy to stretch or put up a fight!
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Physics278 views·Updated Jun 3, 2026·3 pagesComprehensive Mind Maps for Forces & Energy Changes in Physics
Ever wondered how your phone's battery stores energy or why trampolines bounce you back up? Physics explains these everyday phenomena through work, forces, and energy changes. Understanding these concepts will help you make sense of everything from lifting your backpack... Show more
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Work Done and Forces
Work happens whenever you apply a force to move something - whether it's pushing a trolley or lifting a book. The key thing to remember is that both force AND movement must occur for work to be done.
Forces come in two main types that affect our daily lives. Contact forces occur when surfaces touch, like friction when you rub your hands together. Non-contact forces work from a distance - think about how magnets attract metal or how gravity pulls objects downward.
Weight and mass often confuse students, but they're quite different. Your mass (measured in kg) stays the same whether you're on Earth or the Moon - it's simply how much matter you contain. Your weight (measured in Newtons) is actually a force created by gravity pulling on your mass.
💡 Quick Check: Your mass is 60kg everywhere in the universe, but your weight changes depending on the planet you're on!
The formula W = mg helps you calculate weight, where 'g' represents Earth's gravitational field strength . Gravitational potential energy (GPE) stores energy in objects based on their height - this explains why a book on a high shelf has more stored energy than one on the floor.
2
of 3Sign up to see the content. It's free!
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Energy in Springs
Springs store energy in a completely different way from objects at height. When you compress or stretch a spring, you're storing elastic potential energy that wants to spring back to its original shape.
The formula EPE = ½ke² calculates this stored energy. Here, 'k' represents the spring constant - essentially how stiff your spring is. A large spring constant means you've got a really stiff spring that's hard to stretch, whilst a small spring constant indicates a soft, easily stretched spring.
Hooke's Law governs how springs behave with the simple relationship F = ke. This means the force needed to stretch a spring is directly proportional to how far you extend it. Double the extension, and you'll need double the force.
💡 Real-world Connection: The spring constant also appears as the gradient on a Hooke's Law graph - the steeper the line, the stiffer the spring!
This relationship holds true until you reach the elastic limit. Push beyond this point, and your spring won't return to its original shape - it becomes permanently deformed.
3
of 3Sign up to see the content. It's free!
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Hooke's Law in Practice
Understanding elasticity helps explain why some materials bounce back whilst others don't. Elastic materials like springs and rubber bands change shape when forces act on them, then return to their original form when the force disappears.
Deformation occurs in two main ways that you can observe easily. Stretching happens when you pull on something, like extending a rubber band. Compressing occurs when you squash materials together, such as pressing down on a sponge.
The beauty of Hooke's Law lies in its predictability - until you reach that crucial elastic limit. Below this point, doubling the force will exactly double the extension. This direct proportional relationship makes spring behaviour highly predictable and useful in engineering.
💡 Exam Tip: Remember that Hooke's Law only works within the elastic limit - beyond this point, the spring won't return to its original length!
This principle explains countless everyday objects, from car suspension systems to measuring scales. The spring constant essentially tells you the 'personality' of your spring - whether it's going to be easy to stretch or put up a fight!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Similar content
Most popular content: Elastic Potential Energy
2Most popular content in Physics
9Most popular content
9Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
AnnaiOS user