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Energy Conservation and Efficiency Notes for Kids: Examples, Formulas, and More!

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Energy Conservation and Efficiency Notes for Kids: Examples, Formulas, and More!

Energy Conservation and Calculations in Physics - A comprehensive guide covering the fundamental principles of energy conservation, different energy stores, and practical calculations.

• The law of conservation of energy states that energy cannot be created or destroyed, only transferred between stores
• Eight main energy stores exist: Gravitational, Thermal, Elastic, Chemical, Kinetic, Magnetic, Electrostatic, and Nuclear (GTECKMEN)
• Key calculations include gravitational potential energy (GPE = mgh) and kinetic energy (KE = ½mv²)
• Efficiency and power calculations demonstrate practical applications of energy transfer
• Work done calculations show the relationship between force and distance

...

1/30/2023

595

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

View

Gravitational Potential Energy and Kinetic Energy Calculations

This section focuses on practical applications of gravitational potential energy GPEGPE and kinetic energy KEKE formulas through example problems.

Example: A bungee jumper with a mass of 80kg is lifted 60m in a crane. The GPE is calculated as follows: GPE = mgh = 80kg × 10N/kg × 60m = 48,000J

Example: The kinetic energy of a 1400kg car traveling at 15m/s is calculated as: KE = ½mv² = 700 × 225 = 157,500J

The page also covers calculations involving speed and mass conversions, demonstrating the versatility of these energy formulas in various scenarios.

Highlight: The four main energy pathways are mechanical, heating, radiation, and electrical current MR.NEMR.NE.

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

View

Work Done and Force Calculations

This section explores the concept of work done and its relationship with force and distance.

Definition: Work done is measured in joules JJ and is calculated using the formula: Work done = Force × Distance

The page presents several example problems demonstrating how to calculate force, distance, and work done using this formula.

Example: To calculate the force acting on an object if the work done is 50J and the object moves 25m: Force = Work done ÷ Distance = 50J ÷ 25m = 2N

Example: To find the distance an object has moved if the work done is 88J and the force is 11N: Distance = Work done ÷ Force = 88J ÷ 11N = 8m

These examples illustrate the practical application of the work done formula in various physics scenarios.

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

View

Efficiency in Energy Transfers

This section discusses the concept of efficiency in energy transfers and how it is calculated.

Definition: Efficiency is a measure of how well an object outputs useful energy compared to how much energy is taken in. It is calculated using the formula: Efficiency = Usefulenergyoutput÷TotalenergyinputUseful energy output ÷ Total energy input × 100%

Highlight: Some energy is always wasted, so nothing can ever be 100% efficient.

The page provides a visual example of energy transfer in a light bulb, showing how electrical energy is converted into light and thermal energy, with some energy wasted as sound.

Example: In a light bulb that converts 60J of electrical energy into 6J of light energy, the efficiency is calculated as: Efficiency = 6J÷60J6J ÷ 60J × 100% = 10%

This example demonstrates how to calculate efficiency and interpret the results in real-world applications.

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

View

Power Calculations in Physics

This final section focuses on power calculations and their relationship with energy and time.

Definition: Power is measured in watts WW and is calculated using the formula: Power = Energy ÷ Time

The page presents several example problems demonstrating how to calculate power, energy, and time using this formula.

Example: To calculate the power when 200J of energy is transferred in 30 seconds: Power = Energy ÷ Time = 200J ÷ 30s = 6.67W

Example: To find the energy transferred when a 30W device operates for 60 seconds: Energy = Power × Time = 30W × 60s = 1800J

These examples illustrate the practical application of the power formula in various physics scenarios, reinforcing the relationship between energy, time, and power.

Highlight: 1 watt is equal to 1 joule per second, which is a fundamental unit conversion in power calculations.

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

View

Power Calculations

This section covers power calculations and their practical applications.

Definition: Power equals energy divided by time P=E/tP = E/t, measured in watts.

Vocabulary: 1 watt equals 1 joule per second

Example: For 200J of energy over 30 seconds, power = 6.6W

Highlight: Power calculations are essential for understanding energy transfer rates in practical applications.

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Energy in the home

 

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Jan 30, 2023

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6 pages

Energy Conservation and Efficiency Notes for Kids: Examples, Formulas, and More!

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@motivatedstudies

Energy Conservation and Calculations in Physics - A comprehensive guide covering the fundamental principles of energy conservation, different energy stores, and practical calculations.

• The law of conservation of energystates that energy cannot be created or destroyed, only transferred... Show more

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

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Gravitational Potential Energy and Kinetic Energy Calculations

This section focuses on practical applications of gravitational potential energy GPEGPE and kinetic energy KEKE formulas through example problems.

Example: A bungee jumper with a mass of 80kg is lifted 60m in a crane. The GPE is calculated as follows: GPE = mgh = 80kg × 10N/kg × 60m = 48,000J

Example: The kinetic energy of a 1400kg car traveling at 15m/s is calculated as: KE = ½mv² = 700 × 225 = 157,500J

The page also covers calculations involving speed and mass conversions, demonstrating the versatility of these energy formulas in various scenarios.

Highlight: The four main energy pathways are mechanical, heating, radiation, and electrical current MR.NEMR.NE.

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

Sign up to see the contentIt's free!

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Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Work Done and Force Calculations

This section explores the concept of work done and its relationship with force and distance.

Definition: Work done is measured in joules JJ and is calculated using the formula: Work done = Force × Distance

The page presents several example problems demonstrating how to calculate force, distance, and work done using this formula.

Example: To calculate the force acting on an object if the work done is 50J and the object moves 25m: Force = Work done ÷ Distance = 50J ÷ 25m = 2N

Example: To find the distance an object has moved if the work done is 88J and the force is 11N: Distance = Work done ÷ Force = 88J ÷ 11N = 8m

These examples illustrate the practical application of the work done formula in various physics scenarios.

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

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Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Efficiency in Energy Transfers

This section discusses the concept of efficiency in energy transfers and how it is calculated.

Definition: Efficiency is a measure of how well an object outputs useful energy compared to how much energy is taken in. It is calculated using the formula: Efficiency = Usefulenergyoutput÷TotalenergyinputUseful energy output ÷ Total energy input × 100%

Highlight: Some energy is always wasted, so nothing can ever be 100% efficient.

The page provides a visual example of energy transfer in a light bulb, showing how electrical energy is converted into light and thermal energy, with some energy wasted as sound.

Example: In a light bulb that converts 60J of electrical energy into 6J of light energy, the efficiency is calculated as: Efficiency = 6J÷60J6J ÷ 60J × 100% = 10%

This example demonstrates how to calculate efficiency and interpret the results in real-world applications.

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

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Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Power Calculations in Physics

This final section focuses on power calculations and their relationship with energy and time.

Definition: Power is measured in watts WW and is calculated using the formula: Power = Energy ÷ Time

The page presents several example problems demonstrating how to calculate power, energy, and time using this formula.

Example: To calculate the power when 200J of energy is transferred in 30 seconds: Power = Energy ÷ Time = 200J ÷ 30s = 6.67W

Example: To find the energy transferred when a 30W device operates for 60 seconds: Energy = Power × Time = 30W × 60s = 1800J

These examples illustrate the practical application of the power formula in various physics scenarios, reinforcing the relationship between energy, time, and power.

Highlight: 1 watt is equal to 1 joule per second, which is a fundamental unit conversion in power calculations.

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Power Calculations

This section covers power calculations and their practical applications.

Definition: Power equals energy divided by time P=E/tP = E/t, measured in watts.

Vocabulary: 1 watt equals 1 joule per second

Example: For 200J of energy over 30 seconds, power = 6.6W

Highlight: Power calculations are essential for understanding energy transfer rates in practical applications.

10.11.22 physics LAW OF CONSERVATION OF ENERGY The idea that energy cannot be created or destroyed, and it can only be transferred from One

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Law of Conservation of Energy and Energy Stores

The law of conservation of energy is a fundamental principle in physics stating that energy cannot be created or destroyed, only transferred between different stores. This concept is crucial for understanding energy transformations in various systems.

There are eight main stores of energy, which can be remembered using the acronym 'GTECKMEN':

  1. Gravitational potential energy
  2. Thermal energy
  3. Elastic potential energy
  4. Chemical energy
  5. Kinetic energy
  6. Magnetic energy
  7. Electrostatic energy
  8. Nuclear energy

Definition: Gravitational potential energy GPEGPE is the energy stored in objects that are high up. It is calculated using the formula GPE = mgh, where m is mass in kg, g is gravitational field strength in N/kg, and h is height in meters.

Example: A hairdryer converts electrical energy into thermal energy.

Vocabulary: Elastic potential energy is stored when an object is stretched, squashed, or twisted. It is calculated using the formula Elastic PE = ½kx², where k is the spring constant and x is the extension.

Highlight: Kinetic energy is the energy stored in moving objects and is calculated using the formula KE = ½mv², where m is mass and v is velocity.

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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 S

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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 Klich

Android 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.

Anna

iOS user

I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️

Thomas R

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Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades

Brad T

Android user

Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍

David K

iOS user

The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!

Sudenaz Ocak

Android user

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Greenlight Bonnie

Android user

I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend

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Marco B

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This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!

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