Changes in energy (article) | Energy | Khan Academy (2024)

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  • cutieprincess

    10 months agoPosted 10 months ago. Direct link to cutieprincess's post “it says that if one objec...”

    it says that if one object loses energy then another object gains that energy, so if you're sick and you lose some energy where does it go?

    (15 votes)

    • Abdulloh

      10 months agoPosted 10 months ago. Direct link to Abdulloh's post “When energy is lost, it i...”

      Changes in energy (article) | Energy | Khan Academy (4)

      Changes in energy (article) | Energy | Khan Academy (5)

      When energy is lost, it is usually converted into heat1. For example, when waste and dead matter are broken down by decomposers, the nutrients are recycled into the soil to be taken up again by plants, but most of the energy is changed to heat during this process1. However, the energy is still present in the system as kinetic energy. To bring the system to rest, the kinetic energy of the system must be transferred to some other part of the system1.

      (28 votes)

  • calebjaimes

    a year agoPosted a year ago. Direct link to calebjaimes's post “i like how math help the ...”

    i like how math help the earth but not me.

    (19 votes)

  • MorganH

    a year agoPosted a year ago. Direct link to MorganH's post “Does velocity matter in t...”

    Does velocity matter in transfer of energy

    (12 votes)

    • Meng Fan

      a year agoPosted a year ago. Direct link to Meng Fan's post “Yep! There is a formula f...”

      Changes in energy (article) | Energy | Khan Academy (11)

      Yep! There is a formula for Kinetic energy that says KE = half of your mass times your velocity squared (1/2 m v^2). So if two rocks both transfer all their energy somewhere, and both have the same mass, but one of them has a much greater velocity, then the one with the greater velocity will transfer more energy! This makes sense if you think about how much of a splash you can make in a pond by throwing a rock much harder (more velocity) or much softer, for example.

      (10 votes)

  • chanel.lee

    7 months agoPosted 7 months ago. Direct link to chanel.lee's post “If energy didn't exist, h...”

    If energy didn't exist, how would it change our lives today?

    (10 votes)

    • Artist

      7 months agoPosted 7 months ago. Direct link to Artist's post “We would probably not mov...”

      We would probably not move and be nothing.

      (9 votes)

  • violet.emmons

    a year agoPosted a year ago. Direct link to violet.emmons's post “If energy can’t be create...”

    If energy can’t be created how does it form

    (12 votes)

  • Lewis

    a year agoPosted a year ago. Direct link to Lewis's post “This comment section is w...”

    This comment section is way better, back in the biology section the comments section literally just turned into a censored, cuss-free version of reddit

    (11 votes)

  • The Legend of Darkstalker

    a year agoPosted a year ago. Direct link to The Legend of Darkstalker's post “If water freezes and beco...”

    If water freezes and becomes ice, will it have the same weight as before? (i know that its different volume and mass, but how about weight) ? pls explain

    (6 votes)

    • James

      a year agoPosted a year ago. Direct link to James's post “#Meow🤣, anyways *yes*, t...”

      #Meow🤣, anyways yes, the water would have the same mass as the ice because no matter the form of anything it will always be the same mass or have the same mass.

      Sorry I'm 17 Days late but Hope this helps! :)

      (6 votes)

  • IsabellaB

    a year agoPosted a year ago. Direct link to IsabellaB's post “if you have two of the sa...”

    if you have two of the same mass of a ball and one faster why would that be ^-^

    (7 votes)

    • Nkisu

      a year agoPosted a year ago. Direct link to Nkisu's post “because though they have ...”

      because though they have the same mass they have different speed

      (3 votes)

  • Wine Htet Htet Maung

    3 months agoPosted 3 months ago. Direct link to Wine Htet Htet Maung's post “If energy cannot be creat...”

    If energy cannot be created, why does it exist in the first place?

    (6 votes)

    • Kobi

      3 months agoPosted 3 months ago. Direct link to Kobi's post “*Answer*:When the unive...”

      Answer:

      When the universe was created, the protons, neutrons, and electrons needed for atoms and molecules already existed. Hydrogen is made up of 2 protons and 2 electrons. When it fuses, it creates heat energy and light energy. That energy came from the atom, and that energy came from the protons and electrons that already existed before the universe was born. When it fuses, it also creates a new element: Helium. This creates a buildup of new physical elements, and slowly that universe will turn from empty proton space into a large amount of atoms that can create stars, galaxies, and nebulas, which all will create new things. Energy is basically an infinite family tree with no beginnings.

      (4 votes)

  • Ganso

    a month agoPosted a month ago. Direct link to Ganso's post “nice how do i become pote...”

    nice how do i become potential energy

    (4 votes)

    • Limbo

      a month agoPosted a month ago. Direct link to Limbo's post “Find Master Wu. He'll hel...”

      Find Master Wu. He'll help you reach your true potential.

      (5 votes)

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