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Please note you no longer have access to the scoresheet, you will get viewing rights again next week once some settings have been changed. All participation grades for the week are now set and no further changes will be made.

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Micheal: when you move your legs you are pushing your mass forward slightly (when you straighten your legs) and backwards slightly (when you bend your legs) this change of mass in the direction of your movement helps to speed up the movement (fighting gravity) since force is dependant on mass. Here is a short article that explains it in more detail. You will however constantly be slowed down due to air resistance and gravity pulling you down, so eventually you will run out of potential energy and need to push off the ground again to give you more starting energy.

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Edward:I see you were able to open the document. It is only for Tuesday, if you want to start it now you can, as long as you have finished your notebook updates. You will however need to wait for my video explaining the energy conversions on the last table on page 2, as this is Tuesday's work.

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Leo and Edward: the amount of friction would depend on what the surface was made of (as you said Edward), putting the slider in the middle just represents a moderate amount of friction, moving the slider down means it's more slippery, moving it up means it's more rough. In this experience you can change the amount of of friction since it's a simulation. In real life you  could change the amount of friction by either by putting water/ice/oil on it (less friction) or putting sand/salt/an adhesive on it (more friction). You can obviously  also change it by rebuilding it from a different material.

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Why does swing your legs on a swing help you move and never stop?

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sorry one of the anonymous was me, i just signed in

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In addition, how do we do Friday's PHET worksheet? Do we make a copy of the document and then do it? Currently the document is on view only.

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I see, so friction is a constant rate?

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Edward- friction does depend on what type of surface you are on, the smoother the surface the less friction it has also I don't believe friction decrease or increase, I think friction decreases our speed but I think it stays the same.

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Does friction depend on what type of surface you are on? So for example, if I were to skate on a surface made out of rock and a surface made out of wood, would the friction increase or decrease at exactly the same rate?

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Leo: I would assume that in the middle of the slider is what is in real life. The slider goes from "none" to "lots" so probably like "usual" would be in the middle. I'm really just assuming here.

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When we go to playground or friction in the energy skate park there is a slider for friction so where should the slider be to have the amount of friction we encounter in real life.

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Please note: if you did not sign in or put your name next to your post, you haven't been credited for that post, you will need to screenshot it and then post it as a picture here once you have signed in or email it to me.

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Hazel and Jessica: an object that is not moving and is lying on the floor can have zero energy (no potential energy)

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Willman and Alex: if something in space is within the gravitational pull of another object, then it has potential energy, everything in our solar system has potential energy because of the gravitational pull of the sun. The amount of potential energy it has would depend on it's distance to the sun or any other object.

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Saaransh and Karsten: when you hit something, you transfer the momentum or force, from one object to another. In your example, this would result in both people feeling the force of an object (reaction force) and some energy being transferred into heat and sound. An easier example would be to think of two cars colliding, the force of the impact  stops their forward movement; some of the kinetic energy is transferred in an opposing force, which may push the cars away from each other, some of the force/energy will cause the metal of the cars to bend, and some of the energy will be transferred into sound (loud bang), and heat from the friction between the wheels and the road, and the two cars.

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Ruby: please look at my answer to Ankul above about potential energy on different floors, as it doesn't apply if you are just sitting in your apartment.

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Elizabeth and Hazel: breathing involves moving muscles in your chest, your body uses energy to do this, it is kinetic energy (movement), your body uses your energy stores in your muscles to do this.

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Lindsey: excellent answer to Saaransh's question about the car!!

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Anonymous, please let me know who you are!

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Arnold and Hazel: you will use less of your stored energy during sleeping hours, as your body is doing less work

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Willman, The kinetic energy is at its greatest point when the pendulum is at its lowest point because that is where the pendulum is moving the fastest.

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Fung Leo Chan: Since we are learning about potential and kinetic energy, of course it is related. The fuel on the rocket provides kinetic energy that shoots the rocket out into space. When the rocket is high above ground, kinetic turns to potential. I hope this answers your question-

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When a pendulum is swinging, when is the kinetic energy at its greatest point? - Willman

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Willman:  There are energy in space too so yes it has potential energy. But it might be different kinds of potential energy.

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Hazel: if an object doesn't move, there will be no kinetic energy instead it will have potential energy because when it doesn't move, the energy is stored.

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Willman: Everything in this world or the universe has potential energy.

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Hazel: if an object dosen't move, then yes it will be potential energy because it isn't moving.

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Ruby: If you were to fall off your balcony onto the actual ground floor, you would have more potential energy than the person falling from the 3rd floor because you are higher off the ground than them. But if you're talking about your apartment floor, then no, you don't have more potential energy than them. - Willman

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Brandon: The glass bottle has potential energy in it, so when you drop it, it turns into kinetic energy.

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-Vivan

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How do you make different loops in the skate park

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What happens with the energy when you drop a glass bottle on the floor?-Brandon

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Do objects have potential energy in space? (outside of Earth) - Willman

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Which I anwsered with the kinetic energy turning into sound energy the moment that it hit the son's face

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Because it dosen't go in the son's face

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You said the energy from the dad's slap(Kinetic energy) happens when it hit his son's face

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quote unquote

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If a kids dad slaps his kid really hard what happens when the energy from the dads slap goes onto the kids face?

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Karsten: I asked how is the energy transferred from the dad's hand to the son's face. Did you even read my question how is the food and water the dad drinks and eats related to how the energy is transferred from the dad's hand to the son's face I did not ask about the movement of the dad's hand?

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if an object doesn't move at all, does it still have potential energy

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Ruby: yes because if you fall then you will have more kinetic energy compare to when you are falling from 3rd floor

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Saaransh: The dad uses energy, from food and water, to slap his son's face, casuing kinetic and sound energy. (The movement of the hand and the sound of the face slap)

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So if I am living on the 4th floor, am I having more potential than the 3rd floor? -Ruby

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Satyadeep - There isn't much total energy when the mass is small because gravity doesn't need a lot of energy to pull down the skater.

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Why is the total energy very less when the mass is small?

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Leo: Unless there is an obstacle in front of the skater, the skater will keep on skating.

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Leo: yes it will keep on continuing because there is not anything to stop the skater

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Without friction will the skater keep skating forever?

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Elizabeth: no you make potential energy

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When you're breathing do we make kinetic energy?

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Martin: The potential energy converts to kinetic energy when movement happens.

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If a kids dad slaps his kid really hard what happens when the energy from the dads slap goes onto the kids face?

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Saaransh: the brakes stop the acceleration of the car so, the kinetic energy turns into thermal energy (friction). Because of that, the car decelerates and stops. Energy cannot be created or destroyed, only changed. Therefore, whatever amount of kinetic energy you had is the same amount of thermal energy now.

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when a guy is driving his car at a speed of 120 kmph and he has to make a sudden brake what happens to all the kinetic energy made from the speed he was driving on and how much thermal energy is made by making that brake?

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Saaransh: When the person gains altitude, the total energy (potential energy) increases, and potential energy is being transformed into kinetic energy the same time.

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Saaransh: When a guy is climbing up a mountain, kinetic energy is used, but it starts to become potential energy when it comes to an end.

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when a guy is climbing up a mountain what kind of energy is he using to go up?

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what about when it lands what happens to the kinetic energy

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Where does the energy for life processes come from?-William

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Long Kui : when an object falls, PE will convert into KE.

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when an airplane is in the sky does it store potential energy to land on the ground and when it lands does all the kinetic energy go away right away or does it slowly go away after a few minutes of landing on the ground and moving on the landing road.

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Jun:It affects our life in many different ways, for example: If you are shooting a bow, the more an archer pulls back, the more potential energy will be gained, when the bowstring is released, the arrow moves forward really fast.

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How do we keep track of energy flow thru our bodies?

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Ankul: if you are sitting in your apartment, you do not have gravitational potential energy just from living on the higher floor, however, anything you had to drop out of your window would immediately have potential energy to fall 56 stories right before you drop it, and if you and a friend on a lower floor were both dropping something out of your windows, the higher object would have more PE. If that same object is sitting on the floor of your apartment, with no chance of falling, it will have a potential energy of zero, as potential energy can only be gained by changing its location or potential to fall. You, on the other hand, always have potential energy (chemical potential energy) simply because you are alive and you eat, your body stores energy from the food you eat and that energy is what keeps you alive and lets you move.

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What happens if PE converts into KE ?

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Ankul : I mean you will always have potential energy no matter where you are.

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do all the machines have both KE and PE just control by the on off button?

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ok thanks

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Ankul SIDANA: yes you have more potential energy than the people who live on the 1st floor

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no, because i live on the 56th floor, it is very high, so that can mean i have potential energy right?

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Ankul: No it does not mean that you have a lot of potential energy  just because you are living there.

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if i live in the 56th floor, does that mean i have a lot of potential energy

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Ngai Tat SO: there's kinetic energy when you move during sleeping.

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If we are sleeping, does that mean that we are storing potential energy

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Please make  sure that you don't repeat questions that have already been answered. Those of you who have poor participation so far may want to answer these, the more detail in your answer the better!

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is there any cases that potential energy and kinetic energy are not together

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Why is Radient energy a kinetic energy?

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what does potential energy depend on

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Everyone please note: you are expected to work on science EVERY B DAY, which means you should have completed two days of work by now, as outlined in this document. The instructions for what to do each day are clearly laid out, so you shouldn't wait until Friday every week and rush through the work, if you are trying to do this you have not read the instructions and I have emailed your parents to say you have done NO science for four days. The later submission date is only to allow students who are outside Hong Kong an allowance for time differences or Google access problems.

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Is radiant energy and solar energy related? If so, how and in what way?

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How is kinetic energy related to potential energy?

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Sunny and Isabella: yes, radioactive energy is transferred into electrical energy in nuclear power plants in a process called nuclear fission. It is an excellent, clean source of energy and much better for the planet than fossil fuels.

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Here is your participation score so far. I will check for the last time tomorrow and then enter a grade of Consistent or Inconsistent as a participation grade for week 1. If you have a 5: you are awesome! Thank you for your hard work. If you have a 4: great job so far! If you have 3: you have done the bare minimum, repeated questions or haven't given any scientifically valid answers to another student, try get your score up! If you have 2 or below: no effort, you will get an inconsistent grade if there is no improvement by tomorrow afternoon.

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Is nuclear energy a good alternative for fossil fuel?

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Is radioactive one example of nuclear energy? And can nuclear energy transfer to electrical energy?

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IMPORTANT: If any of you are in contact with the following people via any messaging system, please ask them to email me TODAY to let me know why they have been absent/not working this week: 701: Vivan, Edison, Kaitlyn, Max, Willman. 702: Micheal, William. 703: Brandon, Saaransh, Hazel, Ruby, Grace. All of their parents will be getting emails today from me.

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Ankul, neither, kinetic energy is the amount of movement an object is experiencing

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Ms Pringle, does kinetic energy make a object faster or slower?

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Thanks Ms Pringle I was really confused

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Some great questions yesterday everyone! I'm really glad to see that some of you are taking the time to think deeply about this content; your answers  to each other have shown me a good level of understanding and engagement. I encourage you all to read through what has been discussed so far, and to use this forum as a means to ask bigger questions; don't  just type the first thing you think of (which has probably been asked multiple times already). I'll share some more info with you tomorrow (day B) about the different types of  KE and PE and how conversions take place in different scenarios.

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Eleanor: if you drop the skater through the air, there is still friction because of the air. Air resistance slows falling objects down and causes them to heat up, especially over long distances (from great heights). The air resists their motion and coverts some of their kinetic energy into thermal energy, which is why asteroids or spacecraft entering into our atmosphere burn up/get super hot as they are falling.

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Elizabeth: if the skateboard is stuck to the ramp, it's potential energy would be zero, because it has lost its potential to move. In your next question: potential energy and kinetic energy are inversely proportional as you should have seen in the bar graph on your skate track, and as Eleanor explained..

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Arnold and Siya: there is potential energy without gravity,  just not in the skater example. There are other other types of potential energy besides gravitational potential energy, eg. chemical, nuclear elastic  (scroll up to  the picture I added yesterday).

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Arnold: the energy  from skating could only generate a small amount of power in the wheels, as the skater will  stop  after a short time. If you think of a waterfall though, the falling water is definitely able to power things (hydroelectric power) as this a very strong, continuous force

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Witty: your pencil question: if the pencil is not moving and not on the edge of  the desk, it has no potential energy, the energy transfer when you pick it up is not the pencil's energy, it is your energy, potential energy in your body is converted into kinetic energy in your muscles as you pick it up. If the pencil falls off the table though, it would have potential energy due to it's height above the floor, which would convert to kinetic energy when it falls off (potential energy in this case is due to position).

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Keona: this has been answered multiple times, please scroll up

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Edward: the activities are not even due yet, so sometime next week.

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Rachel: yes, when we eat, we store energy (potential) when we exercise we release it, this has been answered before

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Witty and Lindsey: all energy is either potential or kinetic, and any time work is done it involves the transfer of energy from one type/form of energy to another.