Physics (Energy)

Welcome to the physics portion of the course!

I know many of you think "Physics" is a very dark, scary subject. I was very much looking forward to proving you wrong!! It would be more exciting to do so in person but I still think I can show you from here that physics is not as scary as you think. All I ask is you give me a chance to do so. Keep an open mind and if you find yourself getting stuck, ask a friend or shoot me an email.

So what is Energy? It is thought that the total amount of energy in the ENTIRE UNIVERSE is constant. Energy can take different forms, and when we change energy from one type to another type we say we are doing Work. Energy is in literally everything you see and do.

This class will focus mostly on the following types of energy:

• Kinetic Energy (movement)
• Gravitational Potential Energy (things that can fall)
• Thermal Energy (Heat)
• **Note - Kinetic and Potential energy together are referred to as Mechanical Energy

Your assignment today is firstly to watch these two short videos:

• https://www.youtube.com/watch?v=CW0_S5YpYVo (very general overview of energy)
• https://www.youtube.com/watch?v=FX7T-QYTPho (types of energy)

Then, please submit between 5 and 10 different real life situations where energy is changing from one form to another.

• For example, in the second video we see a roller coaster LOSING potential energy and GAINING kinetic energy
• The video also shares an example of gas in a car. The car is LOSING chemical energy from gas and GAINING kinetic energy.
• One last example from the video is when fireworks explode, where they are LOSING chemical energy (stored in the explosives) and GAINING light energy, sound energy, and heat energy.
• Please do NOT use examples from the video in your assignment.
• Get creative! There are literally infinite answers.
• Click here to submit your situations (up to 10, at least 5).
• Just like last time, the assignment will be closed tomorrow (Thursday) at 3pm. Let me know if you have any questions!

Intro to Energy Quiz Key

Since there are unlimited options for this I cannot provide an answer key. I am looking for any situation where energy changes from one form to another, excluding the examples already given in the videos. I look forward to reading all of your answers!

**Quick note: This week has been rather hectic. In the future my goal is to post all assignments by 10am sharp on Mon/Wed, and post answer keys at 3pm sharp on Tues/Thurs. However, NEXT WEEK Monday is a holiday! So I will be posting assignments Tues/Thus and answers Wed/Fri.**

Happy Easter everyone! I hope everyone had a great long weekend with the lovely weather.

Today we are learning about a specific type of energy - kinetic energy. This is the energy of movement. You can calculate the kinetic energy of ANY object if you know the mass and the speed (or velocity) of the object.

The equation for kinetic energy is E­_k = ½ mv²

• E­_k is the symbol for Kinetic Energy
• ½ is just equal to 0.5
• m is mass and it must be in kilograms (kg)
• v is speed or velocity and it must be in meters per second (m/s). Don't forget to square v!

Energy is measured in Joules (J)

Your assignment today:

• Watch this great video on kinetic energy: https://www.youtube.com/watch?v=WrFCHt21kVA
• If you want to see an example calculation with a bit of algebra to find v, watch here: https://www.youtube.com/watch?v=i2mMsH-60aE&t=13
  • This is like question 5 in the quiz!
• Complete the quiz here: https://forms.office.com/Pages/ResponsePage.aspx?id=RtUantX4ek-GDic4Z6NToHvA1yWui35JqXQhGpKbVXJURUhHUjE0VVNJTTc2WVRZRk01R0dKRkxGNC4u
  • The quiz will close on Wednesday April 15th at 3pm.

Hello Everyone, I hope you are all safe and healthy.

Today's lesson is on Potential Energy. There are actually lots of different types of potential energy - it is just stored energy. Many things store energy such as:

• Batteries
• Gasoline
• Springs
• Nuclear Reactor Fuel

These all store a lot of energy. However, when you lift something you are also storing energy because when you drop it it will spend that stored energy to go faster and faster. Lifting something stores gravitational potential energy which we will be focusing on today.

The equation for gravitational potential energy is E_p = mgh

• E_p is the symbol for gravitational potential energy (measured in Joules)
• m is mass and it must be in kilograms (kg)
• g is the gravitational field strength and it is almost always just equal to 9.8
• h is the height from the ground and it must be in meters (m)

Your assignment today:

• Watch this great video on gravitational potential energy
  • Most important part starts at 2:50 in the video
  • https://www.youtube.com/watch?v=rNS-W7k0jts
  • Here is a video with some example problems for reference https://www.youtube.com/watch?v=x5JeLiSBqQY
• Then, please answer these questions: Click Here for Quiz

Happy Monday everyone!

I hope everyone had a safe and healthy weekend. Today we are putting together all the Energy knowledge we've gained so far to explore one of the most important topics in all of physics: Conservation of Energy. The good news is you've already worked on this! The last question on our previous quiz had Georgia jumping off a diving board and ALL her Potential Energy converted into Kinetic Energy. This is the most important idea - energy cannot be created or destroyed, it can only change forms. So (if we ignore air resistance) it MUST be true that all of her potential energy at the top of the diving board turned into kinetic energy!

Today:

• Please watch these videos to get a better understanding of conservation of energy
  • https://www.youtube.com/watch?v=H6D_ViW0Ch4 (Overview)
  • https://www.youtube.com/watch?v=HEqY77RHnV0 (Really well done example problem)
  • https://www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/v/conservation-of-energy (another explanation with an example - optional video)
  • I will also make an example video of the question from last class if I have time.
  • Remember the TOTAL amount of energy DOES NOT CHANGE.
• Then, please complete your Quiz for today through MS Teams
  • As usual, the quiz will close at 3pm tomorrow.
  • If you have any questions please post them in the "Chat or Ask A Question" channel or message me directly through teams. I have the audio figured out for my screen recordings so I should be able to answer questions in detail if needed!

Today's lesson is on Thermal Energy from Friction and how it relates to Conservation of Energy. Heat will always be on the "Ef" or "Energy Final" side of the equation. Please watch the video below and complete the assignment through MS Teams. Message me directly or post in the other channel if you have any questions!

Thermal Energy Quiz Key

Today we have a very important class that involves NO calculations! We are looking at the TYPES of energy we humans collect for ourselves to use in our homes and businesses as electricity!

In your assignment today (on MS Teams) I have listed some commonly known types of energy:

• Kinetic
• Thermal
• Gravitational Potential
• Chemical Potential (Anything you burn uses this to make heat)
• Nuclear Potential
• Elastic Potential
• Radiation (Light)
• Sound

Your task is to look at each way we generate electrical energy and decide which TYPE of energy are we harvesting in each case. I'll give you a free answer and an example here - Wind power generation is harvesting KINETIC energy because the wind is moving and we turn that movement into electricity. Another tip for you - anything that burns is using chemical potential energy to create heat. Good luck and let me know if you have any questions!

Firstly, if you haven't watched the "Graphing Energy Types Over Time" video (below) please watch it now!!

Secondly, below is your final project for the Energy unit. I would have liked to do this in school with the whiteboards but you guys are so creative I'm looking forward to seeing your videos. *Please read the document carefully and let me know if you have any questions. I will host a tutorial/discussion session at noon on Wednesday (tomorrow) so bring your questions!*

Lastly, if you are having a difficult time with the Energy unit this project can be made very simple! Pick a situation with only two energy types, such as a snowboarder going down a hill. If you are having a fun time with the Energy unit then challenge yourself by thinking of a situation with 3 or 4 different types of energy!