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In Motion and Forces that we've looked at all ready, the objects all need something to set them in motion or provide the force. They need Energy, we need energy to do stuff too (= Work) and how quickly we can do that stuff (= Power).
Energy comes in only two types - but those 2 types come in a multitude of forms.
Its hard to believe, but we can't make energy or destroy energy - however we are really good a changing it from one form into another.
Step 1 : Have a look at these videos as the 2 types of energy are introduced to you and you will meet some of the many forms too. You'll also meet some the equations that you'll be using later on in this topic. (Learn)
Mission 1 : Now go and complete the first bit of work on energy in your workbooks. The "Introduction to Energy" and "Energy Transformations" pages. (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
So potential energy is energy stored in something. Ever lifted something heavy onto a shelf? How about dropping something heavy onto your foot? If you answered yes to either or both of those then you know about the next sort of energy - Gravitational Potential Energy (GPE) Things that have height have more energy.
Step 2 : Have a look at these videos as they explain about GPE and how to calculate it. Don't worry about anything after 4.42 in the Bozeman Science video. (Learn)
Mission 2 : Now its your turn - complete the page on "Calculating Gravitational Potential Energy" in your workbooks. Don't forget to use the formula triangle to help you. Puzzled by m x g = F remember the equation F = ma, well in this case the a for acceleration is the acceleration caused by gravity or g. So we just swop the a in F = ma for the g and get F = m x g or F = mg. (Learn)
If you are still having issues around rearranging the potential energy equation I've made this video to try and show you 2 possible ways to rearrange it. Hopefully making it clearer and easier to rearrange the equation. (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
When something is moving we have active or kinetic energy doing stuff. But how do we figure out how much energy?
Step 3 : Watch as it is explained for you. (Learn)
Mission 3 : Now once again its your turn. Complete the "Calculating Kinetic Energy" page. (Learn)
There is something to notice here - they try to get us to slow down with all those safe speed driving ads. Try some of the calculations again .... but double the speed number = what do you notice?
Double the speed isn't double the energy ..... its QUADRUPLE the energy. Hitting something when going faster is going to hurt a whole lot more.
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
Don't try and tell me you have never ever pinged a rubber band across the classroom!
Mission 4 : Using your new skills at calculating potential and kinetic energy complete the page in your workbook about " NZSS Rubber Band Shooting Team" and their battle against the Aussies. (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
Step 4 : The kinetic energy equation can look a bit tricky to rearrange when you meed to find the mass of, or velocity of something. I've made this video to try and make it a bit easier - this is the way I do it. Just don't forget the little extra step to finish it off. (Learn)
Mission 5 : Now put that rearranging into practise as you complete the pages on "Using Kinetic Energy to Calculate Velocity" (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
Strange as it may seem we can't make energy from nothing, nor can we destroy energy. However we can transform it from one sort into another. Energy is never lost = it is just transformed into something else, commonly by friction. (heat, sound etc)
This is known as conservation of energy.
Playtime : how a go with the simulation of the pendulum (swing), use the "Energy" option. Watch where the energy goes as you adjust the friction level. Try messing with gravity if you wish. (Learn)
Mission 6 : Now put that knowledge to use as you complete the "Conservation of Energy" page in your workbook. (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
Remember the phrase "what goes up must come down" .... think about the energy types ..... as it the object goes up gravitational potential energy goes up but kinetic energy goes down. The opposite happens when the object comes down. Then just before it hits the ground all the potential energy has become kinetic .... where does the energy go then?
Watch the energy changes as you also learn to juggle. (Learn) (Share)
Mission 7 : Now juggling involves quite a bit of dropping - what sort of energy changes are going on then? Read and complete the page on "Dropping Balls" in your work book.
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
What about when you slide down a hill? What energy changes are going on then?
Watch as I ski down Mt Hutt = what energy changes can you see and hear? (Learn)
Mission 8 : Now calculate what is going on ..... you can use the page in the workbook "On The Mountain" and you can use my ski run too. My mass in my ski gear is 95kg, the height of the run is 476m and the length of the run is 1300m (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
How much energy goes into throwing a ball? How fast is fast?
Here is a look at baseball pitching ..... (Learn)
Mission 9 : Now try finding out the energies, heights and velocities as you complete the "Throwing Balls" page in your workbooks.
For those that want to find the energy that the pitcher puts into the ball here are the numbers you need. Mass of ball = 145 grams, Speed 106 mph = 170.59 kph. Don't forget that you need these numbers in kg and m/s. (Learn) (Share)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
It takes a lot of effort to throw a ball that fast, he's a professional baseball player = it is his job. But in Science we have a completely different definition of what "work" is.
Work is done when energy is transferred into an object and it moves. If it doesn't move then no work was done.
Step 5 : Watch as the Science concept of work is explained to you. (Learn)
Mission 10 : Now will you be doing work as you complete the pages on "Work" and "Work Problems" in your work book?
Don't forget to use the formula triangle to help you find which version of the equation to use. (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
How quickly do you work?
In Science we measure power by how fast the work get done = the quicker you do Work, the more Power is put out.
Step 6 : Watch as power is explained to you. (Learn)
Mission 11 : Now see how powerful your brain is as you complete the page on "Power" in your work books .
Don't forget to use the formula triangle to help you find which version of the equation to use. (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
328 m, 1103steps, 51 stories, 25 kg of gear (plus the participants own body mass eg 80 kg). The record 8 minutes 11 seconds.
This is the Sky Tower stair challenge fundraiser for Leukaemia.
Its also a measure of the power output of the Firefighters that take part. (Learn)
Challenge 1 : Now its your turn - perhaps not that many stairs but read and carry out the "Measuring Your Power" activity in your workbooks. (Learn)
Video your efforts and post it on your blogs. You could extrapolate from your time/height and estimate how long it would take you to climb the Skytower stairs. (Share)
If you don't have any stairs to use or can't physically do this = use the figures supplied with the Skytower challenge video and find how much power the record holder put out.
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
Mission 12 : Now put all that together and complete the "Power Problems" and "SciPad HQ" pages in your workbooks. (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
Now its time to put all this together : Potential Energy, Kinetic Energy, Work, & Power.
Lets see it all in action .... (Learn)
If you didn't spot all of : Potential Energy, Kinetic Energy, Work, & Power. Then you'd better watch this as well. (Learn)
Mission 13 : Still not got all that - go and practise as you complete "The Roller Coaster" page in your workbook. (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
Playtime : Try and build your own "Roller Coaster" by using this simulation - use the "Playground" option. Don't forget to put on the bar graph to see the energies in action.
Mission 14 : Time to wrap it up by going and completing the "Definitions" page at the start of the topic and the "Puzzle" page at the end. (Learn)
Done that? = Share with your teacher.
Yes = now its time for your next Step/Video clip/Challenge/Mission.
No = go back and complete the Step/Video clip/Challenge/Mission please.
Final Mission : Complete the "End of Chapter Review Questions" (Learn) (Share)
Final Final Mission : At the end of this topic there is also a practice exam that puts problems from all the 3 topics ( Motion, Forces, and Power,Work and Energy) together in the form of the type of exam you'll be sitting at the end of the year. Do a bit more revision and give it a go. (Learn) (Share)
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