Today we continued learning and reviewing about energy and work. We also learned about power. Power is the rate at which work is done. Power is equal to the change in energy divided by the change of time or work over time. The units for power is Joules divided by seconds or watts (w). So, if you get a word problem containing force (N) and distance (m) and time (sec), you can find the power because Force x Distance equals work and then you can divide work by time. There are also many variations of the example that I just gave.
1.
2.
2.
3.
4.
4.
As you can see in the pictures above, a green object is falling from my desk to the ground. In the picture 1, the green object starts at the top of my desk and has gravitational potential energy. As it falls in pictures 2 and 3, the object loses gravitational potential energy and gains kinetic energy because gravitational potential energy and kinetic energy are inversely related. In picture 4, when the object is right about to hit the ground, the object has a kinetic energy equal to the original gravitational potential energy in picture 1.
You had really good explanations for power and how to find it. They were worded simply, which made it all the more understandable. I also really liked your pictures. They, along with your explanations, explained the relationship of kinetic energy and potential gravitational energy really well.
ReplyDeleteYour pictures of the falling green object, along with the explanation, were really clear and understandable. Your earlier explanation of power was really informative and clear, as well.
ReplyDeleteYour pictures are AWESOME and great job with your explanation. It's concise but full of clear information. It's obvious that you know what your talking about !
ReplyDelete