Unit 8 Blog Post #2

Today in class, we went over more unit 8 topics. Mr. Blake taught us about power. Power is the rate at which something is done. The equation for power is change energy over change in time. This is simplified to work over time. The unit for power is joules over seconds, also called watts (w). We learned that power is directly related to energy and inversely related to time.

In this picture, there is a light bulb on a lamp. Power in light bulbs is measured by kilowatt hours. Mr. Blake told us that "energy companies" should really be called power companies because the companies supply power no energy.

At the end of class, we worked on our bottle rockets. We got to launch our bottle without any attachments. Alex and I launched the rockets three times. The first time we filled it up a little more than half of water. We launched the rocket went for about 1.5 seconds. Our second rocket we had less water and our rocket went up for about 3 seconds. On our third with less water, our rocket went up for just about 5 seconds. Now we have a general idea how much water to add.