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we're not kids anymore.
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Jules of Nature
"I'm Dorothy Gale from Kansas"
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@13joses-blog
good job guys! missionperu:
Our first day of service saw us in Canto Grande. This poor barrio (called a ‘pueblo joven’ in Peru) is on the outskirts of Lima. It is there that the Christian Brothers run a school called ‘Fe y Alegria 26’, one of a system of schools funded by the government but run by religious communities which…
Great job on what you guys are doing. We are praying for you. Thank you guys.
good job guys! missionperu:
Our first day of service saw us in Canto Grande. This poor barrio (called a ‘pueblo joven’ in Peru) is on the outskirts of Lima. It is there that the Christian Brothers run a school called ‘Fe y Alegria 26’, one of a system of schools funded by the government but run by religious communities which…
good job guys! missionperu:
Our first day of service saw us in Canto Grande. This poor barrio (called a ‘pueblo joven’ in Peru) is on the outskirts of Lima. It is there that the Christian Brothers run a school called ‘Fe y Alegria 26’, one of a system of schools funded by the government but run by religious communities which…
Great jobs on what you are doing. We are praying for you in Peru. We well see you in America in a week!
In class, we went over efficiency. Efficiency of a machine is the ratio of useful energy output to total energy input. There is no machine with a 100% efficiency. We went over the questions that we finished for homework. We determined AMA, IMA, and efficiency for different systems. There are no units for AMA and IMA since they are ratios. Merry Christmas!!
Christmas Physics
We were putting up our Christmas tree today, and the most important thing I could find to think about was, of course, physics. I imagined how much easier it would have been to lift the tree up if we had a pulley system which would reduce the necessary force by increasing the distance that we pulled. Physics is very important to the Christmas spirit, there’s no way Santa could deliver all those presents without clever use of the laws of gravity.
Thank you Steve for this Christmas Physics Spirit! A pulley makes work easier as we learned and observed in the lab. We could try to find out the AMA and IMA for a pulley system when lifting up a Christmas tree. Merry Christmas!
In class, we learned about actual mechanical advantage. We learned it was a ratio of a output force to the input force of a machine. AMA= output F/ input F. Mechanical Advantage tells you how many times the machine multiplies force you put into a machine. IMA= D in/ D out. Efficiency is equal to the W out/ W in. (AMA/IMA) The ideal mechanical advantage is the ratio of output distance to input distance of a machine. Three types of simple machines include the lever, pulley, and incline.
In class, we learned about machines. A machine is a device for increasing a force and changing the direction of a force. The work input is equal to the work output. The Force* distance is equal to the Force * distance. If you decrease the Force, you have to increase the distance to get the same work output for the other side of the equation.If the force is lessened, it was easier to pull up the weight in the lab. We then took a quiz and I found the velocity at different points of the pig down down a hill.
In class, we went over the conservation of mechanical energy. The formula states that KE before + PE before= KE after + PE after. We went over a problem with roller coasters. We found out the potential energy and velocity at specific points on the ride. On Friday, I preformed a pulley lab with Alex Warn and Edward Garrity. We fixed the apparatus for the pulley and we measured force, effort, and resistance. The lab report will due after the Christmas break!
In class, we went over some review problems. We learned about the conservation of energy and we learned that when energy changes from one form to another, there is no net loss or gain. Total mechanical energy is the sum of the potential and kinetic energy. The sum of Potential energy and Kinetic energy remain constant for all positions of an object in a system. We formula for mechanical energy on a system is E=KE+PE. We also learned KE before +PE before= KE after+ PE after.
Today we learned about the conservation of energy, we learned that kinetic energy plus potential energy equals total energy. As seen in the diagram each and every point has the same total but different values, all ofwhich depend upon the height of the object from a defined point.
Yes, the conservation of energy is when energy changes from one form to another, there is no net loss or gain. The sum of Potential Energy and Kinetic Energy remains constant for all positions of an object in a system. The energy is also called the total mechanical energy in the system. Great picture also of what we did in class!
In class, we did practice problems with Kinetic Energy. We learned about potential energy and that is the energy of position. It must refer to the relative position of 2 objects. We learned the chemical energy is the potential energy located in the bonds of molecules. We learned that gravitational potential energy was PEg. It is the work that was required to elevate the object against gravity. The formula for gravitational potential energy is PEg=mgh. PEg is also the work that was required to displace a given distance. PEg depends on the weight on an object and the height of its elevated position. In the picture, the massive ball pulled back and the stretched bow have potential energy.
Today in physics class we performed a lab regarding work. Each student in the class ran up the stairs like Jesse here. These times were recorded, and using the students’ weight in Newtons we calculated how much “work” was done.
This lab was very unique in that we were able to perform work by running up the stairs. We were able to also calculate the power, horsepower, and power in watts. We were able to compare our results in the lab with the google docs spreadsheet and Kyle had the highest power. The shorter the time, the higher the power value. Very nice photography by the photographer!!!
In class, we learned that power is the work done divided by a time interval. The unit for power was Watts(W) or J/s. Power is the rate at which work is done or energy is transformed. It is equal to work done or energy transformed per unit of time. The formula is P=w/t. If you twice the force, you twice the power. If you twice the time, you halve the power. The conversion of 1 hp= 0.7 kW and 1 hp =700 W was used in practice problems. Mechanical energy is the property of an object that enables it to do work. Kinetic energy is the energy of motion. Kinetic energy depends on an object's mass and its velocity. We also discussed about the work-energy theorem.
In class, we learned about work. Work is the product of the Force on an object and the distance it is moved. The formula for work is W=Force * distance. The unit for work is Joule or N*m. Work occurs on an object if a force is exerted on the object and the object moves a distance. We did an example problem and discussed that if the force is changing over time, you can find the work done by plotting force vs displacement (distance). The work done is the area under the curve. We reviewed for the test and went over all the formulas such the one for momentum and the ones for elastic and inelastic collisions. The test was good for me on Wednesday! This picture shows the object is moving and has a force acting on and therefore work is being done.
In class, we discussed the homework sheet about momentum and inelastic and elastic equations. We started to do our lab. It was nice for all of us to leave the classroom and go to the stairs. In this lab, we measured the power production of ourselves. We were also able to see other student's results. We took note of the time it took a person to climb two flights of stairs. We used the work= force * distance and the power=work / time in our calculations and conversions. We also found our horsepower by doing conversions. It was nice to understand there is work and horsepower involved in a normal event of life such as running up some stairs.
Today in physics we discussed impulse, which is essentially a change in momentum. In can be expressed as a force multiplied by the time the force is in action, or as an object’s mass multiplied by its change in velocity. Because there are various ways to calculate impulse, it can get a little tricky at times, but as long as one remembers the equation in the picture, it’s a lot easier.
Yes, this picture equation is really helpful when doing Impulse problems. I used this formula on the quiz and it helped me a lot. On the test on Wednesday, I hope to use this equation again for some problems. The change in p could also be = m(Vf-Vi).
In class, we reviewed the questions we had done for homework. This helped us prepare for the quiz which we took. I had some trouble understanding number 77, but I was able to get it. We said that it was also good to draw diagrams of p initial and p final. One box describes what is happening for the initial momentum and one box describes what is happening to final momentum. In this video, the egg on the bed sheet lived because it changed its momentum over a long time period experiencing a small force. The egg in the wall stops in a short time and requires a large force.
