PHYSICS

yes

[lukeypotatoes]

BREAK

merry Christmas and happy new year

[lukeypotatoes]

Tuesday Posting

On Tuesday we went over some more notes. We talked about AMA which is the ratio of output force to input force of a machine. AMA= outputF/inputF. IMA is the ratio of output distance to input distance of a machine. IMA=Din/Dout. There are three types of Machines: lever, pulley, incline. Efficiency is the the ratio of useful energy output to total energy input. Efficiency = Wout/Win=AMA/IMA. NO MACHINE HAS 100% EFFICIENCY!!!!!!!

[lukeypotatoes]

Monday Posting

Today we went over some homework problems and started learning about machines. A Machine is a device for increasing force. It also can change the direction of the force. Work input = work output. W=E=KE=PE. After those notes we took a quiz which i completely AC'ED. (y) Go Gaels 

[lukeypotatoes]

Friday Posting

On friday we conducted a lab. We looked at how pulleys would change the effort required to lift the weight. Effort was the force supplied by the person using the machine and Resistance is the force which the machine applies to the load. AMA=Resistance/Effort

IMA= Effort distance x Resistance distance

Efficency = (AMA/AMA)x 100%

[nickragone-blog]

Mechanical Energy

The mechanical energy of a system is equal to Kinetic Energy + Potential Energy. When this mechanical energy is conserved, the energy that is present before the event is equal to the energy present after. PEg = mgh     KE = 1/2mv^2

[lukeypotatoes]

Lukeypotatoes:

  remember the total mechanical energy remains the same throughout. 

[lukeypotatoes]

Today we started talking about the conservation of energy. When energy changes from one form to another, there is no net loss or gain. Energy CANNOT be created or destroyed. Energy can only be transferred. Total mechanical energy  is the sum of the potential and kinetic energy together. This can be seen through a roller coaster. The total mechanical energy remains constant. This change in potential energy is shown in billy being at the top of the hill and then converting his PE to KE.

[lukeypotatoes]

Here is a simple picture of the one they call "THE HAWK" hunting with his bow and arrow. This bow has a lot of potential energy stored with it. There is also Gravitational Potential energy which is the work that was required to elevate the object against gravity. The formula of that is PEg=mgh. Potential energy and kinetic energy both play important roles with each other.

[lukeypotatoes]

Friday Posting

On Friday we took notes and did a couple of problems. We talked about power and Mechanical Energy. Mechanical energy is the property of an object that enables it to do work. Energy is measure in Joules. Kinetic Energy depends on an objects mass and its velocity. KE=1/2mv^2

[lukeypotatoes]

Tuesday Posting

On Tuesday we reviewed for our exam the next day. We did some example problems and reviewed our notes. Mr. Love then told us the formulas we needed to know: Pbefore=Pafter, P=mv, J=FxT= change in P, m1v1+m2v2=m1v1'+m2v2', m1v1+m2v2=(m1+m2)v',W=FxD, P=w/t=(FxD)/t, and KE= 1/2mv^2.

[go-gales-blog]

monday posting

We had a lab on monday  where we measured power. It was measured in Watts horse power and foot pounds per second. WE found this  with weight  the distance traveled and the time it took to travel. My personal power was .8018. But as you can see from the picture luke’s horse power was greater at.919 just look at the form

[lukeypotatoes]

LukeyPotatoes:

your right Bryan the form is key into creating more horsepower

[lukeypotatoes]

On Monday we performed an experiment that involved Power. We ran an experiment where we tested our speed running up a flight of stair and how our weight would affect our Power. We found that people with more weight and fast times generated the fastest times. Bryan was pretty slow but what are you going to do. Kyle ended up generating the most HorsePower.  

[lukeypotatoes]

On Thursday we took some notes and also review our homework. After that we took a quiz that was on momentum. I forgot to post this picture but i found it and it is a prime example of how physics works and how athletic Bryan Fay truly is.  

[lukeypotatoes]

Wednesday Posting

On Wednesday we started talking about the types of collisions we might see. Two collisions we talked about are Elastic and Inelastic collisions. An elastic collision is one where 2 objects collide and bounce apart with no less energy and the object retain their original shapes. An inelastic collision is a collision in which objects collide and some mechanical E transformed into heat and object deform in the collision and do not return to their original shape. 

[vmart95-blog]

In class this week we learned about impulse.  Impulse is a change in momentum.  An equation to find the impulse of an object is J=FΔt.  In baseball if you decrease the contact time between the bat and the ball during a bunt, you will create a small impulse.  But, if you swing and hit a homerun the contact time will between the bat and the ball will be longer, therefore creating a greater impulse.

[pattylight25-blog]

This is a good video because it relates what we rare learning in class to a sport that we can all relate. It makes it a little easier to understand when is it related to something your familiar with. Too bad no one would hit a home run off vin cause he would strike them all out but still a informative video.

[lukeypotatoes]

LukeyPotatoes:

This video is cool because it is a real life example of physics in action, it also taught me the importance of a follow through. 

[lukeypotatoes]

Tuesday Posting

We started off class today by reviewing our old momentum notes and then started laerning new things. We reviewed the many relationships for momentum and looked at a ton of formulas that we can use to calculate momentum. We then talked about impulses. An impulse is the product of force and the the time interval over which it acts.

[lukeypotatoes]

Break post

Over the break I had a lot of time to myself so i started looking at youtube videos. I started watching funny videos that had horrible accidents that amused me. There was a video that I saw where it had a bunch of car accidents. I started to think about there collisions from a phyics point of view. I watched the speeds of the cars, the size of the cars, and weather it was a head on or side ways collision. http://www.youtube.com/watch?v=XEqyv0-Bpos

[lukeypotatoes]

Tuesday posting

On Tuesday we went over some problems relating to collisions. We went over our homework and the lab. We reviewed some important equations that we would constantly see throughout the chapter. I also helped Bryan out cause he was understanding it, but that's just what a Gael does to help another Gael.