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[bombsinphysics-blog]

MORE PULLEYS!!! This reminds me of one of the pulley systems that we did in class.  Less force means more distance.

[theslumdogstudent-blog]

On Friday, we did a lab on the efficiency of a pulley. Concepts involved include:

Effort – The force supplied by the person using the machine

Resistance – The force which the machine applies to the load

Effort Distance – The distance which the person using the machine moves the machine

Resistance Distance – The distance which the machine moves the load.

[pattylight25-blog]

Good posting, simple but gets the point across as to the factors of a pulley system and what they are called. Also the animation is good.

[bombsinphysics-blog]

Well just another great roadrunner video.  If this actually worked the coyote would have gone FAR.  He pulls himself back on the bow much farther than he would have been able to...before his leg fur comes off.  

[bombsinphysics-blog]

At first I didn't see where this video was going with the bikes but then when they went to the divers I saw what a great example both the bikes and divers were.  The bikes were an example oh how they had to use a certain amount of energy to move their weight and the bikes and then how they went down.  The divers were obvious.  their potential energy at the great height that they were at equaled their speed just as they were about to hit the water.  

[bombsinphysics-blog]

As we all saw Bro. Harris do this in the Iona open house to an unsuspecting victim we all know how this is an excellent example of conservation of energy.  The bowling ball can not get any more energy than what was put in so it can not smash his head in.  

[bombsinphysics-blog]

Once again another great Coyote and roadrunner clip about physics.  this clip shows what we are beginning to talk about in class with potential to kinetic energy.  This involves the compression and decompression of springs that seriously screws the coyote.  

[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.

[ionaphysics-blog]

But can he hit the target

[tbans-blog]

All this talk of work reminds me of something my elementary school textbook once said. The introduction to the went something like this: You might say “Reading a complicated book is hard work!” However, a scientist might respond “Well, that depends.” You would reply “On what?” He would say “On how many times you had to turn the pages.”

I don’t know why, but I never forgot that fictional discussion from my sixth grade textbook. It always bothered me that the scientist had to twist such an inane comment to into an annoying conversation starter. Anyway, it does provide a clear differentiation between the colloquial and scientific definitions of the word “work.” In everyday speech, we define work as anything difficult or tedious whether it be physical or mental. In science, work is the product of the force exerted on an object and the distance travelled. 

[bombsinphysics-blog]

Again emphasizing that lifting shows power.  

[taylorgangorphysics-blog]

I know this is a bit of a throwback to uniform circular motion, but this posed a question to me (not involving James Bond): does UCM involve work? I became curious when I thought that there was force, and distance in a rotating system; however, I also began to think that perhaps there was a difference because the distance could be canceled out because the object in question returned to its original position.

[bombsinphysics-blog]

Haha 

[bombsinphysics-blog]

This video reiterates what Mr. Love said about work and movement.  He said that movement must be present for work to be done.  The example that he used was with pushing a wall how no work was being done even if he pushed with all his might.  Here they use one person just sitting still but studying hard and another person swinging but relaxing.  

[bombsinphysics-blog]

This reminds me of the example that Mr. Love did in class with the desk.  The object is being lifted up so the force is being applied up on the object but the pbjects weight is going down.  

[bombsinphysics-blog]

This Road Runner and Wiley Coyote episode contains many events involving momentum, kinetic, and potential energy and many other things that we have been looking at in recent chapters.  Gravity is also an ever present factor here, as well as the compression of springs resulting in bad news for the coyote.  

[physicsphilosophizer-blog]

Inelastic Collisions

In physics, it is important to distinguish between elastic and inelastic collisions.  An inelastic collision is a collision where kinetic energy is lost.  The kinetic energy is decreased and some of it was converted to thermal energy.  Objects made of soft or sticky material act in this way.

[physicsphilosophizer-blog]

Pole Vaulting in Physics?  This weekend kicked off the beginning of the indoor track and field season.  And after my competition I wondered how is physics involved in my pole vaulting.  It turns out that when a pole-vaulter bends a pole some kinetic energy is converted to elastic potential energy.  Then when the pole unbends the elastic potential energy is converted into kinetic energy throwing the vaulter up and over high crossbars.  I doubt I’ll think of pole vaulting the same anymore.  

It is amazing how with the invention of flexible poles and further incorporation of physics the world records have skyrocketed!  In 1896, before bending poles, the Olympic world record was 10’ 6” and today the world record is over 20’.

[bombsinphysics-blog]

Another video that reiterates a lot of the things we have learned about momentum.  

[bombsinphysics-blog]

In honor of the junior class trip to West Point today I decided to do something with momentum and guns.  As can be seen in the system (gun and bullet) there is a large amount of recoil when the gun is fired due to the high speed and caliber of the bullet.  As a result both the gun and the bullet go in opposite directions at high speeds.