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[missionperu]

[hornerthomas-blog]

You guys look like you are doing a lot and having a lot of fun! We are keeping you in our prayers. -Period B Physics 

[hornerthomas-blog]

Energy

This week we learnt about Energy. When the roller coaster cart is traveling in a constant horizontal motion at the top of a roller coaster, it has potential energy but no kinetic energy. When the cart is in vertical motion, it has no potential energy, but it has kinetic energy.

[hornerthomas-blog]

This article doesn't relate to energy, but it relates to Kepler's law. NASA may be able to find more planets that rotate around a different sun. It would be cool if NASA was able to find more planets that are able to sustain human life.

[hornerthomas-blog]

On Monday we did a lab. This lab was to help us better understand IMA and AMA. We would used pulley systems to measure the efficiency. The more simple the pulley system was, the great the efficiency was. 

[maxberdik-blog]

Looks like an interesting lab.  And when you say simple, do you mean smaller in size or simply less complex?

I mean less complex. The more complex pulleys wrap around more times than the less complex pulleys

[hornerthomas-blog]

On Monday we did a lab. This lab was to help us better understand IMA and AMA. We would used pulley systems to measure the efficiency. The more simple the pulley system was, the great the efficiency was. 

[13fiort-blog]

A roller coaster is a perfect example of the law of conservation of energy.  The height times the mass of cars times gravity gives the potential energy before the ride starts, which is the entire energy of the system.  On the ride the energy is not gained or lost(unless acted on by outside forces) but is just transformed between potential and kinetic energy.  If at the end of the ride, the roller coaster cant achieve its original height, it can be concluded that energy was lost along the ride.  

[hornerthomas-blog]

On a roller coaster, wouldn't you have to take friction into consideration?-Thomas Horner

[hornerthomas-blog]

Everything is equal!

This week we learnt that most of the equations we have learnt in the pass tie together. When you rearrange the variables, you can set many different equations equal to each other.

[hornerthomas-blog]

This week we learnt about conservation of energy. Energy can't be destroyed or created, it can only be transformed. There are many formulas to prove this such as  E=PE+KE, KE(before)+PE(before)=KE(after)+PE(after), Ea+Eb+Ec+Ee+Ef+Eg+=KE+PE, and v=(square root of) 2KE/m.

[hornerthomas-blog]

Yesterday we were introduced to Potential energy. Potential energy is the amount of energy referred to the the position of 2 objects. Potential Energy (PE) is energy in the stored state and is able to do work. PEg is the potential energy needed to lift  the object against the force of Gravity. For PEg the Formula is PEg=mgh=W=Fd. We also realized that all of the equation we have used so far, are tied together.

[hornerthomas-blog]

This week we learnt and did a Lab on work and power. One equation that we learnt was P(power)=W(work)/t(time). We also learnt that W=f*d. The SI unit for work is J and the Si unit for Power is Watts.

[jumbojetryan-blog]

this week we did a lab on power generation by students in our class. were were able to find the horsepower, wattage and foot pounds per second generated by all of the students. to find the amounts of power generated you needed to find the vertical distance of the stairs, the weight of the student in lbs and the time it took to travel the vertical distance. most students were able to generate less than 1 horsepower with a few able to generate more.

[hornerthomas-blog]

That lab was a lot of fun and i hope we do more fun labs. -Thomas Horner

[hornerthomas-blog]

Today we did a lab in which we calculated the power generated by every student. after getting our weight, the distance of the run, and the time, we were able to calculate the horsepower, ft*lb/s and watts.My weight was 138lb the distance was 16.3 and my time was 3.7s. This means i had 608 ft/s, 1.105 horsepower and 823.8 watts. The picture above is one of the 2 flights of stairs we had to run up to conduct this experiment.

[maxberdik-blog]

On Friday we watched a video where a man jumped off a cliff and literally flew down the face of a mountain (see video).  The video demonstrates many aspects of physics, like gravity, air resistance, mass, surface area, acceleration, distance, etc.  It is amazing how Corliss is able to keep himself composed throughout the flight, because if he tucks his arms in too close to his body, his surface area will no longer be great enough to glide, and he will plummet to the ground.   

[hornerthomas-blog]

That looks like so much fun. I wish i could try it.-Thomas Horner

[hornerthomas-blog]

This week we learnt about momentum and Impulse. We learnt that cars are made of bendable material so that when you get into an accident, the front of the car increases the amount of time of the collision. Also, the air bags increase the time of the collision to make the passengers safe.  

[hornerthomas-blog]

Today we took a quiz in class. The quiz was on Impulse. We were given the formulas F(delta)t=(delta)p=m(delta)v and M1v1+m2v2= (m1+m2) v  to figure out the unknown variable. While taking the test it was important to use sig figs, direction and units. 

[hornerthomas-blog]

At the beginning of the week we did a lab. In the lab we learned what the momentum-impulse theorem is and how to use it. The momentum-impulse theorem is (delta p)=(m)(delta v)=(F)(delta t).

[hornerthomas-blog]

This is a short clip of an inelastic collisions. This is an inelastic collision because momentum is conserved but kinetic energy is not conserved, but lost in the form of heat.