Thursday, May 22, 2014

Top 10 Blogs of 2014




#10: Acceleration and Velocity

 This was my number 10 favorite because this was one of the very first things that I learned in physics and I fully was able to grasp its concept due to the fact that I could relate it back to my favorite sport which was track. I chose to use a video as my medium which allowed me to visibly show the difference between velocity and acceleration. In a video I was also able to see a step to step progression as Usain Bolt began accelerating and then running with constant acceleration.



#9: Newton's 1st Law of Motion
Newton's 1st law of motion states that an object in motion, stays in motion unless acted on by an outside force and an object at rest stays at rest until acted on by an outside force. This is key because later on in physics we needed to fully understand this concept because this idea returned when we were discussing throwing a ball up in the air.

#8: Center of Mass vs. Center of Gravity
When discussing center of mass, you must understand that it is the average position of an objects mass. Center of gravity is when gravity is acting on that objects center of mass. These concepts interested me because as in my #10 blog, I was able to relate it back to something I enjoy doing, and that is playing football. A football player bends their legs because it now lowers their center of mass making it much harder to knock them over.




#7: Free Fall
When an object is in free fall, there is absolutely no air resistance. This was a difficult concept for me to grasp. The only thing pulling on the object is Earth's gravitational pull which it is accelerating to Earth at 9.8m/s^2 which as student we would automatically round to 10. If you were to drop a feather or a coin in free fall from the same height, which one would land first? EXACTLY! They would land at the same time.

#6: Torque
The concept of torque isn't my favorite thing about this word, but in fact the word is. Torque is equal to lever arm multiplied by force. This will give you the point in which a meter stick will rotate or help you solve for the weight of an object.

 #5: Work
The equation for work is equal to the force multiplied by the distance. To decrease the amount of force you need to apply on a box, one might use an incline or box and travel a greater distance. Work-in equals Work-out. That being said (Force-in)(Distance-in) = (Force-out)(Distance-out).

#4: Mousetrap Car Lab
The mouse trap car lab was a really big experiment that my classmates and I participated in. It incorporated alot of physics including fun. In order to make the mouse trap car actually go, we had to fully understand Newton's Laws and incorporate them into our project. This was a fun activity but yet I still feel like I learned so much from this.



#3: Polarization
I struggled alot with the concept of Polarization. I was confused with the order in which things would follow in order to be polarized. However, after grasping the concept I am now able to answer the question why does a balloon stick to the wall after someone rubs the balloon with their hair? The answer is simple and is polarization.
#2: Magnetism
I really enjoyed learning about this topic this year. I learned alot about magnetism that I didn't know prior to this class. For example I learned that in a Magnetic Field, charges flow from North to South and back up from South to North. I also learned about what made magnets stick together, and how to turn a paper clip into a magnet. Magnets exist because the domain in an object stops moving out of control and actually aligns up.



#1: Wind Turbines
The wind turbine lab was one of my favorite labs because my group and I created a wind turbine in a single day, having no idea what was going to end up happening. Having the deadline due that day and having exactly nothing done do to states, my group had to work fast. We began applying concepts together in order to make this wind turbine work and to my amaze, it worked. We had to "grok" closely with this project and make sure all the pieces worked well together and they did.




Wednesday, May 21, 2014

Wind Turbine

Materials:
  • Pipes
  • Thin wire to produce the coils
  • hot glue
  • 4 small magnets
  • PCV pipe 
  • 90 degree pipe
  • Cardboard and wooden rod (to make the propellers)
Pictures:

                    






















Results: 
Like all groups, we had to produce a voltage using a wind turbine. Although we didn't get started until Monday, it was still amazing to have finished it all in one day.


Wednesday, May 14, 2014

Unit 7

Magnetism

Magnetic forces are due to movement of charged particles and all magnets have a north and south pole.


Like charges,  magnetic poles can attract or repel without touching. Opposite poles attract and like poles repel. The space around a magnetic contains a magnetic field.


  • Magnetic fields, as seen above travels from north to south. 
  • Magnetic domains are a cluster of atoms rotating "out of control" 
    • Magnets work when these domains begin to align and rotate all in the same direction. 

Generators/ Transformers

A generator is a way to induce voltage by moving a coil. This is possible by rotating the cop in a stationary magnetic field. Generator take in mechanical energy and out put electric energy

  • Transformers are machines that transfer energy from a primary to a secondary circuit.
  • Transformers are used to keep current low, which produces less heat which in turn saves energy. It steps up or down voltage without changing energy.
  • Primary is the input and secondary is the output. Now if the primary and secondary have the same amount of turns the input and output alternating voltages will be equal. BUT if the secondary coil has more turns then the primary then alternation voltage in the secondary is greater than the primary thus the voltage must be "stepped up" and if the primary is greater than the secondary the voltage must be "stepped down".
  • The relationship between the primary and secondary voltages in relation to the number of turns is show by the following equation:
The rate in which energy is transferred is called POWER

  • (Voltage X Current)primary = (Voltage X Current)secondary


Thursday, May 8, 2014

Unit 6 Blog Reflection

Charges:

  • opposite charges attract
  • like charges repel
    • Three Ways to Charge an Object
      • Contact
      • Friction (steals electrons)
      • Induction (charge without electrons)
Polarization:
  • Coulomb's Law: the force between any two charges is inversely proportional to the distance
  • Conductors: allows charges to move throughout an object
  • Insulators: stop charges from passing through the object
(In the picture, you see the opposite charges attracting through polarization)
This process happens because:
  • Opposite charges attract this a negative charged balloon attracts to the positive wall which enables it to now stick on the wall. It's all about the spreading of charges. 
Voltage:
  • Voltage is the charge difference over a unit of charge which is also known as the potential difference

Motor Blog

The motor performs a few different tasks:
  • The Battery-Provides the electrical energy of the motor
  • The coil of Wire-Carries current.
  • The Paperclip-Connects and holds the coil of wire to the positive and negative ends.
  • The Magnet-Aligns electrons in wire.
Joey scraped the outside layer of the wire (which will rests on the paperclip) in entirety at both ends of the wire.  We did this because if there was a steady current flowing through the wire the motor would not turn all the way around.  It would turn to halfway and then stop.  We scraped half of one side and the whole of another, which made it so that the the current would be across the the magnetic field would be up and the force would turn the motor. Therefore the motor would not be turned back flat after it was spinning we stripped half it would not be pulled flat and it would continue to spin around.

The Motor turns because the current is down the wire, the electromagnetic force is up, and the force spins the motor sideways.  If the wire was completely striped the force would flip and it would spin back resting sideways; because half of the wire is striped, the current will stop and the coil will flip the rest of the way around until the current reconnects.  By this time when there force on the motor it be in the right direction to spin the motor.