Today we learned about Resonators, Standing waves, and Harmonics. For resonators, there are two key terms. Those being Nodes, the stationary region, and Antinodes, where the amplitude is the largest. There are also two types of resonators, which are open and closed piped resonators. Open piped resonate when the length is an even # of quarter wavelengths. and closed piped ones resonate when a length is an odd number of quarter wavelengths.
AP Physics Journal 18
Today in class we talked Mach speed, gravitational force, and red and blue shifts. Mach speed is the speed of sound through a medium. This is equivalent to an object traveling at 343 m/s^2. When something is going Mach x, that is just x times Mach. When talking about Mach speed the term “g’s” is also talked about. This just simply means the amount of atmospheric pressure put on an object. so 4 “g’s” means that four times the amount of gravity is being applied on an object. Red and Blueshift describe how frequency is either increasing or decreasing. When you say something is Red shifted that means the frequency is being decreased and vice versa.
AP Physics Journal 17
Today in Ap Physics we learned about the Doppler Effect. The Doppler effect is when there is a change in pitch due to the relative motion of the source or receiver. The easiest example of this is when a car is approaching on the highway the car is loud and as it passes it gets quieter. This effect happens to any type of wave.
AP Physics Journal 16
Today we learned about sound in AP Physics. The origin of sound actually comes from the vibrations of material objects and then the original vibration will then transfer into something larger. Pitch is when the frequency of the vibrating source equals the frequency of the sound waves produced. Also on average, a person can hear a pitch from 20 Hz to 20 KHz. Any pitch under 20 Hz is called infrasonic and any pitch over 20 KHz is called ultrasonic.
AP Physics Journal 15
Today in class we learned about waves. There are two main types of waves that many subcategories. Those two main waves are Mechanical and Electromagnetic waves. The main difference between the two is that mechanical waves require a medium while electromagnetic waves do not. There are also two subcategories of mechanical waves. those being Transverse and Longitudinal waves. Transverse is when the particles are perpendicular to the wave, while longitudinal is when the waves are parallel.
AP Physics Journal 14
Today we learned about vibrations, simple harmonic motion, and pendulums. This is important because these are more major topics that will be on the AP exam. There are 2 things when it comes to pendulums.
- The object is subject to a restoring force that will accelerate it towards an equilibrium position.
- When the pendulum is displaced from its place of rest, the restoring force will cause the pendulum to oscillate about the equilibrium position.
AP Physics Journal 13
Today in Physics we learned about Static equilibrium and Torque. There are 4 main points used in statics and torque. Statics and Torque are a major topic that will be covered on the AP exam.
- use center of mass for objects
- choose a convenient axis of rotation (typically at an unknown force)
- sign convention: counterclockwise is positive; clockwise is negative
- system of equations
AP Physics Journal 12
Today we learned about rotational energy, work, and power. Rotational is very similar to normal energy problems except for a few differences. The first big change is that Vi is not the same for all particles but the angular acceleration is, which is symbolized by the lowercase omega.
AP Physics Journal #11
Today in Class we continued to work on forces problems. It is very important to draw a COMPLETE free body diagram and if you don’t do this you won’t be able to do the problem. You also have to make sure you have to have the correct number of free body diagrams. for Instance, if there is a pully problem you have to make sure you have a one for the pully and the weights attached to the pullies.
Learning Log 112
In problems 2‑94 and 2‑109 you worked on developing a general method that can be used to sketch the graph of any sinusoidal function. One such method is outlined in the following Math Notes box. In your Learning Log, use your own words to write a set of steps that can be used to graph a sinusoidal function. Include an example. Title this entry “Transforming a Sinusoidal Function” and include today’s date.
In order to transform Sinusoidal functions to the left or right, you have to either add distances from the unit circle, such as ∏ or 2∏. You have to be aware when you want to move it right you have to subtract and not add. To move the function up or down you either have to add or subtract the value that you want to move it. In order to Horizontally stretch it, you have to multiply the x by a value. In order to vertically stretch you have to multiply the “(x – h)”.
August Durlacher 