SHMReview

# SHMReview - Phy 7C Review of Oscillations and t he SH M...

This preview shows pages 1–2. Sign up to view the full content.

Phy 7C Review of Oscillations and the SHM Model from Phy 7B Unit 7 Page 1 Oscillations and the Simple Harmonic Motion (SHM) Model (Review of material treated in Unit 7 of Physics 7B) Introduction Many physical phenomena exhibit “vibrations.” The everyday use of the word “vibrate” to mean that something moves back and forth, usually in a regular way, is very close to what is meant by “vibration” or “oscillation” in physics. When we examine objects that are oscillating, we notice several features. The motion repeats in a cyclic manner. As the object moves toward one extreme, a net force acts on the object, causing it to stop and move towards the opposite extreme. In order to make these ideas more precise we introduce a model of a very common kind of oscillation, called simple harmonic motion. Some oscillations occur with abrupt changes in an object’s motion. An example is a vertically bouncing ping-pong ball. Going down, the ball changes direction very rapidly when it hits the table. Going up, it gradually comes to a stop and then gradually begins moving down. In contrast, a swinging pendulum changes its direction at both ends of its swing in a very smooth way. This latter, very smooth oscillatory motion is called simple harmonic motion. Because this motion is so common, it is useful to formulate a simple harmonic motion (SHM) model. This model will become the starting point of a wave model taken up in Unit 8. The essential elements of the SHM model (as well as all other models) include constructs (the ideas that form the building blocks of the model), the relationships between the constructs, and the representations that allow us to readily use the model to develop explanations of various

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern