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SPAA 260, Section 1

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by: Molly O'Keefe

SPAA 260, Section 1 SPAA 260

Molly O'Keefe
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About this Document

These are the notes from the first week of classes
SPAA 260
Dr. Shaffer
Class Notes
speech pathology




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1 review
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"I'm really struggling in class and this study guide was freaking crucial. Really needed help, and Molly delivered. Shoutout Molly, I won't forget!"
Randall Parisian

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Popular in Linguistics and Speech Pathology

This 3 page Class Notes was uploaded by Molly O'Keefe on Tuesday January 19, 2016. The Class Notes belongs to SPAA 260 at Ball State University taught by Dr. Shaffer in Spring 2016. Since its upload, it has received 47 views. For similar materials see SPAA 260 in Linguistics and Speech Pathology at Ball State University.

Similar to SPAA 260 at BSU

Popular in Linguistics and Speech Pathology


Reviews for SPAA 260, Section 1

Star Star Star Star Star

I'm really struggling in class and this study guide was freaking crucial. Really needed help, and Molly delivered. Shoutout Molly, I won't forget!

-Randall Parisian


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Date Created: 01/19/16
Vibration I 01/13/2016 ▯ Acoustics: The study of sound. It is a branch of physics.  Hearing is our “fastest sense” – we identify our environment through sound. Auditory pathway to the brain is very direct  Sounds in our environment are drivers of emotion  Sounds shape our life experiences  Why do we need to know about acoustics? o We owe it to our clients to know everything about sound, past and present, in their lives. ▯ Bioacoustics: Biology + Acoustics, how animals produce sound, how it is disbursed, and how it is detected  Sensory receptor is activated to detect sound ▯ Kangaroo Rat: They have a range of hearing similar to humans. Small headed animals typically hear higher frequencies  Footdruming is a type of vibration o Substrate-borne vibration: goes through the ground, soil, leaves, etc. different solids. o Footdrumming causes vibration of the soil particles. The vibration transfers from particle to particle in a wave of energy  Vibration: A type of motion. An oscillatory motion- a movement first in one direction and then back again in the opposite direction. o “Vibrations traveling through the atmosphere, water or the substrate represent particle motion in a fluid or elastic body. Particle motion defines the vibration, rather than vibration being defined by the medium through which it is propagated.”  Motion: Displacement over time  Displacement: How far you displace (Amount) and the direction ▯ Newton’s First Law of Motion: “An object at rest stays at rest and an object in motion stays in motion with the same speech and in the same direction unless acted upon by an unbalanced force.”  Friction is what makes objects stop. It is the unbalanced force. ▯ Resonance: When an object vibrates at its natural frequency- It can vibrate really large displacements ▯ When applying force it must be greater than the static friction ▯ Newton’s Second Law of Motion:”The acceleration of an object is dependent on 2 variables – the net force acting upon the object and the mass of the object.” ▯ Frequency: The number of cycles of back and forth vibration in a second. ▯ Vibration starts from a point of equilibrium (or rest position). The motion goes between balanced forces and unbalanced forces. Eventually it will die out because of friction. Kinetic energy is converted into thermal energy. ▯ Treehoppers: Use vibrations on plant stems to communication and make sound ▯ Tymbals are percussion organs found in many insects Cicadas have specialized drumming organs Insects and other species often rub body parts together to product friction  Friction results from intermolecular attraction o “Stick-slip vibrations are self sustained oscillations induced by dry friction”  Static friction & kinetic friction (moving type of friction)  Crickets use a “file” and a “scraper” to produce stick-slip vibration ▯ ▯ Types of Exam Questions ▯ 1) Which of the following statements is true about an object experiencing unbalanced forces?  The object is moving at a constant velocity Not true- it would have to have balanced forces for it to be constant  The object is experiencing acceleration True  The velocity of the object is zero Not true  All of the above ▯ 2) Consider Newton’s first law with respect to the following statements and determine which is true:  An object at rest can only start moving if an unbalanced force is applied True  A force is required to keep a moving object in motion Not true  An object in motion would be accelerating Not true  If an object is at rest, there are no forces acting on it Not true ▯ 3) Which of the following statements is true about an object experiencing balanced forces:  The object is moving at a constant velocity  The object is experiencing acceleration  The object is experiencing a restoring force  None of the above ▯ Restoring Force: on a pendulum, when the swing gets to the top of its arch, gravity is a restoring force ▯ 4) Consider newton’s second law with respect to the following statements and determine which is true:  The direction of motion of an object is in the same direct as the net force True  Acceleration of an object is proportional to the net force. (meaning the greater the net force, the greater acceleration of the object).  An applied force will produce more acceleration in an object with less mass than an object with more mass  All of the object Net Force: The overall force acting on an object ▯ ▯


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