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Chapter 1: Interactions and Motion (8/23)

by: Mary Usufzy

Chapter 1: Interactions and Motion (8/23) PHYSICS 151

Marketplace > California State University Long Beach > Physics > PHYSICS 151 > Chapter 1 Interactions and Motion 8 23
Mary Usufzy
Long Beach State
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About this Document

These are the notes for our first day in class.
Mechanics and Heat
Montserrat Geier
Class Notes
newton's laws, kinematics, vectors, forces




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This 1 page Class Notes was uploaded by Mary Usufzy on Thursday August 11, 2016. The Class Notes belongs to PHYSICS 151 at California State University Long Beach taught by Montserrat Geier in Fall 2016. Since its upload, it has received 4 views. For similar materials see Mechanics and Heat in Physics at California State University Long Beach.

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Date Created: 08/11/16
Chapter 1: Interactions and Motion    ● Kinds of matter (four fundamental interactions in nature)  ○ Gravitational on the cosmic scale   ○ Electromagnetic, strong and weak nuclear force in the scale of atoms  ● Gravitational interactions between objects (weakest)  ● Electromagnetic between electric charges (2nd strongest)  ● Strong nuclear interactions between subatomic particles; HOLDS nucleus together/acts over short distance (strongest)  ● Weak nuclear interactions that arise in certain radioactive decay process (alpha, beta); acts over short distances (3rd strongest)    Scales and Vectors  ● All physical qualities encountered in this text will either be scalar or vector  ● SCALAR ­ completely specificed by only a magnitude (AKA size) (ex. 20 m) (Temperature, speed, mass)  ○ Direction doesn’t matter  ● VECTOR ­ has BOTH magnitude and direction (ex. 10 m + direction, such as South) (Veloctiy, force, displacement)  ● Arrows are used to represent vectors (LENGTH = magnitude & HEAD = direction)  ○ Sometimes, the vector is represented by ​bold lettering ​OR by an arrow on top  ● A ​change of velocity ​(speed or direction or BOTH) indicates the existence of an interaction!  ● Uniform motion = ​NO CHANGE​ in speed/direction (ex. Arrows going up, same size & direction)  ○ Implies ​NO NET interaction B​ UT a special case = the object remains at rest (zero speed)    Newton’s First Law (Law of Inertia)  ● Every body persists in its​ state of rest ​or of moving with ​constant speed​ in a ​constant​ ​direction​, EXCEPT to the extent that  is compelled to change that states by ​forces acting on it ​(Force is the way the AMOUNT of interaction is quantified)  ● If there is ​NO NET interaction ​at all, then the ​DIRECTION and SPEED (aka velocity) ​don’t change.    Describing the 3­D world: vectors  ● Basic properties of vectors: magnitude and direction (3D coordinates ­ Cartesian plane)  ● The position in space can also be considered to be a vector called a ​position vector.  ● Example: A position vector r = <4,3,2> <x, y,z>  ● LENGTH of arrow = distance from origin  ● DIRECTION = direction of vector  ● Magnitude of a vector = square root of the sum of the squares of its components (3D version of Pyt2 ​2 ​2 ​  eorem)  ● The magnitude of a vector is also the absolute value of R, a positive number, and a scalar (R = |x   y​ z​​ r​  


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