PHYS 1010 Week 2 Notes
PHYS 1010 Week 2 Notes PHYS 1010-01
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This 2 page Class Notes was uploaded by HaleyG on Friday January 22, 2016. The Class Notes belongs to PHYS 1010-01 at Tulane University taught by Timothy Schuler in Fall 2016. Since its upload, it has received 47 views. For similar materials see Great Ideas in Science & Tech in Physics 2 at Tulane University.
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Date Created: 01/22/16
PHYS 1010 Notes Week 2 Jan 2022 Vectors and Coordinate Systems Motion Mechanics: the general term for the branch of physics which deals with the motion of objects, and the forces that cause motion Kinematics: basic principles of how an object moves without taking forces into consideration Motion: the change of an object's position within some time Galileo Developed foundation for describing physical motion Relationships between four physical properties: time, position, velocity, and acceleration Position and time Measure position by placing an arbitrary coordinate system (reference point) around the object and describing the position as an (x, y) coordinate Coordinate systems are created, not natural Time also behaves as a coordinate system and can be defined arbitrarily as well Vector: an arrow that describes a property within a given coordinate system and describes two pieces of information: magnitude (how much?) and direction (where?) Straight lines that describe properties at their origin Length: distance Direction: location Provides information about changes in position (displacement) Displacement is independent of any coordinate system Adding/subtracting vectors requires that we use specific rules to maintain the magnitude/direction of the resultant vector Add vectors "tip to tail" and new vector is drawn from the beginning of the first vector to the end of the other Properties of vectors Two vectors are equal if they have the same magnitude and direction, regardless of the starting point of the vector Scalar: numbers/units that describe a magnitude of physical quantity Vectors describe both magnitude and direction Breaking vectors into their components simplifies adding a bunch of vectors together to get the resultant vectors Change to A does not affect A and vice versa x y Velocity Time interval measures the amount of time taking place between two events (Final Time Initial time = Change in time) Time is not a vector (does not have direction) Velocity: how fast an object is moving (speed and direction) Velocity = (displacement vector) / (change in time) Average velocity vector will point in same direction as displacement vector Acceleration: change in velocity with time Can occur with either a change in magnitude or direction of velocity vector Acceleration = (change in velocity) / (change in time) Instantaneous velocity Equations for velocity and acceleration work if we are measuring uniform motion: motion that does not change over time Instantaneous motion: immediate motion at some precise moment in time Average velocity = (total displacement) / (change in time) Instantaneous measurements are determined with calculus: limits, derivatives, and integrals Area under velocity curve = position Gravity Every object is being accelerated by gravity at the same constant rate If we throw an object, gravity acts on that object and it decelerates until it reaches zero velocity, and then the gravitational acceleration will make the ball move back in a downward direction to it's original position Projectile motion: moving up or down AND left or right Vertical acceleration does not affect horizontal velocity
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