Details Title: Chapter 11 Description: Chapter 11 Total Flash Cards: 42 Created: 02/13/2008 18:04:14		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Physics Flashcards
Cards in this set: Term A frame of refernce is necessary to... Definition to describe motion accurately and completely Term Frame of reference- Definition a system of objects that are not moving with respect to another Term Relative motion- Definition        Relative motion-movement in relation to a frame of reference Term Distance- Definition length of a path between two points      When object moves in straight line, distance is length of line  connecting object’s starting point and ending point Term What is the SI unit for measuring distance? Definition meters(m) Very large distances-kilometers(km) Distances smaller than meter-centimeters(cm) Term Displacement- Definition direction from starting point and length of straight line from starting point to ending point Displacements sometimes used when giving directions. Term Definition Term Vector- Definition quantity that has magnitude and direction Magnitude can be size, length, or amount   Term Vector addition- Definition combining of vector magnitudes and directions. *Add displacements using vector addition   Term Definition Term You add two displacements, represented by vectors when they have ____ direction Definition same Term You subtract two magnitudes, when they are in ____ direction Definition opposite Term When two or more displacement vectors have different directions, they may be combined by Definition graphing Term resultant vector- Definition vector sum of two or more vectors Term speed- Definition a.       ratio of distance that an object moves to amount of time the object moves Term SI units of speed Definition meters per second(m/s)    Need to choose units that make most sense for motion being described   Term average speed- Definition computed for entire duration of trip Term instantaneous speed- Definition -measured at a particular instant -       rate at which object is moving at given moment in time                       Car’s speedometer gives your instantaneous speed         Term average speed formula: Definition   average speed= total distance                         total time   _  v= d      t Term distance-time graph is a good way to describe ____ Definition motion Term Slope of line on distance-time graph is the _____ Definition speed   *Steaper slope on distance-time graph indicates higher speed   Term velocity- Definition speed and direction in which an object is moving a vector  Term two or more velocities add by vector ___ Definition addition Term acceleration- Definition        rate at which velocity changes        Acceleration can be described as changes in speed, changes in direction, or changes in both   a vector Term Definition Term Acceleration applies to any change in object’s _____ Definition velocity decrease OR increase  Term free fall- Definition   movement of an object toward Earth solely because of gravity                     Example of acceleration due to change in speed   Term unit for acceleration: Definition meters per second per second(m/s22) Term free-fall acceleration: Definition 9.8 meters per second squared(9.8 m/s2) --> ~ 10 m/s2 Term You can still accelerate when speed is _____ Definition constant Term Sometimes motion is characterized by changes in both _____ and _____ at the same time Definition speed    direction Term constant acceleration- Definition steady change in velocity Term   Velocity of an object moving in a straight line changes at a _______ when the object is experiencing constant acceleration. Definition constant rate Term You calculate acceleration for a straight-line motion by... Definition diving change in velocity by total time Term Acceleration formula: Definition average acceleration=change in velocity                             total time   _          a=Vf=Vi         t     Term                                                                             If motion is in straight line, velocity can be treated as___ Definition speed Term The slope of speed-time graph is the: Definition acceleration Term Constant acceleration represented on speed-time graph by Definition straight line Term Linear graph- Definition displayed data form straight-line parts Term Accelerated motion is represented by a ___ line on distance-time graph Definition curved Term Nonlinear graph- Definition curve connects  plotted data points Term instantaneous acceleration- Definition how fast a velocity is changing at a specific instant.