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# Phys 02 Motion

### Linear Motion (Speed, Acceleration, Motion Graphs) Terms

physics term for your 'surroundings' frame of reference
reference point (0,0) in a coordinate system origin
meaning of "at rest" motionless
location within the frame of reference position
change in position with respect to surroundings (frame of reference) motion
when your motion can be different depending on what it is compared to, that is _?_ motion relative
when riding on an elevator, you are motionless compared to _?_ the inside of the elevator
when riding on an elevator, you are moving relative to _?_ the floors in the building, etc.
when treating an object as a single point in motion, you are using the _?_ model particle
describe the motion: .............. slower steady speed
describe the motion: . . . . . . . . faster steady speed
describe the motion: . . . . . . . very fast steady motion
describe the motion: .. . . . . . . . accelerating
separation between positions distance
distance in a particular direction displacement
abbreviation for distance/displacement ∆x
quantity having only magnitude (size) scalar
quantity having BOTH magnitude (size) and direction vector
total distance ÷ total time average speed
rate of change of distance (or "how fast") speed
quantity measured with a speedometer instantaneous speed
device in car that measures total distance traveled odometer
rate of change of displacement (speed in a particular direction) velocity
examples include +25 m/s, or 15 m/s East velocity
SI unit of distance or displacement m
SI unit of speed or velocity m/s
direction assigned to negative (–) horizontal displacement or velocity west
direction assigned to positive (+) horizontal displacement or velocity east
symbol for speed or velocity v
SI unit for time s
rate of change of speed/velocity acceleration
SI unit of acceleration m/s^2 (m/s/s)
another term for negative (–) acceleration... but don't use it in physics! deceleration
abbreviation for acceleration a
abbreviation for acceleration due to gravity g
gravitational acceleration near Earth's surface (3 significant digits) 9.80 m/s^2
graph shape that indicates y is independent of x horizontal line
graph shape that indicates y is directly proportional to x linear (diagonal) line
graph shape that indicates y is inversely proportional to x hyperbolic
graph shape that indicates y is proportional to the square of x parabolic
x-t graph for object at rest horizontal line (may be on or above the x-axis)
v-t graph for object at rest horizontal line on the x-axis (0)
a-t graph for object at rest horizontal line on the x-axis (0)
x-t graph for object at constant speed/velocity linear (diagonal) line
v-t graph for object at constant speed/velocity horizontal line (above x-axis)
a-t graph for object at constant speed/velocity horizontal line on the x-axis (0)
x-t graph for object undergoing constant acceleration parabola
v-t graph for object undergoing constant acceleration linear (diagonal) line
a-t graph for object undergoing constant acceleration horizontal line (above x-axis if +, below x-axis if –)
synonym for "constant" or "unchanging" used to describe motion uniform
slope of an x-t graph: unit and quantity given m/s; speed
slope of a v-t graph: unit and quantity given m/s^2; acceleration
slope of an a-t graph: unit and quantity given m/s^3; the 'jerk'
area underneath an x-t graph: unit and quantity given m•s; ---
area underneath a v-t graph: unit and quantity given m; distance
area underneath an a-t graph: unit and quantity given m/s; (change in) speed
if graph lines A & B on an x-t graph cross at point P, what does that represent? A & B are at the same place (ex: A passes B at point P)
if graph lines A & B on a v-t graph cross at point P, what does that represent? A & B are moving at the same speed at P (not passing!!!)
if the motion of A and B are on the same x-t graph, how do you know which is going faster? the faster one has a steeper graph
if the motion of A and B are on the same a-t graph, how do you know which has the greatest change in speed? the one with greater change will have a larger area between its graph
Created by: goakley