## Physics Ch 3&4

##### Created by:

idojisama  on December 6, 2011

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# Physics Ch 3&4

 position-time grapha graph that shows how position depend on time
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#### Definitions

position-time graph a graph that shows how position depend on time
rise the vertical separation of any two points on a curve
time interval the difference between two clock readings
reference point the positions of objects can be compared to a chosen position
clock reading a measurement of time
instaneous velocity on a position-time graph, the slope of a tangent to the curve is the ________ at that instant
displacement the change in position of an object
frame of reference a way of viewing positions, based on the reference point that is chosen
run the horizontal separation of any two points on a curve
position the separation between an object and a reference point
distance the separation between two objects
factor-label method the method of converting units using dimensional analysis
constant velocity an object that has the same average velocity for all time intervals is moving at ______
scalar a quantity that has only magnitude
speed the magnitude of velocity
slope the ratio of rise to run is the ____ of a curve of a graph
instantaneous position the position of an object at one and only one time
vector a quantity that has both magnitude and direction
average velocity the change of position divided by the time interval over which the change occurred
velocity expression of both the speed and direction of motion
velocity time graph a graph that shows how velocity depends on time
initial velocity the velocity when the clock reading is zero
instantaneous acceleration on a velocity-time graph, the slope of a tangent to the curve is the ____ at that point
final velocity the velocity after acceleration has occurred
constant acceleration acceleration that does not change in time
acceleration due to gravity the constant acceleration that acts on falling bodies

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