Honors Physics Chapter 2

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Terms in this set (...)

a system for specifying the precise location of objects in space and time
frame of reference
if an object is at rest, its position (does or does not) change with respect to a fixed frame of reference
does not
the change in position of an object
displacement
displacement is a _______ in position
change
displacement formula
displacement (is or is not) always equal to the distance traveled
is not
displacement also includes a description of the _________ of motion
direction
the total displacement divided by the time interval during which the displacement occurred
average velocity
average velocity formula
the average velocity is equal to the ______ _______ needed to cover the given displacement in a given time interval
constant velocity
average speed formula
velocity describes a _______ with both a direction and a numerical value indicating how fast something moves
motion
_______ has no direction, only magnitude
speed
the velocity of an object can be determined if the object's position is known at specific ______ along its path
times
for any position-time graph, average ______ can be determined
velocity
average velocity formula
instantaneous velocity (may or may not) be the same as average velocity
may not
the velocity of an object at some instant or at a specific point in the object's path
instantaneous velocity
the instantaneous velocity at a given time can be determined by ....
measuring the slope of the line that is tangent to that point on the position-versus-time graph
_______ is the rate of change of velocity with respect to time
acceleration
the rate at which velocity changes over time; an object _____(s) if its speed, direction, or both change
acceleration
average acceleration formula
acceleration has dimensions of ...
length
--------
time^2
the slope and shape of a graph describe the object's _____
motion
as an object's velocity increases, the object travels a ______ distance during each time interval
greater
displacement depends on ... (3 things)
acceleration, initial velocity, time
displacement with constant acceleration formula
displacement = 1/2(initial velocity + final velocity)(time interval)
final velocity depends on ...
initial velocity, acceleration, time, displacement
velocity with constant acceleration formula
Vf = Vi + a(t)
final velocity after any displacement formula
Vf^2 = Vi^2 + 2(a)(x)
free falling bodies undergo _______ acceleration
constant
all objects dropped near the surface of a planet fall with the same ____ _____
constant acceleration
the constant acceleration due to gravitational force (motion is referred to as)
free fall
constant acceleration due to gravity (number)
-9.81 m/s^2 (may be rounded to -10)
acceleration is _____ during upward and downward motion
constant
an object thrown into the air has a _______ acceleration as soon as they are released
downward
in a velocity-versus-time graph a straight, diagonal line indicates...
constant acceleration // increasing velocity
free falling objects always have the same _______ acceleration
downward
when an object is thrown up in the air, it has a ______ velocity and a _____ acceleration
positive - negative
at the top of it's path, an object's velocity has decreased until it is ___
0
when an object begins moving down (after its velocity has reached 0) it has a _____ velocity and ______ acceleration
negative - negative
a negative acceleration and a negative velocity indicate that an object is ______ _____
speeding up
in a velocity-versus-time graph a straight, horizontal line indicates...
constant velocity // no acceleration
in a distance-versus-time graph a straight, diagonal line indicates...
constant velocity
in a distance-versus-time graph a straight, horizontal line indicates...
no velocity // not moving
in a distance-versus-time graph a curved (parabola) line indicates...
increasing velocity
position = where an object is ______
located
distance = how far an object ______
travels
displacement = how far from ______ ______ an object is
original position