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Science
Physics
chapter 1 describing motion (science)
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Terms in this set (43)
reference point
the starting point you choose to describe the location, or position, of an object
position
an object's distance and direction from a reference point
motion
the process of changing positions
displacement
the difference between the initial (first) and the final position of an object
speed
the measure of the distance an object travels per unit of time
average speed
the total distance traveled divided by the total time taken to find that distance
constant speed
the rate of change of position in which the same distance is traveled each second
instantaneous speed
speed at a specific instant in time
velocity
the speed and direction of a moving object
acceleration
a measure of the change in velocity during a period of time
average speed=total distance/ total time
average speed equation
m/s
SI unit for speed
acceleration= final speed - initial speed/ total time
acceleration equation
m/s/s
SI unit for acceleration
positive direction
the reference point is a _____ ______
negative direction
direction opposite the reference point is a _____ _____
to the north
an example of a reference direction
the position of the object has changed
statement that indicates motion has occurred?
distance, direction, reference point
complete description of position includes:
one direction
distance and displacement are equal only if the motion is in ____ ______
an object's position is its distance and direction from a reference point
How does the description of an objects position depend on a reference point?
the distance an object moves is the actual length of its path, its displacement is the difference between its initial and final position
What is the difference between distance and displacement?
straight line
constant speed is shown as ______ ______ on a distance time graph
faster speeds
steeper line on a distance time graph indicate ____ _____
constant speed
straight line on a distance time graph=
speed changes
curved line on a distance time graph=
slowing down
slope decreases and downward curve on a distance time graph=
stopping
horizontal line on a distance time graph =
speeding up
slope increases, upward curve on a distance time graph=
arrow
velocity is represented by an ______
speed
length of an arrow indicates _______
arrow
like velocity, acceleration can also be represented with an _____
increases or decreases
an acceleration arrow's direction depends on whether velocity _____ or ______
opposite
when velocity decreases, acceleration and velocity are in _____ directions
speed up, slow down, change direction
name three ways an object can accelerate
speed time graphs
used to show how speed changes over time
horizontal axis (x-axis)
on a speed time graph, time is shown on the ______ ____
vertical axis (y-axis)
on a speed time graph, speed is shown on the _____ _____
not moving at all
if acceleration of an object is 0 m/s/s , the object is at a constant speed or
acceleration
what is the term for a change in velocity?
accelerating
an object that has the same speed but changes direction is __________
the x-axis is time and the y-axis is distance
What are the axes on a distance-time graph?
the x-axis is time and the y-axis is speed
What are the axes on a speed-time graph?
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