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science Chapter 1 Motion test
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Gravity
Terms in this set (41)
how do you know if an object is in motion?
if its position chnages relative to another object
reference point
A place or object used for comparison to determine if an object is in motion
what happens if your reference point is in motion?
you might think that you are in motion not the reference point
what happens if you use the sun as your reference point
you would be in a very fast motion because the earth revolves around the sun
what is the speed at which the earth revolves around the sun
30 kilometers every second
how do you describe motion completely
by using its units
the length of the path between two points
distance
the SI unit for length
meters
speed
the distance an object travels per unit of time. it is a type of rate
what is the formula for speed(written as an equation)
distance divided by time
the SI unit for speed
m/s
the speed of most moving object is
not constant
average speed
the overall rate of speed at which an object moves
how do you calculate and objects speed
total distance divided by total time
instantaneous speed
the speed of an object at one instant of time
what do you know if you no both the speed and direction of an object's motion
its velocity
velocity
speed in a given direction
what is one example of when velocity is important
when flying airplanes
how can you show the motion of an object on a line graph
plot the distance versus time
which axis is time shown on
the horizontal or x axis
which axis is distance shown on
the vertical or y axis
one pointauto line represents
the distance an object has traveled during a particular amount of time
the slope of a distance versus time graph represents..
speed
slope
the steepness of a line on a graph
what does slope tell you
how fast one variable changes in relation to the other variable (the rate of change)
you can calculate slope by
dividing the rise over run
what does acceleration mean in everyday language
the process of speeding up
acceleration
the rate at which velocity changes
in science acceleration refers to
increasing speed, decreasing speed, or chaining direction
what happens when an object changes speed
the object accelerates
negative acceleration is the same thing as what
deceleration
when an object is accelerating at a constant speed but changing direction the simplest example of this type of motion is...
circular motion, or motion along a circular path
what does acceleration describe
the rate at which velocity changes
if the object is not changing direction, how do you describe its velocity
the rate at which its speed changes
what is the equation for acceleration
final speed-initial speed divided by time
how is acceleration measured
meters per second per second or m/s squared
how can you analyze the motion of an accelerating object
using a distance versus time graph and speed verses time graph
a slanted strait line of a speed versus time graph means what
the object is accelerating at a constant rate
your accelerating is the
slope of the line
a curved line on a distance versus time graph tells you what...
during each second you traveled a greater distance Than he second before and your speed is also better than the second before
what is the slope of a distance verses time graph
the speed of an object
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