16 terms

# Science p.16 to 25

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reference point
a place or object used for comparison to determine if something is in motion
International System of units (SI)
A system of measurement based on multiples of 10 and on established measures of mass, length and time.
motion
the state in which one objects distance from another is changing
When is an object in motion?
If it changes position relative to a reference point
meter
Basic SI unit of length. It is a little longer than a yard.
centimeter
one hundreth of a meter.
speed
the distance an object travels in one unit of time (Distance/Time)
constant speed
the speed of an object does not change
How do you calculate average speed
Dvide total distancetraveled by total time. (Total distance/total time)
Velocity
speed in a given direction
How can you show motion of an object?
On a line graph where you plot distance against time.
What is shown on the x axis of the graph?
time
What is shown on the y axis of graph ?
distance
What does a straight line represent on the graph?
motion at a constant speed
What does a horizontal line on the graph represent?
An object that is not moving at all
The faster the motion
The steeper the slope on the graph.