22 terms

Speed and Velocity

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Speed
is a measure of the distance an object travels per unit of time
Unit of speed
are units od distance divided by units of time.
The SI unit for speed
is the meters per second
Constant speed
is the rate of change of position in which the same distance is traveled each second.
Instantaneous speed
is speed at specific instant in time
Average speed
is the total distance traveled divided by the total time it took to go that distance.
The equitation for average speed is
v=d/t, where the symbol v stands for average speed, d stands for total distance, and t stands for total time.
distance-time graphs
Graphs that compare distance and time are called ....
Constant speed is shown as
a straight line on a distance- time graph
Distance-time graphs
can be used to compare the motion of two different objects
motion
Distance-time graphs can be used to compare the ....... of two different objects
Steeper lines
on distance-time graphs indicate faster speeds.
Faster speeds is shown as
a steeper lines on distance-time graphs
The average speed
Distance-time graphs can be used to calculate ........
The average speed of an object
Distance-time graphs can be used to calculate ........... .The difference in distance between two points is divided by the difference in time between same points.
decreasing
When the slope of a line on a distance-time graph decreases, it means that the speed of the objects is ................
An horizontal line
on a distance- time graph indicates that the motion has stopped.
increasing
When the slope of a line on a distance-time graph increases, it means that the speed of the object is...........
Constant
Even when the speed of an object isn't ..........., its average speed can be calculated from a distance-time graph.
Velocity
is the speed and the direction of a moving object.
changes
Velocity...........when the speed of an object changes, when the direction in which the object is moving changed, or when the speed and the direction change.
The velocity of an object
can be represented by an arrow. The length of the arrow indicates the speed. The arrow points in the direction of the object's motion.