Chapter 9 Flashcards
Motion
When distance from another object is changing
Reference point
A place or object used for comparison to determine if something is in motion
Relative motion
Whether or not an object is in motion depends on the reference point
International system of units
System of measurement scientists use
Speed
The distance an object travels per unit of time
Formula for speed
Speed= distance/time
Formula for Average speed
The total distance divided by total time
Instantaneous speed
The rate at which an object is moving at a given instant in time
Velocity
Speed in a given direction
Slope
Steepness of a line on a graph
Formula for calculating slope
Slope= rise\ run
OR
Y2- Y1/x1-x2
An object is in___ when its distance from another object is changing
Motion
An object is in motion if it changes position relative to a ___.
Reference point
What is the basic unit of length in SI?
Meter
How many centimeters are in a meter?
100
How many meters are in a kilometer?
1000
If given a speed of an object, what do you need to know to determine its velocity?
Direction of motion
Acceleration
The rate at which velocity changes
What does acceleration refer to?
Increasing speed, decreasing speed, and change in direction
What is the formula for acceleration?
Final speed -initial speed over time
What can you use a speed vs. time graph and a distance vs. time graph for?
To analyze the motion of an accelerating object
For a speed vs. time graph, what does it mean if the line is going upward?
That the speed is increasing
What does it mean if the line is straight for a speed vs. time graph?
That the acceleration is constant
For a distance vs. time graph, what does a curved line mean?
That the object is accelerating
