Measuring Motion Flashcards
When an object changes position over time relative to a reference point, the object is…
In motion
An object that appears to stay in Place is the
Reference point
A reference direction can be
North, south, east, west, up, or down
What are four examples of a common reference point?
Earths surface, buildings, trees, and other nonmoving objects
What is the formula for speed?
Distance/ time
What is the SI unit for speed?
Meters per second
Is speed constant?
No
What is velocity?
Speed in a particular direction
Constant velocity is always…
Along a straight line
What are examples of things that indicate a change in velocity?
Slowing down, speeding up, and change in direction
What is resultant velocity?
Combining two velocities that are in the same direction
When you combine two opposite velocities…
Subtract the smaller velocity from the larger velocity
What is acceleration
The rate at which velocity changes
Positive acceleration is…
An increase in acceleration
Negative Acceleration is…
A decrease in acceleration
