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# Motion (chpt 8-9)

### Chapter terms

Acceleration The rate at which an object changes its velocity
Air Resistance A friction-like force that opposes the motion of objects that move through the air
Average Acceleration Average rate at which an object changes its velocity
Average Velocity The rate of change in position for a time interval
Line of Best Fit A straight line that most closely fits the general shape outlined by the graph
Change in Velocity Change that occurs when the speed of an object changes, or its direction of motion changes, or both (Vf- Vi)
Deceleration The acceleration that is opposite to the direction of motion; a decrease in speed of an object
Displacement The straight-line distance and direction from one point to another
Distance (d) A scalar quantity that describes the length of a path between two points or locations
Gravity Attractive forces between two or masses; causes objects to be pulled towards the center of earth
Motion Diagram A diagram that gives a picture of motion by showing an object's position at given times
Position A vector quantity that describes a specific point relative to a reference point
Position-Time Graph A graph of an objects position during corresponding time intervals; (time = x-axis, position = y-axis)
Scalars Quantities that have only a magnitude (no direction)
Slope A direction of a line on a graph, either horizontal (zero), slanting up ( positive), or slanting down (negative) Formula= rise/run
Speed (v) A distance of an object travels given a certain time interval divided by the time interval
Time (t) When an event occurs
Time Interval The difference between the final time and the initial time
Uniform Motion Traveling in equal displacements in equal time intervals
Vectors Quantities that have both a magnitude and a direction
Velocity The displacement of an object during a time interval divided by the time interval
Velocity-Time Graph A graph of an object's velocity during corresponding time intervals (time= x-axis, velocity= y-axis)
Magnitude Refers to the size of a measurement or the amount (number) you are counting
Created by: lindsaym