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Kinematics
The study of how objects move
Motion
Change in location of an object
Distance
total length of the path travelled
Direction
Line an object moves along
Scalar Quantity
only has magnitude (size)
Vector Quantity
has magnitude(size) and direction
Position
The distance and direction of an object from a reference point
Displacement
Change in position of an object
Avg Speed
total distance travelled/total time taken
Uniform Motion
When a object is moving at constant speed in a straight line
Non-uniform motion
when a object is not at a constant speed and not in a straight line
Slope and Area Memory Aide
PT graph slope = velocity. VT graph slope = acceleration. AT graph area = velocity. VT graph area = Position
Describing motion
Constant velocity - Uniform Motion. At rest or moving. Acceleration. Direction(e)
Avg Velocity
Change in position over a given time interval. Determined by calculating the slope of the secant line on a PT graph.
Instantaneous Velocity
Determined by calculating the slope of the tangent line on a PT graph
Secant Line
A straight line connecting 2 points of a curve or a graph
Tangent Line
A straight line that contacts a curve at a single point and extends in the same direction
Acceleration due to gravity
The acceleration that occurs when an objects is allowed to move freely
Freefall
the acceleration due to gravity of an object in the absence of air resistance. Acceleration = 9.8
