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RESTING POSITION Refers to an object remaining in the same spot relative to another object.
MOTION Change in an object's position with respect to time and in comparison with the position of other objects used as reference points.
DIRECTION Straight path that an object can move along.
SPEED Rate of change of position (or distance traveled) with respect to time; units measured are expressed as distance per time (ex: meters per second).
LINE GRAPH Graph in which the data are represented by points connected by one or more lines.
DISTANCE-TIME GRAPH Type of graph that illustrates changes in motion; time is graphed on the x-axis and distance is graphed on the y-axis.
X-AXIS Horizontal line with labels on a coordinate grid; time is represented in the x-axis.
Y-AXIS Vertical line with labels on a coordinate grid; distance is represented on the y-axis.
AVERAGE SPEED Calculated by dividing total distance an object travels by total time it took the object to travel the distance (s = d/t); speed describes the rate of movement.
FORCE Push or pull that can change the motion of an object, measured with a spring scale in Newton (N) units.
BALANCED FORCES Separate forces on an object that, when combined, do not change the movement of the object.
UNBALANCED FORCES Forces on an object that cause change in the motion of the object.
POTENTIAL ENERGY Energy that is stored in a system or object.
KINETIC ENERGY Energy of motion.