motion, The change in position of an object with respect to time., in motion, An object's position relative to a reference object changes over time, then the object is..., at rest , No change in position of an object over time, the object is said to be..., reference object, An object used as a standard for comparison to determine whether another object is in motion, distance travelled, total path length that an object travels, displacement, =Final position - initial position, metre (m), S.I. unit for distance and displacement, curvilinear motion, vehicle moving around a roundabout is an example of, rectilinear motion, A train moving on a straight railway is an example of , speed, ...is distance travelled per unit time, only magnitude and no direction, uniform speed, the speed of an object remains unchanged throughout the motion is known as, velocity, the change in an object's position per unit of time during motion, has both magnitude and direction., average speed, calculated by formula: total distance over total time, instantaneous speed , the speed of an object at a specific time (a single moment), average velocity , (final position-initial position)/ time.

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