Physical Science – Chapter 11 "Motion"

motion
the change in position of an object when compared to a frame of reference

frame of reference
usually a stationary object, needed to describe motion

distance
the length of a path between two points

meter
SI unit for distance

vector
a quantity that has both magnitude (amount) and direction

vector
_ in the same direction are added, _ in opposite directions are subtracted

resultant vector
the sum of 2 or more vectors

speed
the ratio of distance an object moves compared to the time elapsed

instantaneous speed
speed at any given moment

average speed
total distance divided by total time (V=d/t)

constant speed
speed that does not vary over time

distance-time graph
the slope of a line on this type of graph is speed

velocity
the speed and the direction an object is moving, a change in this can occur from a change in speed, direction, or both

acceleration
the rate of change in the velocity of an object, a vector

deceleration
negative acceleration

formula for acceleration
a=(Vf – Vi) / t

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