# 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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