Unit 6

motion

change in position

frame of reference

something that is not moving with respect to an observer that can be used to detect motion

displacement

overall change in position

Vector

a measurement that has both size and direction and may be represented by an arrow

velocity

the speed of the object and its direction

how does an arrow represent velocity

length= speed

the way arrow points= direction

speed

to describe how fast something is going

average speed

distance traveled/ time it takes

constant speed

when an objects speed doesn’t change

when does velocity change

when the speed changes, the direction of motion changes, or both

acceleration

if the speed but not the direction of an object is changing, the object is accelerating

calculating acceleration

final velocity-initial velocity divided by time