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SI unit for speed/velocity

m/s (meters per second)

SI unit for acceleration

m/s² (meters per second squared)

Positive accelerations

speed is increasing

Negative accelerations

speed is decreasing

Acceleration is zero

the object is not chaning speed (is not moving or is moving with constant speed)

Positive velocity

object moving forward

Negative velocity

object moving backwards

Velocity is zero

object is not moving


speed and direction

Graph: distance vs. time (slope)

slope = velocity

On a distance vs. time graph, constant velocity is represented by

A straight line

(distance vs. time) constant speed forward

straight line, positive slope

(distance vs. time) standing still

straight line, slope = 0 (line is flat)

(distance vs. time) speeding up (accelerating)

smiling curve (slope gets steeper and steeper)

(distance vs. time) slowing down

frowning curve (slope gets flatter and flatter)

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