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# Constant Motion

### Linear 1D Motion

Motion An object's change in position over some time interval
Constant Motion An object's position changes by a consistent amount each time interval
Examples of Constant Motion At rest, moving at 30 m/s
Pictorial representation of constant motion . . . . . . . . . . . . . .
Changing Motion (acceleration) An object's position changes by different amounts each time interval
Examples of Changing Motion Speeding up, Slowing down
Pictorial representation of changing motion . . . . . .
Relative Motion Motion depends on the perspective of the observer
Description of constant motion position vs time graph can be a flat straight line or a straight diagonal line
Description of changing motion position vs time graph can be a curved line getting steeper or less steep
Description of constant motion velocity vs time graph must be a flat straight line; slope of 0
Description of changing motion velocity vs time graph can be a diagonal line
What is the significance of the slope of a position time graph? It gives the speed of an object
What is a scalar quantity? magnitude only (number only)
What is a vector quantity? magnitude and direction ( number with a direction)
Examples of scalars speed, distance
Examples of vectors velocity, displacement, acceleration
A steeper slope means what on a position vs time graph? moving faster
A less steep slope on a position vs time graph means? moving slower
The equation for speed is_______. distance/ time
The equation for slope is _______. rise / run
A boy walks 4 m North and then 4 m South. What distance did he travel? 8 m
A boy walks 4 m North and then 4 m South. What is his displacement? 0m
A girl runs 15m from her home in 30 seconds, then realizes she left her project and runs back in 30 seconds. What is her speed? 0.5 m/s
A girl runs 15m from her home in 30 seconds, then realizes she left her project and runs back in 30 seconds. What is her velocity? 0 m/s
What is the equation for velocity? displacement / time
A boat is traveling at 5 m/s north while the river is flowing south at 2 m/s. According to an observer on the shore the boat is traveling at velocity? 3 m/s north
Created by: NISD Physics
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