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Horizontal Line = Stopped!

Look at the red line, which shows the position of an object over time. Is the object moving? No.

 

Steeper lines are faster. The Green line is faster than the pink line.

 

In fact, the speed of the green line is -60/6 or -10 cm/s while the speed of the pink line is roughly 30/10 or 3 cm/s. It doesn’t matter that green is negative.

 

Click here to learn how to calculate average speed.

 

 

 

Object is slowing down

 

Net force is causing an acceleration

 

Object is speeding up

 

Net force is causing an acceleration

 

Constant Speed

 

No Net Force.

Acceleration = Zero

 

Object is slowing down.

 

Net force is causing an acceleration

 

 

[velocity of a line]