v (m/s)

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# v (m/s) - PowerPoint PPT Presentation

v (m/s). time (s). The object is moving backwards at a constant rate. Then it speeds up, going faster and faster backwards. An object starts from rest from a negative position and moves forward faster and faster. .

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Presentation Transcript

v (m/s)

time (s)

The object is moving backwards at a constant rate. Then it speeds up, going faster and faster backwards.

An object starts from rest from a negative position and moves forward faster and faster.

b) A car is backing up and presses the brake to slow down until it comes to a stop.

v (m/s)

v (m/s)

time (s)

time (s)

v

v

x

x

t

t

t

t

*Stopping*

--------------------------------------------------------------------------------------------------------------------------------------------------------

***

x

x

x

v

v

v

t

t

t

*Turning Around*

***

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***

Velocity vs. Time Graphs
• Above the time axis:

moving forward

• Below the time axis:

moving backwards

v

v

t

t

Velocity vs. Time Graphs
• Going towards the time axis:

slowing down

• Going away from the time axis:

speeding up

x

x

x

x

x

x

Positive acceleration

*Concavity of x-t graphs*

Negative acceleration

Concave up

Concave down