Physics 9/22 | Physics

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Physics 9/22

10th - 11th grade

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mr_sparks

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Slide 1
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Welcome back to class everyone!
So there's some stuff I need to go over to make last week's assignment make more sense.
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Question 2
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Before we start, how are you feeling today?
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Slide 3
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Last time we did some graphing!
Well, you should have. Based on that tumble buggy video you should have created a graph using google sheets...
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Question 4
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What kind of graph did we make it last time??
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Position vs Time Graph
Speed vs Time Graph
Velocity vs Time Graph
Time vs Time Graph
Position vs Time Graph
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Speed vs Time Graph
Velocity vs Time Graph
Time vs Time Graph
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Slide 5
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Let's talk about graphs!
specifically PvT graphs
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Slide 6
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Position
Position describes the location of an object in space relative to some reference point or system. (GPS coordinates for example)

In the lab we tracked the changes in the buggy's position over time.

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Slide 7
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PvT Graph
When you plot the changes in position over time.

You get what we refer to as a Position vs Time graph.
Or PvT graph.
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Slide 8
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Velocity
When you calculate the slope (rise/run) of a PvT graph you get velocity!

Velocity is the speed and direction of an object.
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Question 9
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If the slope of a PvT graph equals Velocity. Then what do you suppose the formula for Velocity is??

(hint = think of the formula to calculate slope and how it relates to a PvT graph.)
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Slide 10
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Displacement
Displacement is the change in an object's position.

So we can also refer to a Position vs Time graph as a Displacement vs Time graph!
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Slide 11
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For instance:
In the PvT graph to the right you can see the changes in the object's position.

You will find the object's displacement by taking the difference between any 2 positions.
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Question 12
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Given what you know about displacement now. Which of the following do you think is the Velocity equation?
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$v\ =pt$
$v=\frac{d}{t}$
$v=dt$
$v=\frac{t}{d}$
 <math><semantics><mrow><mi>v</mi><mtext> </mtext><mo>=</mo><mi>p</mi><mi>t</mi></mrow><annotation encoding="application/x-tex">v\ =pt</annotation></semantics></math>v =pt 
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 <math><semantics><mrow><mi>v</mi><mo>=</mo><mfrac><mi>d</mi><mi>t</mi></mfrac></mrow><annotation encoding="application/x-tex">v=\frac{d}{t}</annotation></semantics></math>v=td 
 <math><semantics><mrow><mi>v</mi><mo>=</mo><mi>d</mi><mi>t</mi></mrow><annotation encoding="application/x-tex">v=dt</annotation></semantics></math>v=dt 
 <math><semantics><mrow><mi>v</mi><mo>=</mo><mfrac><mi>t</mi><mi>d</mi></mfrac></mrow><annotation encoding="application/x-tex">v=\frac{t}{d}</annotation></semantics></math>v=dt 
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Slide 13
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Additional things to know about PvT graphs
You can determine if the object is moving in a positive direction or negative direction based on the slope direction. Up is positive, down is negative.

A flat line on a PvT graph means that the object is not moving. Velocity is 0!
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Question 14
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Which of the following graphs shows an object at rest (or not moving)?
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Question 15
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Which of the following graphs an object moving with constant positive velocity?
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Question 16
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Which of the following graphs shows an object moving with constant negative velocity?
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Question 17
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What do you suppose is happening to the velocity in this graph? Can you think of a term that would describe it?
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Question 18
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According to the graph. Which line represents the fastest object?
answer
A
Red
A
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Red
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Question 19
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According to the graph, which line represents the slowest object?
answer
C
green
C
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green
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