Good Morning! 04/20/23• Starter: How would you show motion? (What

would the visual look like?)• Keep your starters out I will be coming

around to check them for credit.• Today we will be learning about graphing

motion something you will be doing more of tomorrow.

• Answer: A Graph• But before we get to the graphing, the

answers from the homework

A man is shot out of a cannon at a speed of 25 m/s he is in the air for 3.65 seconds. How far away from the cannon does he land?

After you have showed all of your work the answer should be

91.25 meters.

A high school athlete runs 100 m in 12.20 sec. What is her

speed in m/s?

After you have showed all of your work the answer should be

8.20 meters per second.

A bullet is shot from a rifle at 720 m/s. What time is required for the bullet to strike a target

that is 3240 m?

After you have showed all of your work the answer should be

4.5 seconds

Please turn in your homework, make sure that your full name is in the upper right hand corner.

What does a graph of position and time look like?

• Runners

Now how does speed relate to this?

• Runners

How many of you know what slope is?

• The slope of a line is the rise over the run.

• On a distance time graph the rise is always distance, and the run is always time

So the slope of a Distance vs time graph is…

• This is why we always put time on the bottom of a distance vs time graph.

Slope =Rise

run =

d

t= speed

So what is happening in this graph.

• On your paper please write down what you think is happening in part 1, 2 and 3.

1

2

3

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Part 1

• The person has to be moving at a constant speed, that is relatively slow. 1

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Part 2• This one is

tough, many people want to say that the person is slowing down, but it isn’t, why not?

• It is going back the distance it started from, so it must be going backwards.

2

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Part 3• It isn’t going

anywhere.

– There is no change in the persons distance over time, so it is just sitting there.

3

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The Place between

• The person has to be going faster and then they slow down to a stop.

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Back to the runners

• Runners

The truth is that what we are talking about is more than just

speed.• Speed is just distance over time but what

we are talking about is direction. That is another crucial piece of information.

Velocity

• When you add the information of direction you are no longer talking about speed you now have velocity.

• Velocity is equal to speed + direction!

• How could we very simply show direction?

• Positive and negative

Example

• Why is direction so important?

• Video Clip

• They were going the right speed but not the right velocity.

What do you think represents what?

• Positive velocity means?

• Moving forward, to the right or up

• Negative Velocity means?

• Moving backwards, the left or down

The plot thickens

• Cow on Roller skates