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I. The Graph of the Week - Due Friday, 8am.
III. Velocity Calculations
Wow. Blazing fast. But there's a lot we can do with the information we know about how fast Usain Bolt ran the 100m dash.
1. What was his velocity (speed)? Well, velocity is the relation of distance to time, which we know from mph (miles PER hour). So, in scientific terms, v=d/t.
***A note about calculations. You do not have to memorize formulas. You will always be given them. However, you must write the formula down EVERY TIME you perform a calculation.
So, what was Usain Bolt's velocity?
Formula (2 points)
Work with units (2 points)
Answer with units (1 point)
This is how ALL calculations are graded.
2. If we know how fast someone is running, and we know how long they ran, we can determine exactly how far they ran. Let's use Usain Bolt as our example. If he ran at the same velocity as he did in Problem #1, and did it for 5.5 seconds, how far did he run?
You could use some algebra to rearrange the formula above. Or you could just plug the number in and solve for the distance. If you are a person that gets a bit scared by algebra, I will always give you the equations. In this case, d=v*t.
How far did Usain Bolt run?
3. Finally, if we know the velocity and we know how far he HAS to run, we can figure out how long it will take him to get there. How long did it take Usain Bolt to run 75m?
The formula, always provided to you, is t=d/v.
Practice work: Velocity Calculations Practice - found in Classroom. To be done on your own paper.
IV. Using Capcut to analyze time.
Human error occurs in all hand-timed events. There is about a 1/4 second difference between when you see something happen and when your brain/nerves can tell your finger to push the start/stop button. And that happens both when you start AND stop the watch.
However, we have some easy to use technology at our fingertips that takes much of the error out. CapCut allows us to analyze video at 30 frames per second. In other words, we can see, down to 1/30th of a second, when an event happened. And all we have to do is take video and upload it to CapCut.
So, let's try.
One partner get a camera to attach to your Chromebook (phone videos are HUGE and take a long time to upload at school). You will use the Camera app to record the video.
Record something moving. Mr. Hollis will decide what it is.
Add the video to CapCut. Both partners will do this on their own devices.
Determine the distance and time that the object traveled. To determine time, screen capture when the object crossed the 'start' line and then screen capture when it crossed the 'finish' line. Determine the difference to find the time. Calculate the velocity.
Add your two screen captures and your calculations to a Doc. Turn that in.
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