World class runners can complete 100m dash in
about 10s.
It was found that the runners usually
accelerate uniformly for a certain time and then run at a constant speed for
the remainder of the race.
A world class runner visit your class of 16
students. You are to design a procedure that will allow you to determine the
following:
1. The approximate time the runner accelerates
2. The actual acceleration
3. The constant speed in the remainder of the 100m dash.
You have at your possession the following
items : Stop Watches, meter sticks, chalk and a Starter’s pistol. You can use
the 11 students in the class for the experiment.
1.Outline the procedure you would use and the
various measurements you will take.
1. use tape measure to measure every 10m and
use Tape to mark it
-One student should stand at each section. The
student on the first section should be carrying a pistol while the others a
stop watch. (Where the Tape is marked)
-The student standing at the first mark should
shoot the pistol while the other 15 students start their stopwatches
-The students should stop their stop watches
when the runner passes the section
2. Include a labeled diagram or photo of the
design
3. Outline the calculations and the analyses
you will make to find the 3 required quantities.
By looking at this experiment we can see that this is based on a Time over Distance. The X-axis is the time which will be measured in seconds, and the Y-Axis will be measured in meters. This graph will have a positive slope from the intervals that will be measured by the students.
2. In order to find the acceleration from this experiment we can use this equation. the Vf= Vi+at
3. The constant speed can be discovered by the graph, the slope will give it to you.
3. The constant speed can be discovered by the graph, the slope will give it to you.
