

Now you're ready to
figure out how high your rocket flew.
Collect measurements for your rocket’s flight from three different
people. Each person probably got a slightly different measurement.
To improve the accuracy of measurement, sometimes scientists take many
measurements and then average the results. To get an average, add up the
three measurements for your rocket and divide by 3.
Measurement 1:
________ degrees
Measurement 2: ________ degrees
Measurement 3: ________ degrees
______________________________________
Total:
________ degrees/3 = ____average angle in degrees
Take a look at the Rocket
Height Calculator Grid.
Each
division on the grid represents 100 cm in the real world. Imagine that
your eye is right by the protractor in the lower lefthand corner of the
grid. The line at the bottom of the grid is a line parallel to the ground,
right at the level of your eyes.
On the protractor in the corner of the grid, find the average angle that
you calculated in Step 2. Mark this angle on the protractor.
Place your ruler so you can draw a line through the mark on the protractor
and through the corner of the grid. Extend this line all the way across
the paper.
The people measuring how high the rocket flew stood 10 meters (1,000 cm)
away from where the rocket was launched. That’s why the rocket launch
site marked on the grid is ten squares away from the protractor. Starting
at the rocket launch site, draw a straight line that’s perpendicular
to the eyelevel line. Draw this line all the way up to the top of the
grid.
Now you have a triangle. At one corner of the triangle is your eye; at
another corner is the rocket launch site; at the third corner is the rocket
in flight.
The height of the triangle tells you how
high your rocket flew above eye level.
The height above eye level is _____ cm.
The eye level of the average American twelveyearold is about 140 cm.
So add 140 cm to the number you got in Step 7 to get the height of the
rocket’s flight.
The height of the
rocket’s flight is ______ cm.
For tips on
how to use this trick with a class or group, go to the Teacher/Leader
version 