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PARABOLA
Parabolic motion is a common motion in physics.
It represents the path followed by an object
thrown up at an angle. This program draws para-
bolas using the dot-graphics capability of the
FP-200.
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When the program is started, it displays coordinates, waiting for input of data. Input
the following data:
g:
Gravitational acceleration (normally 9.8) (m/s
2
)
h:
Height from which object is thrown up (m)
Vo:
Initial velocity (m/s)
0: Angle at which object is thrown (degrees, measured with respect to the
horizontal plane)
If you wish to divide the initial velocity into
x
and y components, input 0 for
Vo.
By
so doing, it is possible to input the initial velocity by Vx and Vy.
When the data is input, the program puts graduations on the x-y coordinate axes and
plots a parabola. Displayed to the right of the parabola are the current values of the
x
and y coordinates, time
(t),
and scale indicating the actual distance (m) represented by
one graduation. When the value of
x
is negative,
-x
is displayed on the graph.
The program temporarily stops when the dot reaches the highest point. Press any key
on the keyboard to continue execution.
When the object falls to the ground (y=O), program execution is terminated, displaying
the final velocity at the bottom right of the screen. Press the keys X, Y, V, and 0, and
the following data are displayed:
X: x-component of final velocity (m/s)
Y: y-component of final velocity (m/s)
V: Final velocity (same as initial velocity) (m/s)
0: Angle as measured from the ground (0 degrees indicates the horizon to the right)
Pressing any other key terminates the program.
The minimum scale value is 1. Hence, specifying an extremely small scale value (values
of
x
and y becpme fractions with two or more digits below the decimal point) may
prevent the program from plotting the parabola. Note also that very large values of
x
and y cause the parabola to become somewhat deformed.
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