DiracmaA

Free fall, thrown upward vertical acceleration measurement for the horizontal projection

・ It is an application developed at the Mobile Physics Education Research Laboratory (Diracma project) and can be used for dynamic experiments. Please refer to the Diracma project site for details (https://sites.google.com/view/diracma888/).

・ To measure the acceleration of the free fall motion (Y axis of the smartphone), select Free Fall from the menu and drop the machine with the Y axis perpendicular to the ground. To return to normal, select Free Fall from the menu again.

・ To measure the acceleration of the vertical throwing motion (Y-axis direction of the smartphone), select Free Fall from the menu, make the Y axis perpendicular to the ground, and make the positive direction of the Y axis upward, and throw up . To return to normal, select Vertical Up again from the menu.

・ To measure the acceleration of horizontal projection movement (Y axis direction is horizontal direction, Z axis direction is vertical direction), select free fall from the menu, make Y axis parallel to the ground, face up, Project horizontally. To return to normal, select horizontal projection again from the menu.

・ When the app is started, it measures acceleration changes in the smartphone's Y-axis direction (longitudinal direction) and Z-axis direction (vertical direction to the screen), and creates an acceleration-time graph (a-t graph). In addition, restart measurement starts.

-By using the v-t graph button, the a-t graph can be integrated and converted into a speed-time graph (v-t graph).

・ Touch the screen, a marker appears, and the acceleration and speed at that time are displayed (G1 is the value in the Y-axis direction, G2 is the value in the Z-axis direction). You can slide the marker by touch.

-When the TimeReset button is pressed, the time at the marker position becomes 0, and when the marker is moved, the time width can be measured. At that time, the average value of the acceleration and the speed in the time width is displayed (*. * At G1.Av and G2.Av changes to a number).

-Azim, Pitch, and Roll on the screen indicate the rotation angles around the Z axis, Y axis, and X axis, respectively (the values ​​are normal only when the smartphone is stationary). Azim is also azimuth (0 is north).

・ The measurement time can be changed by inputting a numerical value 1 to 5 seconds in the menu Measuring Time (the default value is 2 seconds).

・ Back to a-t graph in the menu is a function to return to a-t graph when it is v-t graph.

・ We will continue to release applications in various physical fields as Diracma series. Thank you very much.