APhO 2023 – Experimental Problem 1 – Hertzian contact of colliding pendulums
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E1 build 2026-08-14 14:04 UTC
Bench and oscilloscope
Cabling
M Pos = ----
wheel acts on: – (click a dial first)
Balls on the hangers
pendulum 1
big d = 31.75 mm
small d = 25.42 mm
pendulum 2
big d = 31.75 mm
small d = 25.42 mm
pendulum 2 in use (off = Part A / B)
Ball positions
hanger separation dx-2R (mm)
wire length difference dz (mm)
photogate position (mm)
pull the ball aside phi0
the angle is not printed anywhere: read it off the protractor, as on the bench
Electromagnet holder
COIL lever: DOWN – click to grip the ball
■ stop the pendulum
Notes
Every oscilloscope setting is on the instrument itself: click a dial to select it, then turn the mouse wheel over the panel. Pushing a knob does what the manual says – HORIZONTAL POSITION zeroes the delay, SEC/DIV toggles Zoom, VERTICAL POSITION zeroes the offset, VOLTS/DIV toggles coarse and fine, TRIGGER LEVEL jumps to 50 %. Roll runs at 50 ms/div and slower; Single takes one shot.