Force1D
Click to run Force1D.
Changes since the last version:
Changes and Features:
- Rename “Object” to
“Choose Object”.
- Added images to
combobox in advanced panel.
- Object choice in 1st
panel with images, with mass readout (no name, here).
- Accel, velocity,
position graphs should be black, not red, green, blue.
- FBD Button needs to
look more like buttons (less like rectangles or titles).
- Move FBD Net Force
graphic up, (not below).
- Rename “Forces” à “Applied Force”
- Delete bottom time
ticks.
- Rename “Net Force” à “Total Force”, and FBD
arrow should be Ftot.
- Fix display of m/s^2
- Vertical chart title
should be renamed from “Force” to “Applied Force (N)”
- Units for all axes.
- Cursor should be
disabled on record.
Fixed Bugs
- Recording motion, then
pausing and rewinding causes an incorrect artifact in the force arrows.
(and actual model).
- Resetting is broken
with respect to
- Clearing readouts on
the graph.
- Resetting the state of
the forces
- Resetting the state of
the leaner.
- Sometimes hard to
duplicate
- Sometimes a heavy
object slowing down will make the force arrows (and forces) flicker
back and forth before coming to rest.
- This can also happen by
increasing gravity on a moving object.
- I fixed this by forcing
the object to come exactly to rest when changing direction (so static
friction kicks in). This seems to fix it.
- Disabling net and
friction force (via checkboxes) should clear the graphs.
- Fixed a bug that caused
the text on arrows (on the object) jump around.
- Turning on Net and
other friction checkbox on the left while Force graph is suppressed has
the wrong behavior.
Known Bugs (in order of
severity):
- Chris says force1d
doesn’t run on a Mac.
- When a PhetGraphic
becomes invisible, it should lose mouse focus and key focus (maybe even
a made-up mouse exited event.)
- Wall force doesn’t
appear during playback.
- Adding barriers during
a recording session has the wrong behavior on playback.