Click to run Force1D.

Changes and Features:

• Rename “Object” to “Choose Object”.
• Added images to combobox in advanced panel.
• Object choice in 1^st 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.