1. Remaining Force1D Bugs & Problems:

• Have to hit ‘go’ after manipulating a slider.
• ???
• Nobody notices the tabs.
• ???  This is a problem for many simulations, non?
• When graphs cleared, a residual .3m/s^2 remains.
• This must be fixed.
• I’m having trouble reproducing this error.  Maybe I fixed it earlier?
• On FBD, if the mouse is over an arrow, the FBD doesn’t get a release event.
• Superimposed nature of the forces is confusing.
• Student suggests clicking one brings it “to the top”
• We could also draw these with dotted lines (different phase), so one is not always dominated.
• Nobody types values for Force1d.
• Blinking cursor?
• Big forces run out of the FBD window.
• Choose a different scale by default? (I think rescaling may be awkward for students)
• Or we could just factor out scale altogether (a normalized FBD).
• Wiggle Me:  Click to set force in FBD, confusing.
• I remember even PhET team members were surprised that you can click in the FBD.
• I fixed a bug that made clicking on the wiggle me ineffective.  I don’t think this solved the underlying problem.
• Windowed FBD seems to be a nuisance.
• ???
• Chris says this doesn’t run on a Mac.
• Ron’s forthcoming change to phetcommon UI is a possible fix candidate.  Let’s wait until we see this.)
• Wall force doesn’t appear during playback.
• Let’s let this go until we student feedback says otherwise.
• Adding barriers during recording have the wrong behavior on playback.
• Let’s let this go until we student feedback says otherwise.

 

 

2. Force1D Bugs & Problems Fixed (since the last version.)

• Reset doesn’t stop the clock.
• Easy to fix.
• Fridge never moves at default friction.
• Let’s leave this.
• Changing objects with friction off should leave friction off.
• Easy to fix.
• I changed this in the model. (not by changing an object’s friction coeff, but by ignoring the friction computation altogether.)
• Recording mass change without object change has weird effects on playback (same object changes size, then.)
• I can record change of object, if we want.
• I’m recording change of object.  Since mass is smoothed, and object index is not, there is a smooth resizing from one object to another (I think it looks neat, but it could be deceiving.)
• Or we could disable changing object during record mode. (awkward for user)
• Small distance scale is frustrating.
• Default: should be barriers on.
• Did this, should
• Should we do something else here?
• FBD should have subscripts, not N and mg.
• Easy to fix.
• Checkboxes for Total and Frictional Force suggest activation of force (not display).
• Just rename them “Show Force?”
• Reset advanced controls: restore defaults button on advanced panel.
• I can add a restore defaults button.  This restores gravity and values for the current object (other objects are restored when you reselect them.)
• Gravity Values: should be compared to other planets, etc…
• I can put in other planet values.
• Added tick marks and labels for Moon, Earth, Jupiter.
• Removed other tickmarks and labels.
• Nobody clicks help, but students looked for a help menu.
• I can add a help menu, should we do this for other simulations?
• I added a help item in the help menu that shows the wiggle me for that module, and left a placeholder for megahelps (applications without megahelp show a dialog that says no megahelp is available.)
• Add a noise (or *bam*) when something hits the barrier.
• I can add this.
• Crash sound depends on momentum.