need to have discussion with teacher F2F before i implement the changes

1) Can we have the arrow scale slider permanently displayed, instead of hiding in the green check box?

2) Can we have the two arrows along the same line, instead of one above another?
[color=blue][b]the purpose is to allow visualization when both are perfectly align it is hard to see.
i make it slightly apart still acting of the particle, should be better now.[/b][/color]

3) Can we also hide Mass 1 and display only Mass 2? This will help students observe the individual g and potential graphs before they observe the net g and potential graphs.
[color=blue][b]agree, done [/b][/color]

4) Can we have a button to hide the g field arrows? So that the arrows won't confuse the students when they are observing the potential graphs.
[color=blue][b]agree, done [/b][/color]

5) Is it necc to have the Fnet and Unet? I suggest remove the green and transparent check boxes.
[color=blue][b]to complete the computer model to allow inquiry into the Fnet and Unet.
i recommend keep them for students to understand [/b][/color]

6) Can we indicate 'g' beside the g graph check box? same for potential graph check box.
[color=blue][b]agree, done [/b][/color]

7) Mass 1 and Mass 2 sliders and display boxes are just next to each other and the same blue colour may make it difficult to differentiate. Can you demarcate the two with a thick solid line.
[color=blue][b]agree, done [/b][/color]

8) Can we have a button to display a tangent for potential graph? The gradient of tangent should be equal to the - (g value). Good to display the value of gradient and g value simultaneously for comparison.
[color=blue][b]agree, done [/b][/color]
[color=blue][b]made dV/dr = to show to be compare to g.
for realization of dV/dr = - g.
the minus sign is to be included by students to deepen thinking.[/b][/color]