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Software Requirements


Android iOS Windows MacOS
with best with Chrome Chrome Chrome Chrome
support full-screen? Yes. Chrome/Opera No. Firefox/ Samsung Internet Not yet Yes Yes
cannot work on some mobile browser that don't understand JavaScript such as.....
cannot work on Internet Explorer 9 and below



Fu-Kwun Hwang; Fremont Teng; Loo Kang Wee

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Sample Learning Goals


For Teachers

Use this simulation to further investigate the meaning.

Suggested steps:

  1. open in new tab to see the simulation in a new tab with full screen
  2. Uncheck checkbox "x vs t" to hide the position versus time graph
  3. Uncheck checkbox "a vs t" to hide the acceleration versus time graph
  4. Click Play button to run the experiment
  5. Click Reset button to start a different experiment
  6. As you go through the questions below, use the simulation to look for clues and maske sense of the physics concepts



Combo Box and Modes

Toggling with the combo box will adjust the acceleration of the ball respectively.
(Selected Simple Deceleration)
(Selected Uniform Motion = 20)
Choosing the edit v-t graph function however, gives a more complex manipulation of it's velocity.
(Selected edit v-t graph)

Editing the v-t graph

This can be done by dragging the green balls in the graph.
(Dragged Point)
There it also shows the coordinate of the point where you dragged.
You can furthermore make complex graphs like this one:

Display Panel and Check Boxes

Toggling the slow checkbox would toggle the speed of the particle.
Show and Trail checkboxes will toggling the visibility of speed/acceleration and the ball's trail respectively.
The last four check boxes toggle the view of the simulation respectively.

Drag-able Ball

Drag the ball in the world view to toggle it's displacement/position.


(Dragging to the right)

Play/Pause, Step and Reset Buttons

Plays/Pauses, steps and resets the simulation respectively.




SLS simulation (suitable for KAT - conceptual change)  and video explanation (suitable for KAT - scaffolding) added to help students stand a better chance of understanding abstract physics concept of car moving
In the question, we will try to interpret a velocity - time graph.  There are two pieces of content that you need to know: (I will explain how these are derived in the next lesson) The acceleration is given by the gradient of the V-T graph The displacement is given by the area between the line and the x-axis Answer the following question with reference to the following Velocity-Time graph.  The motion of a car is recorded on the velocity-time graph below.
Q1: 00:00 - 02:02 Between t = 0 s and t = 8 s, which section of the motion has a higher acceleration? Answer is t = 5.0 to 8.0 s
Q2 02:03 - 03:02 When does the ball make a U-turn and travel in the opposite direction? Answer is t = 15 s
Q3 03:03 - 03:52 Which section if the car undergoing deceleration? Answer is t = 8.0 to 15 s
Q4 03:53 - 04:00 Which section of the car is undergoing negative acceleration? Answer is t = 8.0 to 18 s
Q5 04:01 - 04:38 By comparing your answer in (c) and (d), describe a difference between deceleration vs negative acceleration. Answer is deceleration is decrease in speed while negative acceleration is negative value of acceleration. 
Q6 04:39 - 5:11 Calculate the acceleration at t = 2.0 s. answer is a = 0.4 m/s^2, the gradient at t =2 happens to be the same as from t = 0 to 5 so it is easy to find.



Other Resources


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