Demonstrations: pick one on the left. Every slider and tick box in Controls acts
live, so you can change the mass or the angle and see the forces and graphs follow.
Freeze a moment: pause, then step 0.1 s at a time, forward or back. The clock
counts in seconds, and each graph is drawn bold up to now, with a dot at the moment you
are looking at. A run stops at its end (a landing, the end of the track); Play starts it
again.
Forces: arrows are drawn to scale within each picture, labelled with their size
in newtons. Labels & forces hides every label, arrow, and gradient so a frame can
be used as a question.
Graphs: the area under a velocity–time graph is shaded as the displacement, and a
dashed tangent on a displacement–time graph shows the velocity as its gradient.
Formulae under Controls work through each demonstration's equations with the
current numbers. Share link copies a link that opens this demo with these
settings, and Export PNG saves the current frame.