6
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I’m felt but not seen
Rarely viewed on a screen
If you stand still, I’m nothing
Keep your pace, I’m nothing

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My guess

Acceleration

I’m felt but not seen

You can't see acceleration, but you feel the force on your body

Rarely viewed on a screen

A display will normally show a speedometer, not an accelerometer

If you stand still, I’m nothing

Stand still (stationary) = no acceleration

Keep your pace, I’m nothing

No change of speed = no acceleration

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  • 3
    $\begingroup$ "If you stand still, I’m nothing" is a dubious clue. $\endgroup$ – Gregory Currie Mar 23 at 11:34
  • $\begingroup$ It is actually plain wrong. When a pendulum reaches max height, it stands still but acceleration has reached its maximum as well. $\endgroup$ – infinitezero Mar 23 at 12:14
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    $\begingroup$ I edited the answer. I think the clue is correct-ish. It doesn't say "no speed", but "stand still". "Stand still" can be interpreted as being stationary. And something stationary has no acceleration. It might not pass in a physics exam, but I think it's close enough in a puzzle. $\endgroup$ – CG. Mar 23 at 12:23
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    $\begingroup$ (And I'm not sure I would say a pendulum stands still at its peak. It has a brief moment of zero velocity, but doesn't actually stand still for any measurable amount of time.) $\endgroup$ – CG. Mar 23 at 12:26

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