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From Newton's second law if mass is not constant,

$$F=\frac{dp}{dt}=\frac{d}{dt}(mv)=ma+\frac{dm}{dt}v$$

So Force depends on velocity. And Velocity depends on the frame of reference. So does force depend on the frame of reference?

khaxan
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Ziaul Hasan Hamim
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    Describe a scenario where dm/dv is not zero . – Bob D Oct 06 '23 at 16:18
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    Maybe rockets? I didn't think of scenarios. But here my concern is different. If we assume mass can vary with time, will the force depend on the frame of reference? – Ziaul Hasan Hamim Oct 06 '23 at 16:28
  • I think $\frac{dm}{dt}v$ is thrust force? In that case, $v$ would actually be the relative velocity of the ejected mass. – ekl1pse Oct 08 '23 at 13:55

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