/r/AskPhysics

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Is my understanding of Newton's 3rd Law correct?

22 upvotes • red_circle57

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What happens when closing speed is > c on a collision? Doea time dilation affect the energy as well? Sorry for my poor wording, I have an example in the text body.

20 upvotes • Malu1997

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Is it too late to pursue Physics?

19 upvotes • weirdtailsme

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How much smaller are quarks (and gluons) than a proton?

18 upvotes • wearsAtrenchcoat

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How can a dimensionless Standard Model give rise to a three-dimensional universe?

18 upvotes • Old_Ad1285

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Why do objects naturally follow geodesics in gravitational fields?

18 upvotes • L31N0PTR1X

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Please explain what Feynman meant by this:

17 upvotes • cutepizza-

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Universe is expanding, but is the space stretching or is space being added?

17 upvotes • CaptainFlint9203

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Is there a formula that allows you to caluclate the half life of a hypothetical nucleus?

17 upvotes • Due_Definition_3763

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Why does observation affect the behavior of quantum particles? How can simply observing a particle change its properties from wave-like to particle-like? It doesn't make sense.

17 upvotes • Designer-Sea2391

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Is my understanding of Newton's 3rd Law correct?	22	red_circle57
What happens when closing speed is > c on a collision? Doea time dilation affect the energy as well? Sorry for my poor wording, I have an example in the text body.	20	Malu1997
Is it too late to pursue Physics?	19	weirdtailsme
How much smaller are quarks (and gluons) than a proton?	18	wearsAtrenchcoat
How can a dimensionless Standard Model give rise to a three-dimensional universe?	18	Old_Ad1285
Why do objects naturally follow geodesics in gravitational fields?	18	L31N0PTR1X
Please explain what Feynman meant by this:	17	cutepizza-
Universe is expanding, but is the space stretching or is space being added?	17	CaptainFlint9203
Is there a formula that allows you to caluclate the half life of a hypothetical nucleus?	17	Due_Definition_3763
Why does observation affect the behavior of quantum particles? How can simply observing a particle change its properties from wave-like to particle-like? It doesn't make sense.	17	Designer-Sea2391