PMT MCQs 7.2 - Gravitational Fields - Physics A-level (AQA)

[@isaacrideal5177]

This video is goated with the sauce thank you so much mr shorts. 👍😎

[@pvmslayer7426]

absolute legend saving my exams rn

[@habibtisquad827]

for 8:47 why did you multiply the force with the r? isn’t it supposed to be inversely proportional so you’re supposed to do F1 x 1/r^2 = F2 x 1/r^2

[@ScienceShorts]

They are inversely proportional, so multiplying them gives a constant. Watch my proportionality video.

[@habibtisquad827]

@ thanks!

[@alicechew1924]

Hi science shorts, regarding question 8 why is it GMm/r2 and not GMm/r

[@ScienceShorts]

GMm/r gives potential energy - can't tell what the kinetic energy is from that.

[@lilsels]

For Q19 how do you know which one is r1 and which one is r2?

[@insung27]

The Delta equation is the same as the gradient equation delta y divided by delta x. but in this case, gravitational potential energy(U) = - GMn/r, is a negative sign. so the original equation looks like delta U = -GMn/r (later one) - (-GMn/r)

[@lilsels]

@@insung27 thanks!!!