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Physics URGENT help please!

https://www.youtube.com/watch?v=OPg-QvnoGaI&ab_channel=ZPhysics

at 1:54 in the video, he says that he knows one Joule is equal to kg m^2 s^-2. How does he know that?

did he do work done force x distance? But how would you work out the force? Can i say the force is the weight? (so mass x gravity?) ??? But i know that the force isn't necessarily the weight...


Thank you!
(edited 3 years ago)
I just realised that he later explained that he uses the KE formula, but would i be right to use the method suggested above? xx

Thank you in advancee x
Reply 2
Avatar for Shrivats
Shrivats
5
Force= mass * acceleration
Work done= force* displacement
So Joule= kg m^2 s^-2
Reply 3
Avatar for mqb2766
mqb2766
21
Newton 2 gives
F = kg m/s^2
So work done (E) is
E = kg m^2/s^2
As you say. Power is
kg m^2/s^3
(edited 3 years ago)
Original post by mqb2766
Newton 2 gives
F = kg m/s^2
So work done (E) is
E = kg m^2/s^2
As you say. Power is
kg m^2/s^3


Original post by Shrivats
Force= mass * acceleration
Work done= force* displacement
So Joule= kg m^2 s^-2

got it, thank you so much!!

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