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The equation :F=ma won't apply to this situation. Both mass M and mass m are at free fall , they will have the acceleration A and a according to pulley ratio since they start from speed zero meters per second and the speed ratio is always the same according to pulleys' ratios.I think of the same system as follows :The mass M has acceleration say 4 m/s.s after three intervals of time 1, 2,3 seconds its speed becomes 4 , 8, 12 m/s respectively think of any other system connected in such way , let say pulley ratio is 1:4then when pulley #1 has speed 4m/s then P2 will have 16 m/s according to pulley ratio , when P1 has 8 m/s P2 has 32 m/s , P1 has 12 m/s , P2 has 12*4=48 m/s , let's calculate acceleration on P2:time intervals are 1,2,3 speeds are 16,32,48 respectively , a=16 m/s.s which is =A*4 At that case the equation F=ma won't satisfy for mass m, i.e force on mass m won't equal to its mass multiplied by acceleration:Let's have mass M is 4 times mass m. M=4m, let the ratio this time be 1:6force on mass M is its weight minus gm/6=gM-gm/6 A=F/M=(gM-gm/6)/M=(gM-gM/24)/M= (1-1/24)gforce on mass m is 6gM-gma=F/m=(24gm-gm)/m=23gA is not equal to 6 times a as it should be above.“The reason is because the third law won't apply as well , objects do not exert the same force however a force according to the pulley ratio , another law should be presented for such situations where the action and reaction are not equal, objects M and m do not touch directly so that there is equal action and reaction"so will the second law apply? why not?

Both mass M and mass m are at free fall

will the second law apply?

They have things tied to them.

Quote from: Bored chemist on 21/07/2018 00:42:46They have things tied to them.Tied can be such a loose term....

Quote from: Thebox on 21/07/2018 00:51:35Quote from: Bored chemist on 21/07/2018 00:42:46They have things tied to them.Tied can be such a loose term....Shut up, you useless idiot.

Yup that is me, useless idiot, what gives you the right to tell me to shut up?

Quote from: Thebox on 21/07/2018 00:55:45Yup that is me, useless idiot, what gives you the right to tell me to shut up? Since you accept that your "contributions" are useless, you should stop wasting others' time + bandwidth.There's nothing special about me telling you that- you should already know it. I'm just reminding you because I happen to be here.

Cluttering up people's threads isn't conversation, it's vandalism.

You started the vandalism....not me, well maybe it was me when I got to the feeling sorry for myself.

Quote from: Thebox on 21/07/2018 01:10:40You started the vandalism....not me, well maybe it was me when I got to the feeling sorry for myself. NopeThis "Tied , can be such a loose term to use. Subjective is subjective...." wasn't meaningful- it just cluttered the forum.

Quote from: Yahya on 20/07/2018 23:00:58Both mass M and mass m are at free fall No.They are not in free fall.They have things tied to them.It would be sensible for you to learn physics before trying to claim that physics is wrong.

I know what free fall is I meant it in a deeper sense,

I said the law does not apply to this situation

Quote from: Yahya on 21/07/2018 03:39:16 I said the law does not apply to this situation Spoiler alert; it does.