s234590
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when do you put =MA at the end? Sounds like a silly question but im just a bit confused! thanks
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Kevin De Bruyne
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(Original post by s234590)
when do you put =MA at the end? Sounds like a silly question but im just a bit confused! thanks
I'm not sure what you mean - where have you seen this before?
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Chicken Fajita
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You find the resultant force by resolving and if the resultant force has an unknown you put F(resultant)=MA and insert the acceleration and mass to find unknown; for example the coefficient of friction. Or you do it the other way round, for example you're trying to find the acceleration you put the resultant force and mass into equation, rearrange and viola.
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s234590
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(Original post by SeanFM)
I'm not sure what you mean - where have you seen this before?
Wasnt very well explained sorry.

You see you have questions where you have to resolve the forces because they are at an angle how comes sometimes when you resolve you =ma
and sometime you just pick a positive direction and make for example the horizontal equal to eachother.

Does that make more sense?
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Kevin De Bruyne
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(Original post by s234590)
Wasnt very well explained sorry.

You see you have questions where you have to resolve the forces because they are at an angle how comes sometimes when you resolve you =ma
and sometime you just pick a positive direction and make for example the horizontal equal to eachother.

Does that make more sense?
Hmm. A specific example or exam question would be helpful to see where you're getting stuck, but when you're resolving forces you find the resultant force on the mass - which is given by MA.
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User1443542
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(Original post by s234590)
Wasnt very well explained sorry.

You see you have questions where you have to resolve the forces because they are at an angle how comes sometimes when you resolve you =ma
and sometime you just pick a positive direction and make for example the horizontal equal to eachother.

Does that make more sense?
If the object is in equilibrium in the direction you're taking, resolve the forces. If it's not in equilibrium in the direction, i.e. you have a resultant force, F=ma, and plug in numbers
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s234590
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(Original post by devangdave)
If the object is in equilibrium in the direction you're taking, resolve the forces. If it's not in equilibrium in the direction, i.e. you have a resultant force, F=ma, and plug in numbers
Thank you this makes sense !!
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