Moments help | Mathematics | Page 1

stable cape Apr 13, 2025, 9:07 PM

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Can someone help? I need to get 6.55N but I really dont understand how to get there

hallow tokenBOT Apr 13, 2025, 9:07 PM

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stable cape Can someone help? I need to get 6.55N but I really dont understand how to get th...

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quaint hamlet Apr 13, 2025, 9:09 PM

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stable cape Can someone help? I need to get 6.55N but I really dont understand how to get th...

What does it mean "the magnitude of the force at B"? Like, is B accelerating? If not, net force should be 0, right?

stable cape Apr 13, 2025, 9:11 PM

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heres the markscheme

meager vine Apr 13, 2025, 9:32 PM

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quaint hamlet What does it mean "the magnitude of the force at B"? Like, is B accelerating? If...

I believe it's referring to the normal force

stable cape Apr 13, 2025, 9:34 PM

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meager vine I believe it's referring to the normal force

yeah it is

timid spade Apr 13, 2025, 9:41 PM

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stable cape Can someone help? I need to get 6.55N but I really dont understand how to get th...

what do you need help with?

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you choose a pivot and work out the moments for equilibrium

stable cape Apr 13, 2025, 9:43 PM

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i just dont know where they got 70° from and how theyve used that to get to the final answer

timid spade Apr 13, 2025, 9:47 PM

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stable cape i just dont know where they got 70° from and how theyve used that to get to the ...

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so do you know how the normal force acts normal to the surface?

stable cape Apr 13, 2025, 9:47 PM

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yeah it acts perpendicular to it i think

timid spade Apr 13, 2025, 9:48 PM

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yes

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and did you work out the moment at B?

stable cape Apr 13, 2025, 9:48 PM

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no

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ohh wait i get it i think

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i got RSin70 and RCos70

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so do i just resolve the moments from A?

timid spade Apr 13, 2025, 9:51 PM

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uh yeah

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but

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they dont both produce moments

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right?

stable cape Apr 13, 2025, 9:52 PM

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wait why

timid spade Apr 13, 2025, 9:52 PM

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do you know the definition of a moment

stable cape Apr 13, 2025, 9:52 PM

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like the turning effect at a point

timid spade Apr 13, 2025, 9:53 PM

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force * distance (perpendicular based on force) to the pivot

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or

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(perpendicular component of force) * distance

stable cape Apr 13, 2025, 9:55 PM

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so we ignore Rcos70 because its not perpendicular?

timid spade Apr 13, 2025, 9:56 PM

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yes

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can you see how Rcos70 is completely parallel to the rod

stable cape Apr 13, 2025, 9:56 PM

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yeah

timid spade Apr 13, 2025, 9:56 PM

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imagine it in real life

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do you think applying a force that way would produce a rotation

stable cape Apr 13, 2025, 9:57 PM

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no

timid spade Apr 13, 2025, 9:57 PM

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yeah

stable cape Apr 13, 2025, 9:58 PM

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oh wait that actually makes a lot of sense thank u sm

timid spade Apr 13, 2025, 9:58 PM

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np

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you can solve it now right?

stable cape Apr 13, 2025, 9:58 PM

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yeah i managed to get it

timid spade Apr 13, 2025, 9:58 PM

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good

vapid pantherBOT Apr 14, 2025, 10:00 PM

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@stable cape

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#Moments help