Mechanics | Revision Server | Page 1

burnt sand May 4, 2023, 11:49 AM

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can someone help me with this please? i’m so lost,,

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ignore the writing my bad,,

reef marsh May 4, 2023, 12:12 PM

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you have the acceleration so you want to use f=ma

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first get the tension by using f=ma on particle B

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then use f=ma on the box

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the resultant on A will be the tension - weigh sin theta - friction

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make the friction subject

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friction = tension - weight sin theta - 0.2a

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then divide this by weight cos theta to get the coefficient

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since friction is reaction x coeff. of friction

somber granite May 4, 2023, 12:30 PM

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burnt sand May 4, 2023, 9:16 PM

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reef marsh since friction is reaction x coeff. of friction

not quite sure where i’m going wrong,,

reef marsh May 4, 2023, 9:24 PM

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You got the tension wrong

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You didn't multiply the g

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reef marsh May 4, 2023, 9:31 PM

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reef marsh You didn't multiply the g

Or maybe you did I dont quite understand what happened there

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Oh your equation for A is wrong

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You're solving as if it is in equilibrium

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It's not

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It has the same acceleration as B

burnt sand May 4, 2023, 9:36 PM

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ah yes yes yes yes yes

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i got it

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thank you!

#Mechanics