4.2c Ex1 MJ21 P12 Q13 Angle of Hanging Square Sign | May/June 2021 | Cambridge A Level Physics

Example 1 - 9702/12/M/J/21: A uniform square sign of weight 40 N is suspended vertically from its top edge by a horizontal hinge, as shown. The hinge is not frictionless. When the sign is displaced from the vertical by an external force and then released, it does not return to the vertical position. The maximum torque exerted by the hinge on the sign is 6.0 N m. The sign is displaced by 90 so that it is horizontal and then gradually released. At which angle to the vertical does the sign hang after release?
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Recorded at MCKL #CambridgeALevelPhysics

[@drshehryarmohsin.2003]

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[@rayyanvlogs8573]

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[@c1pher266]

was a tricky question but you solved it so easily damn....

[@iffatejaz8789]

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[@mohammadumerfarooq6199]

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[@ayeshahah8237]

Maam Thank you for explaining. I need to ask how did you get the distance 0.4

[@toxicwaste1776]

This is because its the distance that it takes to reach the center of equilibrium, considering its a uniform platform this means that the center of gravity is at the center of the object. The formula for the moment is force x perpendicular distance, when it comes to the weight. Its the weight x the distance to the center of gravity, so she just got the half of the length of the platform (which is 0.8) to get the distance it takes to reach the center of equilibrium (Considering its a uniform platform as mentioned in the question). I really hope this helped even by a little and wish you good luck on your A level exams 😓😓

[@Syeda_Fizzah_Azeem]

how does the hinge have a moment if it's literally the pivot

[@muhdasyraf5243]

pls answer

[@mohammadumerfarooq6199]

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[@faizanalikhan8424]

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[@Heyjudeeeee12321]

ma'am can u explain this question again from scratch

[@sabeenshahid2024]

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[@nekosquealer3423]

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[@Heyjudeeeee12321]

total moment at hinge must be 0 isn't it

[@ETphysics]

Total moment must be zero. Means moment due to hinge friction must cancel out the moment due to weight!

[@Heyjudeeeee12321]

@@ETphysics but ma'am the questions which we did previously didn't had this friction.. Will they mention if there is friction?

[@ETphysics]

Yepp, in this question they say "the hinge is NOT frictionless" and that's our clue there!

[@Heyjudeeeee12321]

@@ETphysics kzbin.info/www/bejne/m3q1anaOm6tniMU ma'am in this video is it work done the product of net force and displacement. is the force: net force

[@Pauline-db1sh]

0.4is from where?

[@professormemes3481]

half of one side, so 0.8 is one side, so half of that is 0.4. We halve it because the block is uniform and the Center of gravity is at the center.

[@physicsteacher2708]

Hi what app do you use?

[@samoraei7579]

it looks like one note