Last updated on Sep 21, 2026

Using Moments - Equilibrium (AQA A-Level Mathematics): Flashcards

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Using Moments - Equilibrium

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Normal reaction at wall for ladder at $70°$ with $60$ N friction

$60$ N (horizontal equilibrium)

Mass of $8$ m ladder at $70°$ with $60$ N friction

$33.64$ kg (using moments)

Tension in string for horizontal rod ( $20$ N, $3$ m, $1$ m above hinge)

$31.62$ N

What is the principle of moments at equilibrium?

Sum of clockwise moments = sum of anticlockwise moments

Best pivot point choice when taking moments

Choose where unknown forces act (they produce no moment about that point)

Horizontal force equilibrium condition

$sum F_x = 0$

Vertical force equilibrium condition

$sum F_y = 0$

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