Using Moments - Equilibrium (Edexcel A-Level Mathematics): Quizzes

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Using Moments - Equilibrium
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If friction at B is 60 N60 \text{ N} horizontally, what is wall reaction at A?

60 N60 \text{ N}

For an 88 m uniform ladder, where is the centre of mass from an end?

44 m from end

Approx mass from m=60⋅8⋅sin⁡70∘4⋅cos⁡70∘m = \frac{60 \cdot 8 \cdot \sin 70^\circ}{4 \cdot \cos 70^\circ}?

33.64 kg

Which trig function appears for weight moment in ladder eqn?

cos⁡70°\cos 70°

Taking moments about pivot removes which forces?

Forces through pivot

From 1.5×20=Tsin⁡θ×31.5 \times 20 = T \sin\theta \times 3, TT approximately equals?

31.62 N

Which equilibrium condition balances horizontal forces?

∑Fx=0\sum F_x = 0

Which equilibrium condition balances vertical forces?

∑Fy=0\sum F_y = 0

If ladder length changes but friction same, how does mm from moments change?

mm unchanged

Friction at B acts in which direction on the ladder?

Horizontally toward wall

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