Last updated on Oct 23, 2026

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

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Using Moments - Harder

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Rod $4m$ , weight $6N$ , CM $2.4m$ from A: reaction at B?

$3.6 N$

In problem 2, CM distance from A is?

3.5 m

Units of a moment are given as?

$N m$

To find CM from reactions, take moments about which point?

Either support

Best reason to pick pivot at support with unknowns?

Removes unknowns from moment eqn

Moment eqn about A with length $L$ and CM at $d$ : general form?

$W d = B L$

When equating moments with $g$ present, which cancels?

$g$ (gravity)

For a $4m$ nonuniform rod weight $6N$ , CoM $2.4m$ from A: reaction at B?

$3.6 N$

Bar length $5\text{m}$ , reactions $3\text{N}$ at A and $7\text{N}$ at B: CoM distance from A?

$3.5\text{ m}$

In a nonuniform rod, where does the weight act?

At the centre of mass

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