Calculating Moments (OCR GCSE Physics A (Gateway Science Suite)): Flashcards

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Calculating Moments
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Formula for moment

M=FdM = Fd

Balanced system moment condition

Anticlockwise moment = Clockwise moment

Balanced pivot equation (2 forces)

F1×d1=F2×d2F_1 \times d_1 = F_2 \times d_2

Force orientation for moment calculation

Perpendicular to distance from pivot

Units of moment

Nm (Newton metres)

Moment if F=4NF = 4N, d=0.4md = 0.4m

1.61.6 Nm

Meaning of 'balanced' for pivoted system

Moments are equal

First step in moment problem

Draw a diagram

Rearranging F1d1=F2d2F_1 d_1 = F_2 d_2 for d1d_1

d1=F2×d2F1d_1 = \frac{F_2 \times d_2}{F_1}

Distance xx if F1=25NF_1=25N, F2=8NF_2=8N, d2=20md_2=20m

6.4m6.4m

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