Moments Diagrams (Edexcel A-Level Mathematics): Flashcards

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Moments Diagrams
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What is a moment in mechanics?

A moment is the turning effect of a force.

What does the moment depend on?

Moment = Force ×\times Perpendicular Distance from pivot.

What is the sign convention for clockwise moments?

Clockwise moments are considered negative.

What force has no turning effect at the pivot?

Force B acts into the pivot with no turning effect.

What is the balance point on the seesaw when Jack is 0.50.5 m from B?

Equilibrium condition gives x=0.5x = 0.5 m from B.

What is TCT_C in terms of WW for the pole problem?

TC=(5/6)W+(100/3)T_C = (5/6)W + (100/3) N.

What is the equation for TAT_A in terms of WW?

TA=W/6−20/3T_A = W/6 - 20/3, where WW is the total weight.

What is the relationship between WW and TAT_A in the system?

W=8TAW = 8T_A based on tension conditions.

What should you identify before calculating moments?

Identify the pivot point for moment calculations.

What must be equal for equilibrium?

Sum of clockwise moments = sum of anticlockwise moments.

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