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๐Ÿงฒ PhysicsGrade 7

Moments of a Force

Objective: To define the moment of a force and to use the principle of moments.

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What is a moment?

The turning effect of a force is called a moment. The size of the moment depends on the force applied and how far it is from the pivot. Moment = force ร— perpendicular distance from the turning point (pivot). Force is measured in newtons (N), distance in metres (m), so the moment is measured in newton metres (Nm).

๐Ÿ“– Moments of Force โ€” Slide 2

The Principle of Moments

The Principle of Moments states that when a body is balanced (in equilibrium), the total clockwise moment about a fixed point (pivot) equals the total anticlockwise moment about the same fixed point.

๐Ÿ“– Moments of Force โ€” Slide 3

Interactive Seesaw โ€” feel the moments

drag a weight to change its distance
3m2m1m1m2m3mRam200NShyam300N
Ram200N ร— 1.5m
Shyam300N ร— 1m
Anticlockwise
300 Nm
Status
โš–๏ธ Balanced
Clockwise
300 Nm
Live from the seesaw: anticlockwise โ€” Nm vs clockwise โ€” Nm โ€” loadingโ€ฆ
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Practice Zone

Easy๐Ÿ”ฅ streak 0

A force of 70 N turns a lever 0.4 m from the pivot P. Calculate the moment. State value, unit and direction (clockwise).

โœ“ Graded instantly & deterministically โ€” value, unit and direction checked by rules, not by an AI guess.
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