Key relationship
mleft gℓleft=mright gℓright.
Physics · Practical apparatus
Metre-scale moments
Support a metre scale at its own centre of mass so its weight creates no moment. Adjust suspended masses or pivot distances to balance clockwise and anticlockwise moments.
Open the interactive experiment →Metre-scale moments
அளவுகோலின் நிறை மையத்தில் தாங்கினால் அதன் எடைக்கு திருப்புத்திறன் இல்லை. இருபுற நிறை×தூரம் சமமாக வேண்டும்.
Key notes, relationships and model limits
Practical tip
Support a metre scale at its own centre of mass so its weight creates no moment. Adjust suspended masses or pivot distances to balance clockwise and anticlockwise moments.
Common trap
Measure each lever arm from the pivot, and include the metre scale’s own weight when its centre of mass is offset.
Model limits
rigid scale, pivot at centre of mass, point hanging loads, no pivot friction.
What you will learn
Adjust metre-scale moments apparatus, observe its reading and derive the indicated physical quantity.
Try the experiment
Try both scenarios, change one control, and predict the result before checking the graph and readouts.
Think of it this way
Change one input while keeping the others fixed, as you would in a controlled experiment.
Worked example
100×20=200×10 in g cm; both moments are 0.1962 N m.
Why this matters
The model connects metre-scale moments with an observable reading. Check the equation and assumptions before applying it.
Before you start
SI units · algebra · graph reading
Check your understanding
100 g at 20 cm balances which mass at 10 cm?
- 100 g.
- 200 g.
- 50 g.
Read the explanation
200 g.
Course connection: Virtual apparatus preparation. Check exact board/exam membership in the syllabus sources. Physical practical work remains necessary.