Key relationship
mobject ℓleft=mweights ℓright at null.
Physics · Practical apparatus
Beam balance mass
Add known weights until the corrected pointer reaches zero. Equal arms compare masses directly; unequal arms need a lever-ratio correction.
Open the interactive experiment →Beam balance mass
பீம் தராசில் சமநிலையில் இருபுற திருப்புத்திறன்கள் சமம். சமக் கரங்களில் நிறைகள் சமம்.
Key notes, relationships and model limits
Practical tip
Add known weights until the corrected pointer reaches zero. Equal arms compare masses directly; unequal arms need a lever-ratio correction.
Common trap
A null balance compares moments. Equal masses balance at equal arms; unequal arm lengths require a correction.
Model limits
static two-pan lever calibration; identical pan masses tare out. Pointer is a linear torque indicator.
What you will learn
Adjust beam balance mass 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
If right arm is 12 cm and left arm 10 cm, 50 g standards balance a 60 g object.
Why this matters
The model connects beam balance mass with an observable reading. Check the equation and assumptions before applying it.
Before you start
SI units · algebra · graph reading
Check your understanding
An equal-arm balance reaches null with 50 g standards. Object mass?
- 100 g.
- 50 g.
- 25 g.
Read the explanation
50 g.
Course connection: Virtual apparatus preparation. Check exact board/exam membership in the syllabus sources. Physical practical work remains necessary.