Lab skills / Triple beam balance / Dedicated lab room

A zeroed mechanical triple-beam balance with an empty pan is highlighted by a holographic level line. — With the pan empty and riders at zero, check that the balance pointer aligns with its zero mark before placing a sample on the pan.

← RETURN TO LESSONLAB DOSSIER / GUIDED VIDEOENGLISH VOICEOVER · CAPTIONS

LAB SKILLS · GRADES 4–8

Balance the mass

INVESTIGATION QUESTIONHow does rider position build a mass measurement?

● ILLUSTRATIVE SCIENCE MODEL

ENGLISH CAPTIONS

Move every rider to zero, check pointer alignment before measuring.

0.0 / 3.0 s

01 / SCIENCE

What explains the result?

A balance adds calibrated rider values; the beam must be zeroed before a reading is trusted.

02 / EVERYDAY CONNECTION

Where does this matter?

Careful mass measurements support recipes, lab calculations, and manufacturing tolerances.

03 / MODEL LIMIT

What should you keep in mind?

A balance that is not level or zeroed adds a systematic error.

Continue to the interactive experiment ↓

A gloved hand slides riders along the hundreds, tens and tenths beams of a mechanical triple-beam balance. — Move the riders along their beams until the balance pointer returns to its reference position; each beam contributes part of the total mass.

YOUR TASK

How does rider position build a mass measurement?

Balance the mass: experiment-specific laboratory scene

READ THE BENCH CARD

Balance the three riders

Adjust the hundreds, tens, and ones riders. Their sum must bring the beam to its balance point. A balance that is not level or zeroed adds a systematic error.

MATERIALS / DATATriple-beam balance · Calibration mass · Object

RIDER POSITIONS

Hundreds beam0 g

Tens beam0 g

Ones beam0 g

TARGET MASS137 g

Slide each rider until the beam is level. Add the three beam readings.

WHAT TO TAKE AWAY

A balance adds calibrated rider values; the beam must be zeroed before a reading is trusted.

WHERE THIS IS USED

Careful mass measurements support recipes, lab calculations, and manufacturing tolerances.

MODEL LIMIT A balance that is not level or zeroed adds a systematic error. The activities on this page do not store classroom measurements.

A balanced triple-beam instrument sits above three holographic readout cards that add the large, middle and fine readings. — Once balanced, add the readings from all three beams and record the total mass with the correct unit.