S7 Moments lab · MVTTC Virtual Lab

Experiment workspace

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Tip: drag a bottle along the metre rule. Press H for all controls.

Distance left of pivot

Distance right of pivot

Big question: why can a small load far from the pivot balance a big load near the pivot?

Think first, then test it on the balance.

A 1 kg bottle hangs 20 cm left of the pivot.

Where must a 0.5 kg bottle hang on the right to balance the rule?

Distance right of the pivot (cm)

Move or change the bottles. Watch the two turning effects.

Anticlockwise—

Clockwise—

Lock your prediction first

0 readings

No.	Left kg	Left m	Right kg	Right m	ACW N m	CW N m
No readings yet.

Leave the two moment columns empty. Work them out on your results sheet.

Moment = force × perpendicular distance from the pivot.

Worked solution for the present set-up (7 steps)

A 2 kg load hangs 15 cm left of the pivot. Where must a 1 kg load hang on the right to balance it?

Load A is fixed. Drag load B until the rule is level. Five rounds.

Score: 0 / 5

Runs offline. No trainee data is stored or sent. MVTTC · GST 04102 · S7 v3.1 · three.js (MIT licence).

Drag	a bottle along the rule, or the red hand along the spanner
Tap / click	a bottle to select it (it glows)
← →	move the selected bottle 1 cm (hold Shift for 5 cm); spanner: move the hand
↑ ↓	change the selected bottle's mass; spanner: change the force
Mouse wheel	over a bottle: change its mass
Drag the arrow tail	spanner: set the push angle and force
Space	push the spanner
1 2 3	camera: front, 3D, top
F M H	full view, sound on/off, this help