Draw a Balance Scale with Three Weighted Objects

How to use this drawing lesson

This lesson teaches a drawing convention for a balance scale that holds three distinct objects in its pans, with weight cues that make the comparison readable. You will plan the scale, place the objects, and check the drawing against a rubric that allows different lettering and object styles. The focus is on clear placement and weight cues, not realistic shading or reading measurements. The free kit below includes a reference plate with a blank redraw panel, a one-page worksheet with all four tasks, and a separate worked answer key.

Set the drawing convention

Use a simple line convention: a horizontal baseline for the ground, a vertical post, a horizontal beam, and two pans hanging from the beam ends. Draw the beam as a straight line and mark its center point. The pans are shallow curves or trapezoids, not deep bowls. Objects sit inside the pan outline, touching the pan floor.

For weight cues, write a small number and unit beside each object, such as 2 kg, 1 kg, and 0.5 kg. These are hypothetical examples; choose your own simple values that add up clearly. Keep units consistent. The scale is balanced when the total weight on each side is equal. If the totals differ, tilt the beam slightly toward the heavier side and show the pans at different heights.

1. Draw the baseline and the vertical post at the center.
2. Draw the beam as a straight line through the top of the post; mark the center point.
3. Draw two pan outlines hanging from the beam ends, using shallow curves.
4. Place three distinct objects: two in one pan and one in the other, or one and two.
5. Write a weight cue beside each object with a number and unit.
6. Check the totals; if equal, keep the beam level; if not, tilt toward the heavier side.

Place three objects with clear weight cues

Choose three objects that are easy to distinguish by outline: for example, an apple (round with a stem), a block (rectangle), and a marble (small circle). Place two objects in the left pan and one in the right pan, or vice versa. Leave a small gap between objects so their outlines do not merge. Each object should sit on the pan floor, not float.

Weight cues must be readable: place the number and unit just above or beside each object, not overlapping the outline. Use the same handwriting style for all cues. If you use abbreviations, define them once in a small key at the bottom. The drawing is valid if a reader can identify three objects and compare the totals without guessing.

1. Sketch the three object outlines lightly inside the pans.
2. Adjust spacing so each outline is separate and touches the pan floor.
3. Write each weight cue in the same style and size.
4. Add a small key if you use abbreviations.
5. Erase extra guide lines and darken the final outlines.

Check balance and tilt

Add the weight cues on each side. If the totals are equal, draw the beam level and the pans at the same height. If the totals differ, tilt the beam toward the heavier side by a small angle, and lower that pan slightly. The tilt should be visible but not extreme; a slight slope is enough to show the comparison.

Use simple arithmetic to check: for example, left pan 2 kg + 1 kg = 3 kg; right pan 3 kg = 3 kg, so the beam is level. If the right pan were 2.5 kg, the left side is heavier, so tilt left. Keep all units the same. Do not invent printer tolerances or hardware standards; measure your own paper and pencil if needed, and label any chosen numerical values as hypothetical examples.

1. Write the total for each pan beside the beam.
2. Compare the totals using the same unit.
3. If equal, keep the beam level; if not, tilt toward the heavier side.
4. Adjust pan heights to match the tilt.
5. Recheck that all three objects are still inside their pans.

Refine for clarity

Darken the scale outlines and object outlines. Keep weight cues smaller than object outlines so they do not dominate. If an object outline is ambiguous, add one simple detail: a stem for the apple, a corner mark for the block, a highlight dot for the marble. Avoid realistic shading; the goal is a clear diagram.

Check that the drawing shows exactly three objects, two pans, one beam, and one post. The baseline should be level. The beam center should align with the post. If you tilted the beam, the center point stays on the post. A reader should be able to state which side is heavier or that the scale is balanced.

1. Darken final lines and erase construction marks.
2. Add one simple detail per object if needed for identification.
3. Verify the beam center aligns with the post.
4. Verify exactly three objects are visible.
5. Write a one-sentence caption stating the balance result.

Worked example

Draw a balance scale with three objects: an apple at 2 kg and a block at 1 kg in the left pan, and a marble at 3 kg in the right pan. Show whether the scale is balanced or tilted.

Left total: 2 kg + 1 kg = 3 kg. Right total: 3 kg. Totals are equal, so draw the beam level and both pans at the same height. Place the apple and block side by side in the left pan with a small gap, and the marble centered in the right pan. Write each weight cue beside its object in the same style. Add a caption: 'Balanced: 3 kg = 3 kg.'

Four exercises with answers

Check your drawing

• Exactly three distinct objects are visible, each inside a pan.
• Two pans, one beam, one post, and a level baseline are present.
• Each object has a readable weight cue with a number and unit.
• Totals on each side are shown or implied and match the beam tilt.
• If balanced, the beam is level and pans are at equal height; if tilted, the heavier side is lower.
• Object outlines are separate and touch the pan floor.
• Weight cues do not overlap object outlines and use a consistent style.
• Valid alternatives in lettering, object style, and simple details are accepted if clarity is preserved.

Common mistakes

Drawing the pans as deep bowls so objects are hidden.

Use shallow curves or trapezoids and keep object outlines above the pan rim.

Writing weight cues that overlap object outlines.

Place cues beside or above objects with a small gap, using one consistent style.

Tilting the beam without changing pan heights.

Lower the heavier pan slightly and raise the lighter pan to match the tilt.

Using mixed units such as kg and g without conversion.

Convert all cues to one unit before comparing totals.

Frequently asked questions

Must the scale be balanced?

No. The drawing may show a balanced scale or a tilt toward the heavier side. The key is that the weight cues and tilt agree.

Can I place all three objects in one pan?

No. The brief requires objects placed in the pans to show weighting; use both pans so a comparison is visible.

Do I need realistic shading?

No. This lesson excludes realistic shading studies. Use clear outlines and simple details for identification.

What if my handwriting differs from the example?

Letter styles vary. The rubric allows valid alternatives as long as cues are readable and consistent.

More free drawing practice

• All free drawing practice