2026–27 · Backup lesson · Spring 2027
Arrange a Stable Garden Load
Adult extension of: Balance and Center of Gravity
Unscheduled alternative · available resource
Find the balance point of a lightweight object, then investigate how moving a load changes stability on a low model. Apply the observations to arranging pots and supplies without requiring anyone to balance their own body.
Curriculum skill focus: Balance, force, spatial awareness, prediction, motor planning
01 · Learning
Objectives
- Find an object’s approximate balance point on a low support.
- Explain how changing mass placement can change balance.
- Choose a low, centered arrangement and identify when extra support is needed.
02 · Preparation
Materials
Light ruler or smooth lightweight strip; low broad support; large light blocks; small stable tray or cart model; removable fastening; soft catch mat; arrangement photos; recording sheet.
03 · Practice
Adult project
- 1
Consider a tray of pots or supplies that tips when lifted. Inspect lightweight model materials and choose arranging, directing, recording, or observing; the activity stays on a tabletop.
- 2
Place the ruler across a low support over a soft mat and adjust slowly until it balances. Mark the approximate position and predict what will happen when a light block is secured near one end.
- 3
Add the secured block and observe the change, allowing only a small controlled tip onto the mat. Move the support to regain balance and record the new position without treating the geometric midpoint as always correct.
- 4
Arrange the same light blocks low and centered on a tray model, then compare a higher or off-center arrangement within a contained safe setup. Observe stability while keeping the support base unchanged and avoiding any heavy falling object.
- 5
Use a diagram to relate the combined center of gravity to the support area. Discuss how motion, a sloping path, or a sudden stop can alter stability, so a still model does not guarantee a safe real carry.
- 6
Build the preferred low, secure arrangement and make a checklist: manageable load, clear view, stable support, clear route, and help if needed. Return materials without testing anyone’s body balance or carrying capacity.
Evidence & interpretation
What the investigation shows
In a uniform gravitational field, an object tends to remain statically stable when the vertical line through its center of gravity falls within its support area. Lowering the center of gravity and widening support generally improve resistance to tipping, but dynamic forces also matter.
Practical connection
Why this work matters
Load placement helps reduce tipped containers and dropped supplies on benches, trays, and garden carts.
Participation by choice
Individual access options
- Direct block placement and support movement while a partner performs the fine-motor work.
- Use large contrasting marks, a tactile stationary model, or verbal descriptions of the balance changes.
- Choose seated observation or diagram planning, decline any movement task, and pause or stop the demonstration when preferred.
Review & transfer
Reflect on the work
- Why did the balance point move after the block was added?
- What would make your stable tabletop arrangement less stable during a real move?