Class 11 Physics simulations · Units and Measurements

Measurement uncertainty

Combine length uncertainties when calculating an area.

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What to notice

For a product, fractional uncertainties add in the worst-case first-order estimate.

Key relation

ΔA/A ≈ ΔL/L + ΔW/W

Try this

Increase length while keeping its absolute uncertainty fixed.

What you can change

• Length: 5 to 30 cm
• Width: 3 to 20 cm
• Uncertainty in each length: 0.1 to 1 cm

More in Units and Measurements

• Dimensional analysis of a pendulum
• Propagating errors: density of a cube
• Parallax: view from the right angle
• Micrometer screw gauge
• Spherometer
• Vernier caliper

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