Lesson 3 of 8 · Lab Skills

Experiment⭐ 30 XP

Systematic and Random Errors

🧪Lab Brief #3

Lab Skills.

🎯 Your mission

Predict it first. Then prove yourself right (or wrong).

⚡ The twist

Nature loves to surprise the careful watcher.

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Mind = Blown

🔬 The more you look, the more nature shows you.

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Make a hypothesis first

Before you start: write down what you think will happen, and why.

What You'll Learn

A systematic error shifts every reading the same way — a zero offset or a mis-calibrated scale — and repeating does not help; only correcting the instrument does. Random error scatters readings both ways, and taking a mean of repeats reduces it.

Key Words

Tap a word to see its definition.

Materials Needed

newton meter
known masses
notebook

Safety First

Support hanging masses so they cannot drop onto feet.

Steps

Step 1 — Read

Read the explanation above and note the two key terms before you start.

Step 2 — Do

Deliberately introduce a zero error on a newton meter and take five readings, then correct the zero and repeat. Compare the two means against a known weight and classify the difference in each set.

Step 3 — Observe

Record what actually happened, including anything that did not match what you expected.

Step 4 — Record

Write a conclusion that answers the question this lesson opened with, and state your uncertainty.

Check Your Understanding

Question 1

1 of 2

Repeating a measurement and averaging reduces:

How sure are you going to be?😐 maybe

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Where you see this in real life

This shows up in your everyday life more than you'd think.

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Stretch Challenge

Try this in real life this week.

Try one experiment in real life this week — even a tiny one.

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For the dinner table

“What's the most surprising thing you learned today?”

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Next Smart Experiment

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