Why a checklist before every lab
A working bench is a place where a careless step can still cause trouble — a cart shoots off a ramp, a just-used bulb burns a finger, a shorted wire heats up, a small magnet or mass ends up underfoot. A pre-lab checklist is not busywork — it is the routine that makes safe, prepared work automatic, so that on the day something rolls, snaps, or sticks the wrong way the student’s hands already know what to do.
It also does something quieter: it forces the student to arrive ready. The most unhelpful lab partner is the one who skimmed the procedure in the hallway. This checklist closes that gap. Print one for every experiment, work top to bottom, and do not pick up a single piece of equipment until the last box is checked.
The goal is not to follow rules. It is to walk to the bench already knowing the hazards, the steps, and the result you expect.
1 — Safety
Nothing below this section happens until everything in it is done. No exceptions, every lab, every time.
- Safety goggles on — over the eyes, not pushed up on the forehead — whenever something can spring, snap, or launch (a stretched spring, a released cart, a rubber band).
- Sleeves clear and long hair tied back around moving carts, spinning wheels, and coils of wire.
- Closed-toe shoes; the floor and the landing zone below a ramp kept clear of bags and feet.
- Hot surfaces flagged — a lamp, a bulb, or anything just heated is treated as hot until checked; let it cool before touching.
- Batteries handled right — never short a battery across bare wire; disconnect the circuit when you are not testing it so the wires do not heat up.
- Small parts and strong magnets kept on the tray — not on the floor or near a mouth, and magnets kept away from screens, phones, and cards.
- Sink, towels, and first-aid kit located — you know where each one is before you start.
2 — Setup
With safety confirmed, build the bench so the work flows without scrambling mid-experiment.
- The full procedure read end to end — not skimmed — so you know what step comes next.
- All equipment gathered, checked, and laid out in order of use — ramp, cart, spring scale, or circuit kit for today.
- The right measuring tool selected to match the precision the step needs — meter stick, ruler, stopwatch, spring scale, or thermometer.
- Balance located and zeroed; you know which masses you need to record and to how many decimal places.
- Circuit parts checked — battery, wires, bulb, and switch tested, so a dead bulb is caught before the run, not during it.
- Ramp on a steady, level edge, or the magnet and iron-filings station set up on a clear surface, with nothing fragile in the way.
- Lab notebook open to a fresh, dated page with the title and question already written.
3 — Readiness: the pre-lab questions
This is the section that separates a button-pusher from a scientist. Before the first measurement, the student should be able to answer these in writing — in the lab notebook, in their own words.
- What is the question? State, in one sentence, what this experiment is trying to find out or measure.
- What is the idea? Write the key relationship the experiment depends on — speed is distance over time, a bigger force gives a bigger push, a circuit needs a complete loop.
- What is my prediction? A specific, numerical expectation — the approximate time down the ramp, the spring-scale reading you expect, whether the bulb will light.
- What am I measuring, and in what units? Name every quantity you will record, its unit, and its uncertainty.
- What could go wrong? Identify the one or two steps most likely to introduce error, and how you will minimize them.
- What does success look like? Know, before you begin, what a reasonable result would be — so an absurd number raises a flag at the bench, not a week later.
A student who answers all six is not guessing their way through a recipe — they are running an experiment they understand, with a result they can already roughly predict. That is exactly the readiness the lab-notebook entry is built to capture, and the kind of preparation a lab defense is designed to reward.