Write a risk assessment for Meter Ramp x1 Plastic Cup x1 Marbles x3 (Small, Medium, Large) Meter Ruler x1 Stopwatch x 1 Electronic Balance x1 Protractor x

A suitable risk assessment for this classroom physics experiment should identify each task step, the hazards present, where they occur, the likelihood of injury, the severity of injury, and any PPE needed. The source documents describe a PPE hazard assessment as an evaluation that includes the tasks being done, the hazards, where they are located, the likelihood of injury, the severity of injury, and the PPE necessary. For a meter ramp, plastic cup, marbles, ruler, stopwatch, balance, and protractor experiment, the main hazards are low-energy physical hazards rather than chemical or high-temperature hazards, so the assessment should focus on impact, rolling, pinch, trip, and small-object risks, then document the controls and certification details required by school laboratory procedures. [6] [11] [7]

Hazard identification and typical controls for this experiment:

• Small object choking hazard: marbles are small enough to present a choking risk, especially for younger pupils or anyone who mouths objects. Control by restricting the activity to age-appropriate students, giving a clear 'no marbles in mouth' instruction, counting marbles in and out before and after the lesson, and maintaining close supervision.
• Rolling object hazard: marbles can roll unexpectedly off benches or onto the floor, creating slip or trip hazards and minor impact hazards to feet. Control by using a tray, lip, or stop block at the end of the ramp, keeping only one marble in motion at a time, retrieving escaped marbles immediately, and keeping walkways clear.
• Trip hazard: meter ramps, rulers, bags, stools, and dropped marbles can obstruct movement around benches. Control by setting up away from main walkways, marking a clear working zone, keeping school bags off the floor, and stopping the activity until any dropped marble is recovered.
• Equipment stability hazard: the ramp can slip or collapse if poorly supported, and the cup or balance can be knocked from the bench. Control by placing apparatus on a stable bench, securing the ramp angle before release, checking that the support point is firm, and keeping the balance away from the ramp runout path.
• Impact or pinch hazard: fingers can be pinched while adjusting the ramp or struck by a moving marble at the bottom of the ramp. Control by adjusting apparatus slowly, keeping hands clear of the marble path, and using the cup or a barrier as the catcher.
• Manual handling hazard: although equipment is light, awkward carrying of meter rulers, ramps, or multiple items can cause minor strains or collisions. Control by carrying one setup at a time, holding long items vertically or close to the body, and having students transport equipment under instruction.
• Misuse hazard: throwing marbles, sword-fighting with rulers, or swinging the ramp creates unnecessary risk. Control by enforcing laboratory behavior rules, stopping unsafe behavior immediately, and removing equipment from any student who misuses it.

[7] [7] [14] Using the risk-priority approach in the source documents, most hazards in this experiment are normally low to medium risk when standard classroom controls are in place. A dropped or rolling marble is typically a minor-injury hazard with possible or occasional probability, so it should be treated as a medium risk until controls are applied, then reduced to low. Equipment instability or unsafe behavior can also be medium risk because they are unacceptable unless controlled. Any situation where apparatus is unstable, students are unsupervised, or marbles are being misused should be corrected before the activity continues. In practice, the teacher should record initial risk, apply controls, and confirm the residual risk is acceptable for a supervised school lesson. [13] [13] [9]

Safe operating procedure:

1. Inspect the apparatus before use. Check that the meter ramp is not cracked or warped, the ruler edges are smooth, the cup is intact, and the balance and stopwatch are in good condition.
2. Set up on a stable bench away from the classroom traffic route. Fix the ramp angle with a secure support and verify that it cannot slide during release.
3. Place the plastic cup or another suitable stop at the end of the ramp so the marble is captured and cannot continue onto the floor.
4. Keep only the equipment needed for the current run on the bench. Store spare marbles in a container so they cannot roll away.
5. Explain the method before starting: one student releases the marble, one times, one records, and no one reaches across the ramp while a run is in progress.
6. Release one marble at a time from the agreed start point. Do not push the marble forcefully; use a consistent release to avoid unpredictable motion.
7. Retrieve marbles immediately after each run. If a marble falls to the floor, stop movement nearby and pick it up before continuing.
8. Use the electronic balance on a separate stable area of the bench, away from the ramp path, to avoid knocks or dropped equipment.
9. At the end of the lesson, count all marbles back in, dismantle the ramp carefully, and return long items and small objects in a controlled manner.

[8] For PPE, this experiment usually requires minimal PPE because the hazards are low-energy and can mostly be controlled by setup, supervision, and good working practices. The documents emphasize that engineering, work-practice, and administrative controls should be used before PPE, and that PPE is only a supplementary method. In a normal school laboratory, closed-toe shoes are advisable to protect against dropped or rolling objects and to reduce slip risk. Eye protection is not usually mandatory for a simple marble ramp experiment unless there is a realistic chance of marbles rebounding toward faces, in which case safety glasses may be justified by the local school policy. Gloves, hearing protection, respiratory protection, head protection, and special torso protection are generally not required for this activity. [3] [5] [14]

Supervision should be direct and active. A competent teacher or laboratory supervisor should brief students before the activity, monitor behavior throughout, and intervene immediately if marbles are thrown, apparatus becomes unstable, or the floor becomes obstructed. Younger students or students with additional support needs require closer supervision because of the small-object choking risk and the greater likelihood of unsafe handling. Students should not set up or modify the ramp angle without instruction. Good practice is to limit group size at each station so the supervisor can clearly observe releases, timing, and retrieval of marbles. [4] [10]

For documentation and compliance with school laboratory health and safety requirements, prepare a written risk assessment or JHA-style record for the experiment. It should identify the task, location, hazards, persons at risk, severity, probability, risk code, control measures, PPE decision, supervision arrangements, and emergency actions for minor incidents such as slips or finger pinches. The record should also include a certification section with the workplace or school laboratory name, assessor, and date. In school practice, this should sit within the laboratory safety management system, be communicated to staff, and be reviewed if the setup changes, if younger pupils use it, or if any incident or near miss occurs. [12] [1] [2]

Practical overall conclusion:

This classroom experiment is generally suitable for routine school laboratory use if it is treated as a low-complexity physical activity with clear controls: stable setup, one marble released at a time, immediate retrieval of dropped marbles, closed-toe footwear, no horseplay, and active teacher supervision. The most important specific issues are the small-object choking hazard, rolling marble slip/trip hazard, and apparatus stability. With those controls documented and enforced, the residual risk is typically low and consistent with normal school laboratory health and safety expectations.