IGCSE Physics Practical Skills 6: Moments, Springs and Oscillations
Cambridge IGCSE Physics practical notes on moments, centre of gravity, load-extension graphs, spring constants, pendulums, periods, and evaluation.
Q: What does IGCSE Physics Practical Skills 6: Moments, Springs and Oscillations cover?
A: It gives a complete Paper 5 and Paper 6 preparation route for the named skill, including apparatus, variables, data, safety, and evaluation.
Aim
Investigate equilibrium, elastic extension, or oscillation period using controlled geometry and repeated measurements.
Apparatus and setup
- metre rule, pivot, masses, and mass hangers
- spring, clamp stand, pointer, and vertical scale
- pendulum bob, light string, protractor, and stopwatch
- set square and safety tray where falling masses are possible
Draw the apparatus as a working scientific diagram: use straight lines, label the parts that affect the method, and show where measurements are taken. Do not add decorative detail.
Method
- Secure the stand and establish a zero or unloaded reference reading.
- Change load, distance, or pendulum length across a safe sensible range.
- Measure perpendicular distance for moments, extension from the original length for springs, or length to the bob centre for pendulums.
- Release without a push and time several complete oscillations when measuring period.
- Repeat readings and plot the relationship requested.
- Identify the proportional region, balance condition, or trend without extrapolating beyond the data.
Variables
- Independent variable: force, pivot distance, spring load, or pendulum length.
- Dependent variable: balancing force, extension, or period.
- Controls: spring, oscillation amplitude, release method, mass, pivot, and measurement reference.
A control variable is not just something kept the same. State how it is kept the same so another student could repeat the comparison.
Recording and processing results
Record original and loaded readings separately before calculating extension. For oscillations, record cycle count, total time, and calculated period. Graph headings must name the quantity and unit.
Use one table for raw readings and calculated values when the relationship is simple. Put each unit in the heading, not in every cell. Preserve the instrument precision in raw data and round calculated values only at the end.
Safety
Use a stable stand, add masses gently, keep feet clear of falling masses, use a catch tray, and keep oscillations small and controlled.
