IB Physics SL Extended Essay Example

The student establishes a clear real-world purpose and keeps the topic consistently tied to propeller performance.

The student's investigation includes a substantial methodology with repeated trials, controlled variables, uncertainty treatment, and a complementary computational model.

The student narrows the scope to static testing and defines the performance measure early, which helps the reader follow the direction of the work.

The central measure the student chose becomes mathematically problematic at very low power, which weakens how well the question can be answered.

The investigation does not fully separate blade number from other geometric changes such as solidity, blade area, and balance.

Some parts of the method are only partially convincing because the simulation assumptions and experimental limitations are not fully aligned.

The student uses a wide range of relevant physics ideas and vocabulary, including thrust, torque, induced flow, Reynolds number, and uncertainty.

The student's explanation of the aerodynamic reasoning shows that they understand how the variables in the investigation connect to the underlying physics.

The student makes good use of sources and their own data to support the theoretical framework.

Several symbols, units, and notations are inconsistent or incorrect, which weakens confidence in the mathematical communication.

Some derivations and substitutions are not fully secure, so the theoretical presentation is not always reliable.

The distinction between idealized theory and the real motor-propeller system is not always handled clearly enough.