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IB Physics SL 6.4.3 Controlling variables Question Bank

Practise IB Physics SL/HL 6.4.3 by applying controlling variables concepts to exam-style physics questions.

Syllabus
First assessment 2025
Course
Physics SL
Level
SL

Exam points

  • identify the relevant physical quantity, model or diagram
  • apply the correct equation and units to the evidence
  • justify the result using conservation laws, fields or energy relationships

S2.1.3—Controlling variables question 1

[Maximum number: 1]

A group of students uses pressurized air to move a piston that forces a nail into a block of wood. A gauge is used to measure the pressure P of compressed air above atmospheric pressure. The nail enters the wood perpendicular to its surface.

Figure for Question S2.1.3—Controlling variables question 1 — IB Physics SL

The students use a ruler to measure the length of the nail which remains above the surface of the wood as shown. The depth of the nail inside the wood is d. All necessary length measurements are recorded using a ruler with uncertainty ±1 mm\pm 1 \mathrm{~mm}.

Figure for Question S2.1.3—Controlling variables question 1 — IB Physics SL

The students systematically increase the pressure and calculate d.

Table for Question S2.1.3—Controlling variables question 1 — IB Physics SL

State one variable that needs to be controlled when collecting the data.

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