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IB Physics SL 6.6.2 Evaluating Question Bank

Practise IB Physics SL/HL 6.6.2 by applying evaluating 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

S2.3.2—Evaluating question 1

[Maximum number: 3]

A student studies the relationship between the centripetal force applied to an object undergoing circular motion and its period T.
The object (mass m ) is attached by a light inextensible string, through a tube, to a weight W which hangs vertically. The string is free to move through the tube. A student swings the mass in a horizontal, circular path, adjusting the period T of the motion until the radius r is constant. The radius of the circle and the mass of the object are measured and remain constant for the entire experiment.

Figure for Question S2.3.2—Evaluating question 1 — IB Physics SL

The student collects the measurements of T five times, for weight W. The weight is then doubled ( 2 W ) and the data collection repeated. Then it is repeated with 3 W and 4 W. The results are expected to support the relationship

W=4π2mrT2W=\frac{4 \pi^{2} m r}{T^{2}}

Question (a)

(a)

The measurements of T were collected five times. Explain how repeated measurements of T reduced the random error in the final experimental value of m r.

[ 2 ]

Question (b)

(b)

Outline why repeated measurements of T would not reduce any systematic error in T. provided.

[ 1 ]
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