Igcse Model Questions Vol1 2022 Physics Question 1

A student is to determine the acceleration due to gravity (g) using a simple pendulum. The length of the pendulum string is measured with a metre rule and recorded as 0.500 m (to the nearest millimetre). The student uses a stopwatch to time 20 complete oscillations on three separate trials and obtains the following times: - Trial 1: 28.3 s - Trial 2: 28.5 s - Trial 3: 28.4 s Using the data provided, the student must: a) Calculate the average period of one oscillation. b) Calculate the experimental value of g using the formula \(T = 2\pi\sqrt{L/g}\). c) Determine the percentage difference between the experimental value and the accepted value of 9.81 m s⁻². d) List two possible sources of error that could affect the result.