A-LevelPhysicsKinematicsMay/June 2015Paper 1 Q71 Mark
In an experiment to determine the acceleration of free fall g, a ball bearing is held by an electromagnet. When the current to the electromagnet is switched off, a clock starts and the ball bearing falls. After falling a distance h, the ball bearing strikes a switch to stop the clock which measures the time t of the fall. If systematic errors cause t and h to be measured incorrectly, which error must cause g to appear greater than 9.81 m s⁻²?
Ah measured as being smaller than it actually is and t is measured correctly
Bh measured as being smaller than it actually is and t measured as being larger than it actually is
Ch measured as being larger than it actually is and t measured as being larger than it actually is
Dh is measured correctly and t measured as being smaller than it actually is
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The correct answer is D. This question tests the candidate's understanding of kinematics within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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