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QLDPhysicsQuick questions
Unit 2: Linear motion and waves
Quick questions on Uniform acceleration equations (suvat) (QCE Physics Unit 2)
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is applying suvat across a change in acceleration?Show answer
If a car accelerates then brakes, you cannot use one equation across both phases. Split the problem.
What is mixing sign conventions?Show answer
Choosing up as positive then writing $a = +9.8$ in a free-fall problem is the most common QCAA marking deduction.
What is using $g = 10$ when the question says $9.8$?Show answer
QCAA writes problems with $g = 9.8$ m s$^{-2}$ unless otherwise stated. Read the question.
What is forgetting a negative root?Show answer
$v^2 = u^2 + 2as$ gives two solutions for $v$. Pick the physically sensible one (direction of motion).
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