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QLDPhysicsQuick questions
Unit 2: Linear motion and waves
Quick questions on Linear motion and Newton's laws: QCE Physics Unit 2 Year 11
7short 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 1st law?Show answer
Object at rest stays at rest; in motion stays in motion at constant velocity, unless acted on by net external force.
What is 2nd law?Show answer
$F = ma$. Net force equals mass times acceleration.
What is 3rd law?Show answer
Action-reaction pair: equal and opposite forces on different bodies.
What is substituting before differentiating?Show answer
Not relevant here but a related issue.
What is confusing distance and displacement?Show answer
Distance is path; displacement is net change.
What is sign errors in free fall?Show answer
Choose positive direction, stick to it.
What is inelastic vs elastic?Show answer
Momentum always conserved. Kinetic energy only in elastic.
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