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QLDPhysicsQuick questions
Unit 2: Linear motion and waves
Quick questions on Work, kinetic and gravitational potential energy, conservation (QCE Physics Unit 2)
3short 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 forgetting the cosine in $W = Fs\cos\theta$?Show answer
Force at an angle to motion does less work than $Fs$.
What is treating $mgh$ as absolute?Show answer
$PE_g$ is always relative to a chosen reference. State your reference at the start.
What is adding $KE$ and $PE$ separately when energy is lost?Show answer
With friction, total mechanical energy decreases. The decrease equals the work done against friction.
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