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QLDEngineeringQuick questions
Unit 4: Machines and mechanisms
Quick questions on Mechanical advantage, velocity ratio and efficiency for QCE Engineering Unit 4
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 mechanical advantage?Show answer
Mechanical advantage (MA) measures how much a machine multiplies the input force:
What is velocity ratio?Show answer
Velocity ratio (VR), also called the movement ratio, is set purely by the machine's geometry:
What is the four types of motion?Show answer
Machines convert and redirect motion between four types: linear (straight line), rotary (turning about an axis), oscillatory (back and forth through an arc) and reciprocating (back and forth in a straight line). A crank converts rotary motion to reciprocating motion; a rack and pinion converts rotary to linear. Recognising these conversions is part of analysing any mechanism.
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