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Mechanics
In mechanics you remember principles, formulas for forces, moments and energy, with their units. Lumi has you recall them so you can set up a problem without hunting for the law.
How to turn this subject into cards
Mechanics asks you to remember a small number of principles and apply them to many situations. Make a card set per principle (dynamics, energy, moments), with its statement, formula, units and conditions. Add a method card, isolate the system, draw the free-body diagram, choose axes, write the equation. The classic trap is forgetting a force or a sign, which no card fixes alone. Lumi quizzes you on the principles and on the order of the steps. Quizzing instead of rereading gave a lasting advantage in a classic study (Roediger and Karpicke, 2006).
Example card
Try it, Lumi turns it into fill in the blank questions in your browser.
Mechanics · teach this card to Lumi
Newton’s second law says the resultant force equals mass times acceleration. A body is in equilibrium when the net force and the net moment are both zero. The moment of a force is the force times its perpendicular distance from the pivot. Work done equals force times the distance moved in the direction of the force. Power is measured in watts.
Lumi’s question
Newton’s second law says the _____ equals mass times acceleration.
Pick the missing word
Answer right to light Lumi up
Its lamp fades when a fact slips away.
Levels where Lumi offers this subject
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Teach this to Lumi
Give Lumi your mechanics notes, it gives them back as questions at the right moment.