Mechanical reasoning is a small set of rules applied again and again. Two weeks is enough to learn them, practise them one at a time, then mix them together under a clock.
The Rules to Learn First
Write these on one page and keep it beside you for the first week. Understanding each one matters more than memorising the symbols.
- Levers: effort x effort arm = load x load arm (see how levers work).
- Gears: speed out = speed in x teeth in / teeth out; meshed gears turn in opposite directions (see gear ratios).
- Pulleys: effort = load / number of supporting rope sections (see pulleys).
- Pressure: pressure = force / area; liquid pressure depends on depth; hydraulic force scales with area.
- Springs: force = stiffness x extension; parallel is stiffer, series is softer (see pressure, hydraulics and springs).
- Everywhere: a gain in force is paid for in distance, and work in equals work out.
Week One: One Machine at a Time
- Days 1 and 2: levers and balance. Do six to eight questions a day, writing the moment on each side.
- Days 3 and 4: gears, including a direction question and a compound train every day.
- Days 5 and 6: pulleys and springs. Draw the rope sections before you count them.
- Day 7: pressure and hydraulics, then a short review of every mistake from the week.
Keep a mistakes log: one line for each question you missed, saying which slip caused it (flipped ratio, wrong distance, unit mix-up). Patterns show up within days.
Week Two: Mix, Then Time
- Days 8 to 10: mixed sets with no time limit, using the four-step routine from how to solve mechanical reasoning questions on every question.
- Days 11 and 12: timed sets. See how much time you get per question for pacing.
- Day 13: go through the mistakes log and redo only the questions you got wrong.
- Day 14: one light mixed set, then stop.
What a Good Session Looks Like
Short and regular beats long and rare. About 30 to 40 minutes a day is enough, split like this:
- Five minutes: reread your rules page and say each rule in your own words.
- The rest of the session: practice questions on the day's topic, with the rule written down before the numbers every time.
- Five minutes: mark your work. For each miss, note which slip caused it.
- Five minutes: redo one missed question from a previous day without looking at the explanation.
Know When to Move On
Track your accuracy by machine, not overall. A total score hides the fact that you may be strong on levers and shaky on springs.
A sensible rule: when you get eight or nine of ten right on a topic without looking at your rules page, move to the next topic. When you are below that, stay one more day, because gaps compound when topics are mixed.
If You Only Have Three Days
- Day 1: levers and gears, whose ideas the other topics reuse, with the rules and mistakes pages.
- Day 2: pulleys, pressure and springs, then one mixed set.
- Day 3: a timed set, a review of the misses, and rest.
A shorter plan means leaving gaps, so put your effort where you lose the most marks. Your mistakes log is the guide.
Practise the Format You Will Face
The JobCannon mechanical reasoning test describes each setup in words and explains every answer afterwards. Many employer tests show a drawing instead, so add diagram practice in the second week: find the pivot, count the rope sections, trace the drive from gear to gear. The mechanical reasoning practice page has solved examples to start from.
The test you sit may also be timed differently, so check the instructions in your invitation before you set a pace.
The Day Before and the Day Of
- Do one short set and read your rules page once. Do not start a new topic.
- Have scrap paper and a pencil ready if the test allows them, and a calculator if it is permitted.
- Write the rule on your paper before the numbers on every question.
- If one question is taking far too long, make your best choice and move on.
Avoid practice material that promises a guaranteed pass or reveals "the answer pattern" for a test. Marks come from understanding, and the physics in the real test is the same physics you have just reviewed.