Change the weights, distances, or gear sizes and watch what happens. These extra labs help you understand the mechanical ideas in the OETT study guide.
Left moment 160 lb·ftvsRight moment 120 lb·ftLeft side drops
Motion slowed for observation
Driver 60 RPMClockwisebecomesDriven 24 RPMCounterclockwiseSlower · more torque
Motion slowed for observation
Load 400 lb÷ 4Ideal pull 100 lbPull 4 ft of rope to lift 1 ft
Try a new problem
Now do it without the sliders.
Aim for 36 sec
Mechanical reasoning
Gears & rotation
Schematic · not to scale
Explore the diagram
1gear: A: 48 teeth
2gear: B: 16 teeth
3direction: A clockwise at 90 RPM
Read the diagramA (48 teeth, 90 RPM clockwise) meshes externally with B (16 teeth). Output speed is unknown.
Non-color cues: written labels and measurements, outlined shapes and arrowheads.
Gears: Direction & Speed
A (48 teeth, 90 RPM clockwise) meshes externally with B (16 teeth). Output speed is unknown. What is B’s speed?
Practice section map
Three sections. One clock.
The full practice test includes 35 English, 20 math, and 45 mechanical questions.
