About Mechanical Comprehension

Mechanical Comprehension evaluates your understanding of basic mechanical and physical principles. Questions cover simple machines (levers, pulleys, gears, inclined planes), force and motion, fluid dynamics, and structural support concepts. On the CAT-ASVAB, you have approximately 20 minutes for 15 questions. This section requires both conceptual understanding and the ability to apply physics principles to practical situations. MC contributes to several important composite scores including MM (Mechanical Maintenance), CO (Combat), and FA (Field Artillery), making it essential for many military technical and combat roles.

Topics Covered

Simple Machines (Levers, Pulleys, Gears)
Inclined Planes & Wedges
Force, Work & Energy
Newton's Laws of Motion
Friction & Gravity
Fluid Mechanics & Hydraulics
Pressure & Pascal's Law
Structural Support & Load
Mechanical Advantage
Rotational Motion & Torque

Sample Questions

Sample Question 1
A force of 100N is applied to a piston with area 5 cm². What pressure is generated?
  • 20 N/cm²
  • 50 N/cm²
  • 500 N/cm²
  • 0.05 N/cm²
Pressure = Force/Area = 100N/5cm² = 20 N/cm².
Sample Question 2
What happens to pressure in a fluid as depth increases?
  • Decreases
  • Stays the same
  • Increases
  • Fluctuates
Fluid pressure increases with depth due to the weight of fluid above.
Sample Question 3
A screwdriver is an example of which simple machine?
  • Lever
  • Wheel and axle
  • Wedge
  • Inclined plane
A screwdriver uses the wheel and axle principle - the handle (wheel) turns the shaft (axle).

Study Tips for Mechanical Comprehension

Understand Mechanical Advantage

Know how simple machines multiply force. For levers, pulleys, and gears, understand the trade-off between force and distance.

Visualize the Problem

Many MC questions include diagrams. Practice reading mechanical diagrams and visualizing how forces act on objects.

Review Newton's Laws

Newton's three laws of motion are fundamental. Understand how they apply to everyday mechanical situations.