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Learn Mechanical Engineering

Forces, motion, heat and machines, and how engineers design things that hold up.

Free to start. Built from a single prompt. No credit card.

Mechanical engineering is the design and analysis of anything that moves or carries load, from bicycle frames and pumps to engines and robots. Its backbone is a sequence of subjects: statics, dynamics, mechanics of materials, thermodynamics, fluid mechanics and heat transfer, which come together in machine design. Beginners start with free-body diagrams and force equilibrium, the skill every later course relies on, and learn computer-aided design along the way. Learnr creates a mechanical engineering course from a prompt and teaches it through short, interactive lessons with worked problems.

How to learn Mechanical Engineering, step by step

Get fluent with free-body diagrams. Isolate a body, draw every force and moment acting on it, and apply equilibrium equations. Practice on trusses, frames and simple machines until setting up the diagram is fast, because most errors in later courses start with a bad one.
Move from statics to dynamics. Apply Newton's second law, work and energy, and impulse and momentum to moving particles and rigid bodies. Rotating bodies need moments of inertia, so practice computing them for common shapes.
Learn how materials carry load. Study stress, strain, Young's modulus and the stress-strain curve, then bending, torsion and buckling. Draw shear and moment diagrams for beams and calculate deflection, then compare with a real ruler bending over a table edge.
Tackle thermodynamics and fluids. Learn energy balances, entropy and the ideal cycles behind engines, power plants and refrigerators. In fluids, cover pressure, buoyancy, Bernoulli's equation and the Reynolds number that separates smooth from turbulent flow.
Learn CAD and how parts are made. Model parts in a tool like Fusion 360, Onshape or SolidWorks, and learn tolerances, fits and the basics of machining, casting and 3D printing. Designing something you can actually print reveals what drawings leave out.
Practice problems constantly. Mechanical engineering is learned by solving problems, not reading about them. A few Learnr problems a day, with streaks to keep the habit, keep statics and thermodynamics fresh as you go deeper.

What you'll learn

Draw free-body diagrams and solve for forces in static structures
Calculate stress, strain and deflection in beams and shafts
Apply the first and second laws of thermodynamics to engines and refrigerators
Use conservation of mass and energy in simple fluid flow problems
Model a part in CAD and dimension it so it can be made

What's inside your Mechanical Engineering course

A sample path Learnr builds for Mechanical Engineering. Your real course adapts to your goal and level.

1. Statics and free-body diagrams
2. Dynamics of particles and rigid bodies
3. Mechanics of materials
4. Thermodynamics
5. Fluid mechanics and heat transfer
6. Machine design, CAD and manufacturing

How long does it take to learn Mechanical Engineering?

Statics and introductory mechanics of materials take about 3 to 6 months at 5 hours a week. The full core sequence matches an accredited four-year degree, and in the US professional sign-off on public work needs a Professional Engineer license after years of supervised practice.

What you need before you start

Algebra, trigonometry and introductory physics. Calculus and differential equations are required for dynamics, thermodynamics and fluids beyond the introductory level.

Common mistakes to avoid

Skipping or rushing free-body diagrams, which produces missing forces and wrong signs in nearly every later calculation.
Ignoring units. Mixing pounds-force, newtons and inches with meters causes large errors, so carry units through every line.
Designing a part in CAD without thinking about how it will be made, leading to features no machine or printer can produce.

How Learnr builds your course

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Mechanical Engineering questions, answered

What is the hardest part of mechanical engineering?

Many students find fluid mechanics, thermodynamics and dynamics the toughest because they combine abstract concepts with calculus. Strong statics and math skills make all of them easier.

Do mechanical engineers need a license?

Many work in industry without one, but a Professional Engineer license is needed to sign off on certain public and regulated designs. In the US it requires an accredited degree, the FE and PE exams and supervised experience.

Which CAD software should I learn first?

Any major parametric CAD tool teaches transferable skills. Fusion 360 and Onshape have free options for hobbyists and students, while SolidWorks is widely used in industry.