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Mechanics: Forces, Motion and Energy

Seventeen chapters, from vectors and Newton's laws to orbits. Every problem is solved in steps: choose the axes, draw the forces, write the equations with units, then solve, and each step is checked.

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5,673,659+ learners enrolled

94 lessons93 challenges415 quiz questions

Watch the physics move

Every lesson draws its situation, and the motion plays out on screen. Here are six from the course.

  • A crate slides down a 30° ramp and speeds up as it goes.

    Inclines

    A crate slides down a 30° ramp and speeds up as it goes.

  • A ball launched at 50°: equal-time ghosts show it slow on the way up and speed up on the way down.

    Projectiles

    A ball launched at 50°: equal-time ghosts show it slow on the way up and speed up on the way down.

  • A moving cart rolls toward one at rest: the start of every collision problem.

    Momentum

    A moving cart rolls toward one at rest: the start of every collision problem.

  • A block on a spring swings back and forth about its rest position.

    Springs

    A block on a spring swings back and forth about its rest position.

  • A pendulum swings through its lowest point, fastest at the bottom.

    Pendulums

    A pendulum swings through its lowest point, fastest at the bottom.

  • A satellite circles the Earth, held on its path by gravity.

    Orbits

    A satellite circles the Earth, held on its path by gravity.

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Syllabus

1 sections94 lessons93 challenges415 quiz questions

This section is part of the Physics Journey. The full syllabus has more sections: click any preview below to view it on the Journey page.

  1. Section 1

    Mechanics

    Start sectionStartExpandCollapse    Forces, motion and energy from zero: vectors and Newton's laws, friction and inclines, kinematics and projectiles, work and energy, springs, momentum and collisions, circular motion, simple harmonic motion and gravitation.94 lessons163 challenges415 questions

    Vectors and Newton's Laws

    11 lessons1954

    Friction

    5 lessons924

    Inclined Planes

    6 lessons1130

    Kinematics in 1D

    6 lessons1130

    Vertical Motion

    4 lessons718

    Projectile Motion

    5 lessons924

    Kinematics and Newton

    4 lessons718

    Project: Delivery Drone

    5 lessons5

    Work and Energy

    7 lessons1336

    Springs

    4 lessons718

    Elastic Energy

    4 lessons718

    Impulse and Momentum

    6 lessons1130

    Momentum in 2D

    4 lessons718

    Circular Motion

    6 lessons1130

    Simple Harmonic Motion

    6 lessons1129

    Gravitation

    8 lessons1538

    Final Challenges

    3 lessons3
  2. Section 2Electricity and Magnetism51 lessons
View the full Physics Journey syllabus
What you get
Everything you'll use to learn physics

Learn by Solving

Solve every problem the way physicists do: choose your axes, draw the forces, write the equations with units, and the board checks each step.

Physics board
Newton's laws
Draw every force on the body, pick your axes, then write Newton's second law along them.F - f_k = m aF = 20 N, f_k = 5 N, m = 5 kga = 3 m/s²

Draw every force on the body, pick your axes, then write Newton's second law along them.

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Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Physics is better with friends!

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Every way to learn

Read, listen, test yourself, ask the AI about your own steps, or look up anything you've already covered. Every lesson meets you where you are.

What is a Vector?
Audio

A scalar is a size only, like a mass of 3 kg or a time of 4 s. A vector has a size and a direction.

A force is a push or a pull, measured in newtons: a push of 50 N to the right is a vector.

A vector is drawn as an arrow. Its length shows the size, and the arrow points in its direction.

1xSarah

Earn a Certificate

Earn a certificate when you complete a section. Add it to your LinkedIn profile to show how far your physics has come.

CoddyCertificate of Completion
This certifies thatJohn Doehas successfully completed
physics iconPhysics Mechanics
Verified
DateJan 2026
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Why learn mechanics with Coddy

  • Free-body diagrams you draw yourself. Drag each force onto the body, and a missing or extra force is named.
  • Axes you choose. Flat or along the slope, either direction positive: the check follows your choice, as a teacher would.
  • Units are part of the answer. A missing or unconverted unit is a wrong answer, the way it is on an exam.
  • Motion you can watch. Ramps, projectiles, collisions, springs, pendulums and orbits move on screen, so every number has a picture.

Frequently asked questions about mechanics

What does the mechanics section cover?

Vectors and Newton's laws, friction, inclined planes, motion in one dimension, free fall, projectiles, work and energy, springs and elastic energy, impulse and momentum in one and two dimensions, circular motion, simple harmonic motion and gravitation, with a delivery drone project and three final challenges.

How do you solve a mechanics problem?

Draw the body and every force on it, choose your axes and a positive direction, split any slanted force along them, write Newton's second law along each axis, then solve for the unknown with its unit. Each problem in this section walks those steps in that order.

What is a free-body diagram?

A drawing of one object with an arrow for every force acting on it, and nothing else. It is the first step of almost every mechanics problem, and the step most mistakes come from.

How long is the mechanics section?

Seventeen chapters and 94 lessons, each a few minutes long. Finishing it earns a free, verifiable certificate.

What's the fastest way to learn Mechanics?

Write Mechanics every day. Coddy's course is structured exactly for that: short interactive lessons, immediate exercises, and AI hints when you stall. You spend more time coding Mechanics than waiting on long video lectures.

Do I get a Mechanics certificate when I finish?

Yes. When you complete the Mechanics course you receive a free certificate of completion that you can share on LinkedIn or add to your resume.
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