Physics fundamentals - what finally made it click for me

At first I tried to memorize formulas and it was a disaster. The second a problem looked slightly different, I had no idea what to do.

What actually helped was focusing on the basic ideas instead: what velocity really means, what acceleration actually looks like, how forces interact. Once that made sense, the formulas started feeling way more logical.

Also drawing quick little diagrams helped a lot. Physics fundamentals became way easier once I stopped treating it like memorization and more like understanding what’s physically happening.

I had the same experience. Once I stopped trying to memorize every formula and started thinking about what’s actually happening physically, problems became way easier.

Also drawing quick sketches helps a lot - forces, motion, angles, whatever the problem has. A lot of physics students struggle because they memorize equations instead of understanding the ideas behind them, and that usually breaks down when the question changes a bit.

Honestly I had the same moment where physics suddenly “clicked.” For the longest time I was trying to memorize formulas and just plug numbers in, and it never worked. The breakthrough came when I started asking what is physically happening first, before touching any equation.

Two things helped me a lot:

Drawing diagrams for every problem. Free-body diagrams, motion sketches, circuits — once you visualize the forces or motion, the math suddenly makes sense.

Explaining the concept out loud like I was teaching someone else. If I couldn’t explain why a formula worked, I didn’t really understand it yet.

After that physics stopped feeling like random equations and more like a logic puzzle about how the world behaves. Still hard, but way less mysterious

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I’d break physics fundamentals down like this, with the core formulas:

  1. Motion
    How an object moves over time.
    v = s / t
    a = Δv / t
    s = v₀t + ½at²

  2. Force
    Any interaction that changes motion.
    F = ma

  3. Energy
    The ability to do work.
    Eₖ = ½mv²
    Eₚ = mgh
    E = const (conservation of energy)

  4. Momentum
    How hard it is to stop an object.
    p = mv
    p₁ + p₂ = const (conservation of momentum)

  5. Gravity
    Attraction between masses.
    F = G(m₁m₂ / r²)
    F = mg

  6. Thermodynamics
    How heat and energy behave.
    Q = cmΔT
    ΔU = Q − W

  7. Waves
    How energy travels through oscillations.
    v = fλ
    T = 1 / f

  8. Electromagnetism
    How charges interact.
    F = k(q₁q₂ / r²)
    I = q / t
    U = IR

If you actually understand these, the rest of physics becomes way more logical.

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Physics Fundamentals - The most basic formulas you actually need:

v = s/t
a = Δv/Δt

v = v₀ + at
s = v₀t + ½at²

F = ma
W = mg

p = mv
J = FΔt

W = Fd cosθ
Eₖ = ½mv²

P = W/t (The Physics Hypertextbook)