Muay Thai Strike Impact Simulator

Strike (choose one, then throw)

Pick a strike and press Throw.

Fighter & Bag Setup

Strike power 100%

Heavy bag mass 45 kg

Chain damping Medium

Impact Readouts

Peak impact force

0 N

Energy transferred

0 J

Max bag swing

0.0°

Strikes thrown

How it works

Muay Thai is called the "art of eight limbs" because it scores strikes with fists, elbows, knees and shins. Each weapon delivers a different combination of effective striking mass and impact velocity, so the same fighter produces very different forces with a jab versus a shin kick. This sim models every strike as an impulsive collision with a heavy bag hanging as a pendulum:

Impulse:        J = m_eff · v_limb              (kg·m/s)
Peak force:      F = J / Δt                       (contact time Δt is weapon-specific)
Energy in:       E = ½ · m_eff · v_limb²           (Joules)
Angular impulse: ΔL = r × J   (r = bag radius arm from the pivot)
Pendulum swing:  θ'' = −(g/L)sinθ − b·θ'           (restoring gravity torque + chain damping)

Jab/Cross — light effective mass (~3 kg fist+forearm), high velocity (~8 m/s), very short contact (~8 ms) → sharp but modest force.
Round Kick — the shin/lower leg is the heaviest striking mass (~10 kg) at the highest velocity (~12 m/s) with a longer contact window (~20 ms) — Muay Thai's signature power strike.
Knee — mid-range mass (~8 kg) and velocity (~6 m/s), used at close range in the clinch.
Elbow — small mass (~4 kg) but extremely short contact time (~6 ms), so the force spikes sharply even though total energy is modest — this is why elbows cut skin rather than knock the bag far.

The impulse is applied as an angular kick to the bag's pendulum at the moment of contact, which then swings and decays under gravity and chain-friction damping — exactly like a real heavy bag.

Striking limb Heavy bag

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