The Flash — Speed Force
Real physics: from walking to 8.44× the speed of light. KE, drag, heat, and time dilation — all live.
Current Speed
301.1 m/s
NEAR-SUPERSONIC
1.00e-4% of c
Kinetic Energy
3.63 MJ
KE = ½mv²
Air Drag Force
8.33 kN
Fd = ½ρCdAv²
Leading-edge Temp
59.4 °C
Subsonic
Lorentz Factor γ
1.000000
Time dilation: t' = t/γ
Physics Breakdown
KE = ½ × m × v²
Flash weighs 80 kg. At this speed his kinetic energy is:
3.63 MJ
0.87 kcal of heat
½ × 80 kg × (301.1 m/s)² = 3.63 MJ
Physics note
At relativistic speeds the classical formula underestimates KE. Correct relativistic KE = (γ−1)m₀c² = 3.63 MJ. (Negligible difference at this speed.)
Speed Timeline (Logarithmic — scroll right)
Treadmill Challenge
At 301.1 m/s, what can Flash accomplish?
Distance in 1 second
301 m
0.0008% of Earth's circumference
Time to circle the Earth
1.54 days
40,075 km circumference
Time to reach the Moon
14.78 days
384,400 km away
Relativistic mass
80.00 kg
γ = 1.0000 (rest: 80 kg)
Time dilation factor (γ)
1.000000
Negligible at this speed
Time to Mars (avg 225 Mkm)
8648.62 days
225,000,000 km average distance
Formula Reference
Kinetic Energy
KE = ½mv²
Classical (non-relativistic)
Air Drag Force
Fd = ½ρCdAv²
ρ=1.225 kg/m³, Cd=0.3, A=0.5 m²
Stagnation Temp
T★ = T₀(1 + 0.2M²)
Isentropic, γ=1.4 for air
Time Dilation
t′ = t / γ
γ = 1/√(1 − v²/c²)
⚡ SciFunLab · The Flash Speed Force Simulation · All physics values computed client-side in real time