Kinetic Energy Calculator
Kinetic energy is the energy an object possesses due to its motion. Defined by the equation KE = ½mv², it depends on both the mass and the square of the velocity of the moving object. This means doubling the speed quadruples the kinetic energy, which is why high-speed collisions are so much more destructive than low-speed ones.
The kinetic energy formula KE = ½mv² is derived from the work-energy theorem. It tells us the amount of work needed to accelerate an object from rest to a given velocity, or equivalently, the work the object can do while decelerating to a stop.
- KE is measured in Joules (J), where 1 J = 1 kg·m²/s²
- m is the mass of the object in kilograms
- v is the speed of the object in meters per second
Examples: A 0.145 kg baseball thrown at 40 m/s has a kinetic energy of about 116 J. A 1,200 kg car traveling at 27 m/s (about 60 mph) carries approximately 437,400 J (437.4 kJ) of kinetic energy.
The quadratic dependence on velocity is critically important in safety engineering, vehicle design, and ballistics. It also explains why braking distance increases with the square of speed.