Kinetic energy is motion energy. Any moving object—be it a car, a runner, or even a gust of wind—possesses kinetic energy, which varies with its mass and speed.
How to Calculate It
The most common equation is:
Kinetic Energy Formula: KE = ½ × m × v2
Where:
- m = mass (in kilograms)
- v = velocity (in meters per second)
- The standard unit is joules (J)
This formula shows kinetic energy increases with the square of speed: double the speed, get four times the energy.
Different Forms of Kinetic Energy
Kinetic energy is not solely motion in a straight line:
- Translational: movement from one point to another (e.g. cars, wind)
- Rotational: spinning motion around an axis (e.g. turbines, wheels)
- Vibrational: swift movement in tiny molecules or particles
- Thermal: random particle motion contributing to heat
- Electrical: movement of electrons in an electric current
Examples
- The kinetic energy of a parked car is zero; it increases as it moves.
- A football kicked at twice the speed will have four times more kinetic energy, because kinetic energy increases with the square of velocity.
FAQs
Q: Is kinetic energy always positive?
Yes—since speed is squared, kinetic energy is always positive and does not depend on direction.
Q: How is kinetic energy different from momentum?
Momentum and kinetic energy are related: Kinetic energy depends on the square of velocity, whereas momentum is mass × velocity. When an object undergoes work, its kinetic energy and momentum are changed.
References
The information in this article is based on insights from respected organizations in the energy field. We have reviewed content from the following sources to ensure accuracy and relevance:
Posted by Abu Talha
With a background in science at the A-level, Abu Talha has studied subjects including physics, chemistry, mathematics, and biology. Along with his more than 1.5 years of experience in digital marketing, he is passionate about writing about electric vehicles, sustainable energy, and how emerging technologies are influencing the future.
