Kinetic Energy: The Energy of Motion
Kinetic energy is the energy an object possesses due to its motion. Every moving object has kinetic energy. The faster an object moves or the more massive it is, the more kinetic energy it carries. Crucially, kinetic energy is proportional to the square of velocity — doubling speed quadruples kinetic energy. This has profound implications for vehicle safety.
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Formula
Kinetic Energy Calculator
Calculate the kinetic energy of any moving object from its mass and velocity.
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Worked Example
Given:
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FAQs
Why does velocity matter more than mass in kinetic energy?
Because velocity is squared. Doubling mass doubles KE, but doubling velocity quadruples it. A car at 100 km/h has four times the kinetic energy of the same car at 50 km/h. This is why speeding dramatically increases crash severity.
What happens to kinetic energy in a collision?
In an elastic collision KE is conserved. In an inelastic collision some KE converts to heat, sound, and deformation. Real collisions are always partly inelastic. Vehicle crumple zones are designed to absorb kinetic energy gradually, reducing peak force on occupants.
What is the relationship between kinetic and potential energy?
Kinetic and potential energy are interconvertible. A ball at the top of a ramp has maximum potential energy and zero kinetic energy. At the bottom it has maximum kinetic energy and zero potential energy. Total mechanical energy is conserved in the absence of friction.