Kinetic Energy

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5.2Kinetic Energy

In these revision notes for Kinetic Energy, we cover the following key points:

  • What is Kinetic Energy?
  • What are the factors affecting the Kinetic Energy of an object?
  • What is the relationship between Work and the change in Kinetic Energy of an object?
  • How to calculate the Kinetic Energy of moving objects?

Kinetic Energy Revision Notes

Kinetic Energy is the energy of a moving object. This means when an object is at rest it does not possess Kinetic Energy.

Kinetic Energy is denoted in equations as KE. As all the other types of energy, it is also measured in Joules [J].

Kinetic Energy of a moving object depends on two factors:

  1. The Mass m of object, and
  2. The Velocity v of the object.

The equation that relates Kinetic Energy with the abovementioned factors is

KE = 1/2 m × v2

The Work-Kinetic Energy Theorem, states that

"The work done by the sum of all forces acting on an object equals the change in the kinetic energy of the object itself."

Mathematically, the Work-Kinetic Energy Theorem is written as:

F × ∆x = 1/2 m × v2f - 1/2 m × v2i

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