Can kinetic energy be negative? explain why or why not.

Question:

Can kinetic energy be negative? explain why or why not.

Kinetic Energy

{eq}\\ {/eq}

The energy possessed by an object by the virtue of motion is called the kinetic energy of the object. It is the energy required to accelerate the object from the state of rest to its current velocity. The two parameters on which the kinetic energy of the object depends are:

  • The mass of the object
  • The velocity of the object.

Answer and Explanation:

{eq}\\ {/eq}

The kinetic energy of an object is given by the equation:

{eq}K=\dfrac{1}{2}mv^2 {/eq}

Here,

  • {eq}m {/eq} is the mass of the object.
  • {eq}v {/eq} is the velocity of the object.


In the above expression, the first term {eq}\; (m) {/eq} is always positive. The second therm, {eq}\;(v^2) {/eq}, is also positive since the square of a scalar is always positive.

Therefore, the kinetic energy of the object is always positive by definition.



Learn more about this topic:

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Kinetic Energy: Examples & Definition

from General Studies Science: Help & Review

Chapter 4 / Lesson 14
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