## What is Kinetic energy?

In physics, the *kinetic energy* (KE) of an object is the *energy* that it has due to its motion. It is *defined* as the work needed for an object of a known mass to accelerate to a given velocity. This *energy* the object gains during its acceleration, will be maintained unless its speed changes.

## Kinetic energy equation

To calculate Kinetic energy we write the equation like this.

$E_k = { 1 \over2} mv {^2}$

## Kinetic energy demo

In this tutorial you will learn how to calculate the energy stored in a moving object.

## Chilled practice question

Calculate to the nearest Joule the Kinetic energy store in a car with a mass of 850 Kg which is moving at a velocity of 3.5 m/s

## Frozen practice question

A meteorite has 8000 J of Kinetic energy, calculate its mass if it is moving with a velocity of 20 m/s

## Science in context

Anything that is moving has energy in its kinetic energy store

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