First Definition for Kinetic Energy
When something is in motion it is said to have kinetic energy.
Formula for Kinetic Energy
For an object that is moving the kinetic energy equals one half times the mass of the object times the square of the speed of the object. In symbols:
EK = (1/2)mv2
Example Calculation for Kinetic Energy
How much kinetic energy does an object have if its mass is 5.0 kg and it is moving at a speed of 4.0 m/s?
|EK= (1/2)mv2||Formula for kinetic energy.|
|EK= (1/2)(5.0 kg)(4.0 m/s)2||Plug in values for mass and speed.|
|EK= 40 J||Kinetic Energy equals 40 J.|
Here are some problems to try using the above equation: