# How do you calculate the potential energy of a .1 kg bird sitting on a tree limb 5 meters off the ground?

Dec 1, 2015

The gravitational potential energy of the bird is 5 Joules.

#### Explanation:

Gravitational potential energy, $\text{PE"_"grav}$, is the energy stored in an object due to its vertical position or height.

$\text{PE"_"grav"=mxxgxxh}$, where $m$ is mass in kg; $g$ is acceleration due to gravity, $\text{9.1 m/s"^2}$; and $h$ is height in meters.

Gravitational Potential Energy of the Bird

$\text{PE"_"grav"=(0.1"kg") xx (9.8"m/s"^2) xx (5"m")="5 N·m"="5 Joules}$ (rounded to one significant figure)