Potential Energy Calculator
Gravitational Potential Energy (U)
What is Gravitational Potential Energy?
Potential energy is the stored energy an object possesses because of its position relative to other objects, stresses within itself, its electric charge, or other factors. The most common form used in physics classrooms is Gravitational Potential Energy (GPE). This is the energy held by an object when it is at a vertical height above a reference point (usually the ground).
Conceptually, it represents the work done against gravity to lift an object to a certain height. The higher an object is, or the more mass it has, the more potential energy it stores. When the object falls, this potential energy is converted into kinetic energy.
How to Calculate Potential Energy: The Formula
To find the potential energy of an object, you use a simple linear formula:
PE = m × g × h
- m (Mass): The weight of the object in kilograms (kg).
- g (Gravity): The acceleration due to gravity. On Earth, this constant is approximately 9.81 m/s².
- h (Height): The vertical distance in meters (m) from the reference point.
How to Use This Calculator
Using our online Potential Energy Calculator is straightforward. Follow these steps:
- Input the Mass: Enter the mass of your object in kilograms. If you have grams, divide by 1,000 first.
- Check Gravity: The default value is set to Earth's gravity (9.81). You can change this if you are calculating for Mars (3.71) or the Moon (1.62).
- Enter Height: Input the vertical height the object has reached.
- Hit Calculate: The result will be displayed instantly in Joules (J).
Frequently Asked Questions
Q: What unit is potential energy measured in?
A: In the International System of Units (SI), energy is measured in Joules (J). One Joule is equal to one kilogram-meter squared per second squared.
Q: Can potential energy be negative?
A: Yes, potential energy can be negative depending on your reference point (the "zero level"). For example, if you define the ground as zero and an object is in a hole, its height is negative, resulting in negative PE.
Q: Is potential energy different from kinetic energy?
A: Yes. Potential energy is "stored" energy based on position, while kinetic energy is the energy of motion. In a swinging pendulum, energy constantly converts between these two forms.