Work & Energy Calculator
Work Done (Joules)
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Work (kilocalories)
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Work (kWh)
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How to Calculate Work and Energy
Work is done when a force moves an object over a distance: W = Fd·cos(θ), where F is force in Newtons, d is distance in meters, and θ is the angle between force and displacement. When force is parallel to motion (θ = 0°), W = Fd. Work is measured in Joules (J).
The work-energy theorem states that net work equals the change in kinetic energy. One Joule is the work done by a 1 Newton force over 1 meter. This calculator also converts to kilocalories and kilowatt-hours for practical energy comparisons.
Understanding work and energy is fundamental to physics and engineering. It applies to lifting objects, mechanical systems, electrical energy consumption, and even biological processes like walking and running.
Frequently Asked Questions
What is work in physics?
Work = Force × Distance × cos(angle). It's the energy transferred when a force moves an object. Measured in Joules (J).
When is no work done?
No work is done when force is perpendicular to displacement (cos 90° = 0), when there is no displacement, or when there is no force.
What is a Joule?
One Joule is the work done by a force of 1 Newton moving an object 1 meter. It equals 1 watt-second of energy.
What is the work-energy theorem?
The net work done on an object equals its change in kinetic energy: W_net = ΔKE = ½mv² - ½mu².