# Introduction to work and energy | Work and energy | Physics | Khan Academy | Summary and Q&A

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February 17, 2008
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Introduction to work and energy | Work and energy | Physics | Khan Academy

## TL;DR

Work is defined as energy transferred by a force, and energy is the ability to do work. Kinetic energy is the energy due to motion and can be calculated using the formula 1/2 mv^2.

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### Q: What is the definition of work in physics?

In physics, work is defined as energy transferred by a force. It can be calculated using the formula work = force x distance.

### Q: How is energy defined in physics?

Energy is defined as the ability to do work. It is related to both force and work, as work is the transfer of energy by a force.

### Q: How is kinetic energy calculated?

Kinetic energy can be calculated using the formula 1/2 mv^2, where m is the mass of the object and v is its velocity. It represents the energy due to an object's motion.

### Q: What is the relationship between work and energy?

Work and energy are closely related concepts. Work is the transfer of energy by a force, and energy is the ability to do work. They can be used to describe and quantify different forms of physical phenomena.

## Summary & Key Takeaways

• Work is energy transferred by a force and can be calculated using the formula work = force x distance.

• Energy is the ability to do work and is related to both force and work. It can be defined as the ability to transfer work to an object.

• Kinetic energy is the energy due to motion and can be calculated using the formula 1/2 mv^2.