Kinetic energy

Definition

Kinetic energy is the energy possessed by an object due to its motion. It is calculated using the formula $KE = \frac{1}{2}mv^2$, where $m$ is mass and $v$ is velocity.

5 Must Know Facts For Your Next Test

1. Kinetic energy depends on both the mass and the velocity of an object.
2. The SI unit for kinetic energy is the Joule (J).
3. Doubling the velocity of an object will quadruple its kinetic energy.
4. Kinetic energy is a scalar quantity, meaning it has magnitude but no direction.
5. In a closed system, kinetic energy can be converted to other forms of energy but the total energy remains conserved.

Review Questions

• What factors determine the amount of kinetic energy an object has?
• How does changing the velocity of an object affect its kinetic energy?
• What is the formula for calculating kinetic energy?

Related terms

Potential Energy:

The stored energy in an object due to its position or state.

Work-Energy Theorem:

States that the work done on an object is equal to its change in kinetic energy.

Mechanical Energy:

The sum of kinetic and potential energies in a system.