Which two forms of mechanical energy are commonly discussed in introductory physics?

• A. $K$inetic energy and $U$otential energy
• B. Electrical energy and nuclear energy
• C. Thermal energy and chemical energy
• D. Sound energy and radiant energy

Answer: (A)

Verified step by step guidance

1. Understand that mechanical energy in physics typically refers to the energy associated with the motion and position of an object.
2. Recall that kinetic energy is the energy an object possesses due to its motion, given by the formula \(E_k = \frac{1}{2} m v^2\), where \(m\) is mass and \(v\) is velocity.
3. Recognize that potential energy is the energy stored due to an object's position or configuration, commonly gravitational potential energy given by \(U = m g h\), where \(m\) is mass, \(g\) is acceleration due to gravity, and \(h\) is height.
4. Note that other forms of energy like electrical, nuclear, thermal, chemical, sound, and radiant energy are not classified as mechanical energy because they involve different physical processes.
5. Conclude that the two forms of mechanical energy commonly discussed in introductory physics are kinetic energy and potential energy.