Final answer:
A dynamometer is an apparatus used for measuring force or energy, often utilized in physics education to empirically verify principles like torque and mechanical advantage.
Step-by-step explanation:
An apparatus for measuring force or energy is known as a dynamometer. This device can be used to measure the force exerted by a stretched spring, for example, providing a direct and reproducible measure of force. In educational settings, such as an AP Physics class, understanding the dynamics of forces and energy is key, and using a dynamometer allows for empirical verification of theoretical concepts like torque and mechanical advantage. For instance, when a force is applied to a spring, causing it to extend, a dynamometer attached to the spring could measure the resulting force, often calibrated in units such as newtons.