1- Which one below describes spring constant the best? a. Measure the strongness of a spring b. Measure the stiffness of a pendulum c. Measure the strongness of a pendulum d. Measure the stiffness of a spring

The correct answer is d. Measure the stiffness of a spring.<br /><br />The spring constant, often denoted by the symbol k, is a measure of the stiffness of a spring. It quantifies the force required to compress or stretch the spring by a certain distance. The higher the spring constant, the stiffer the spring is. This concept is fundamental in Hooke's Law, which states that the force needed to extend or compress a spring is directly proportional to the distance it is stretched or compressed, with the spring constant as the proportionality constant.