Final answer:
The fulcrum in a photo of a lever setup is typically a pivot or support point, which could be represented by a wooden cube and clay. Spring scales can be used with a fulcrum to weigh an object heavier than the scale's capacity. Measurements for determining angular momentum include the mass of the rock, lever length, and applied force.
Step-by-step explanation:
The part labeled as the fulcrum in a photo of a lever setup would typically be a pivot or support point upon which the lever rotates. This could be a wooden cube and clay used to balance a ruler, which acts as the lever, especially in a classroom or home experiment setting. In more complex lever systems, the fulcrum might be a dedicated mechanical part designed to support the lever.
Spring scales, meanwhile, could be used in conjunction with a simple fulcrum to weigh an object that's heavier than the scale's maximum capacity. By strategically placing the fulcrum and using principles of leverage, a smaller force measured by the spring scale could balance the heavier weight, allowing for indirect measurement.
For a lever placed on a fulcrum with a rock on one end and an applied force on the other, the measurements needed to determine the system's angular momentum would include the mass of the rock, the length of the lever on both sides of the fulcrum, and the force applied. These can help calculate moments which are crucial for determining angular momentum.