A system of two or more pulleys connected by ropes is known as what?

A system of two or more pulleys connected by ropes is referred to as a block and tackle. This configuration allows for the lifting of heavy loads with less effort due to the mechanical advantage that pulleys provide. In such a system, the ropes looped around the pulleys help to distribute the weight of the load, making it easier to lift. The arrangement of these pulleys can change depending on the number and direction of the ropes, thus affecting the total mechanical advantage achieved.

Understanding the mechanics of a block and tackle is crucial, especially in applications where heavy objects need to be hoisted or moved. This system contrasts with other mechanical systems mentioned in the options, such as a wheel and axle, inclined plane, or lever system, which serve different functions in mechanics and do not specifically involve multiple pulleys working together.