Match each mechanical device or system to its correct lever classification and corresponding mechanical advantage (MA) characteristics.
- A hydraulic excavator arm lifting dirt, where the cylinder pushes upward on the boom at a point between the main base hinge and the loaded bucket.Third-Class Lever; multiplies distance and speed at the expense of requiring greater effort force.
- A hinged nutcracker being squeezed, where the hard walnut is positioned between the hinge joint and the user's squeezing hands.Second-Class Lever; multiplies effort force but requires the effort to move through a greater distance.
- A steel pry bar lifting a heavy concrete slab, where a small block of wood acts as a pivot point placed very close to the concrete slab.First-Class Lever configured to multiply effort force; the effort arm is strictly longer than the load arm.
- A trebuchet siege engine launching a projectile, where a massive counterweight applies downward force on a short arm to pivot a much longer throwing arm.First-Class Lever configured to multiply speed and distance; the load arm is strictly longer than the effort arm.
Answer
The correct matches pair each mechanical system with its corresponding lever classification based on the sequence of Effort, Fulcrum, and Load.
Each system perfectly aligns with the fundamental definitions of the three lever classes based on the relative positions of the fulcrum, effort, and load. Class 1 has the fulcrum in the middle, Class 2 has the load in the middle, and Class 3 has the effort in the middle.
Step-by-Step Solution
Key Concept
Identifying Lever Classes and Mechanical Advantage
Estimated Time:2m 0s