answers 2025\2026 A+ Grade
Classes of Levers
- correct answer Class 1, Class 2, Class 3
Class 1 Levers
- correct answer Fulcrum is in the middle, with the effort (input) force on one side of the fulcrum and
resistance (output) on the other side.
Mechanical Advantage greater or less than 1
Ex: Seesaw, Crowbar, Pair of Scissors.
Class 2 Levers
- correct answer Resistance is in the middle, the effort is applied on one side of the resistance and the
fulcrum on the other side.
Mechanical Advantage always greater than 1
Ex: Wheelbarrow, nutcracker, bottle opener, or the brake pedal of a car.
Class 3 Levers
- correct answer Effort in the middle, the resistance is on one side of the effort and the fulcrum is
located on the other side.
Mechanical Advantage always less than 1
Ex: Pair of tweezers, human mandible
Lever Definitions
- correct answer Lever machine consisting of a beam or rigid rod pivoted at a fixed hinged, or fulcrum.
Input Force = Effort
Output Force = Load or Resistance