FCTC WRITTEN ACTUAL EXAM QUESTIONS AND CORRECT VERIFIED ANSWERS|ALREADY GRADED A

FCTC WRITTEN ACTUAL EXAM QUESTIONS AND CORRECT VERIFIED
ANSWERS|ALREADY GRADED A

Classes of Levers - Class 1, Class 2, Class 3



Class 1 Levers - 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 - 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 - 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 - Lever machine consisting of a beam or rigid rod pivoted at a fixed hinged, or
fulcrum.
Input Force = Effort

Output Force = Load or Resistance


What does "fre, 123" mean? - Fulcrum is in the middle for Class 1 Levers

Resistance (output) in middle for Class 2

Effort (input) in the middle for Class 3



Formula for Determining the head pressure difference between an intake and output - 1 vertical
foot = 0.433 psi