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FCTC Written Study Guide Exam Questions with Complete Solutions
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FCTC Written Study Guide ExamQuestions with Complete Solutions
Be mindful of questions with absolutes. What are some absolutes and why
watch out for them? - -Examples of absolutes are "absolutely, always,
forever, completely, infinite, never, only, sole, undeniable, or wholly".
Absolutes or any sort of broad statements should be suspected as wrong.
-Belt and Pulley Systems - -Two or more pulleys in common to a belt. If the
pulleys are of differing pitch diameters, a mechanical advantage is realized.
Doesn't depend on ratio of teeth as with gears and sprockets, only pitch
diameter.
-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
-Classes of Levers - -Class 1, Class 2, Class 3
-For a Rope and Pulley System that is a Block and Tackle, is characterized
by: - -* If rope does not dissipate or store energy, then it's mechanical
advantage is the number of parts of the rope that act on the load.
- if the anchor knot is at the load ("A", "D", and "E") then mechanical
advantage will be odd.
(1:1, 3:1, 5:1, etc.)
- if the anchor knot is at the anchor ("B", "C") then mechanical advantage will
be even. (2:1, 4:1, 6:1, etc.)
- to calculate haul distance, multiply the distance need to go by the
mechanical advantage. (3:1 ratio, 20 ft to haul, multiply 3 x 20 ft to get total
of 60ft)
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