FCTC Test Pulleys, Gears, and Levers Questions and Answers 3

Question 1

A compound pulley system uses 4 rope segments supporting a load. If the load weighs 400 lbs, how much force must be applied to lift it (ignoring friction)?

Accepted Answer

100 lbs

Answer

With 4 supporting rope segments, the mechanical advantage is 4, so the effort needed is 400 ÷ 4 = 100 lbs.

Question 2

Two gears are meshed together. Gear A has 30 teeth and Gear B has 10 teeth. If Gear A makes 2 full rotations, how many rotations does Gear B complete?

Accepted Answer

6

Answer

The gear ratio is 30:10 = 3:1, so Gear B rotates 3 times for every rotation of Gear A, giving 2 × 3 = 6 rotations.

Question 3

A firefighter uses a third-class lever to swing a pick-head axe. Where is the effort force applied on a third-class lever?

Accepted Answer

Between the fulcrum and the load

Answer

In a third-class lever, the effort is applied between the fulcrum and the load, trading mechanical advantage for speed and range of motion.

Question 4

A fixed pulley changes the direction of the rope. What is its mechanical advantage?

Accepted Answer

1

Answer

A single fixed pulley has a mechanical advantage of 1; it only redirects the force, not multiplying it.

Question 5

Gear X rotates clockwise and is meshed directly with Gear Y. In which direction does Gear Y rotate?

Accepted Answer

Counterclockwise

Answer

When two gears are meshed directly, they rotate in opposite directions; if X is clockwise, Y is counterclockwise.

FCTC Test Practice Test

FCTC Test Practice Test

FCTC Test Pulleys, Gears, and Levers Questions and Answers 3