FCTC FCTC Test Pulleys, Gears, and Levers Questions and Answers 2

Question 1

A fixed pulley attached to the ceiling is used to lift a 200-lb load. Ignoring friction, how much force must be applied to the rope?

Accepted Answer

200 lb

Answer

A fixed pulley only changes the direction of force, so the effort required equals the load (200 lb).

Question 2

Two gears are meshed together. Gear A has 30 teeth and Gear B has 10 teeth. If Gear A rotates at 60 RPM, how fast does Gear B rotate?

Accepted Answer

180 RPM

Answer

Speed ratio is inversely proportional to tooth count: (30/10) × 60 = 180 RPM.

Question 3

Which class of lever has the effort between the fulcrum and the load?

Accepted Answer

Class 3

Answer

In a Class 3 lever, the effort is applied between the fulcrum and the load, as seen in tweezers or a fishing rod.

Question 4

A block-and-tackle system uses 4 rope segments supporting the load. What is the mechanical advantage?

Accepted Answer

4

Answer

In a block-and-tackle, mechanical advantage equals the number of rope segments supporting the movable block, which is 4.

Question 5

On a Class 1 lever, the fulcrum is positioned very close to the load. What is the effect on effort and distance?

Accepted Answer

Less effort, greater distance moved

Answer

When the fulcrum is near the load, the effort arm is long, so less force is needed, but the effort must move through a greater distance.

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