FCTC FCTC Test Pulleys, Gears, and Levers Questions and Answers 2 — Questions and Answers
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?
- 100 lb
- 150 lb
- 200 lb (Correct answer)
- 400 lb
Correct answer: 200 lb
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?
- 20 RPM
- 60 RPM
- 180 RPM (Correct answer)
- 120 RPM
Correct answer: 180 RPM
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?
- Class 1
- Class 2
- Class 3 (Correct answer)
- Class 4
Correct answer: Class 3
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?
- 2
- 4 (Correct answer)
- 8
- 1
Correct answer: 4
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?
- Less effort, shorter distance moved
- More effort, greater distance moved
- Less effort, greater distance moved (Correct answer)
- More effort, shorter distance moved
Correct answer: Less effort, greater distance moved
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.
Question 6: A wheel-and-axle is a simple machine related to which other simple machine?
- Pulley
- Wedge
- Lever (Correct answer)
- Inclined plane
Correct answer: Lever
A wheel-and-axle is essentially a rotating lever, where the wheel acts as the effort arm and the axle acts as the resistance arm.
FCTC FCTC Test Pulleys, Gears, and Levers Questions and Answers 2
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?