Pulleys and Levers Flashcards
7 cards from real Bennett Mechanical Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Pulleys and Levers flashcards as text
A single fixed pulley is used to raise a load. What is its main advantage?
Answer: It changes the direction of the applied force
A single fixed pulley provides no mechanical advantage but lets you pull down to lift up, changing force direction.
In a first-class lever, where is the fulcrum located?
Answer: Between the effort and the load
A first-class lever has the fulcrum positioned between the effort and the load, like a seesaw.
A load is 4 ft from the fulcrum and the effort is applied 12 ft from the fulcrum. What is the mechanical advantage?
Answer: 3
Mechanical advantage equals effort arm divided by load arm, so 12 ÷ 4 = 3.
A system of pulleys has 4 supporting rope segments lifting a load. What is the ideal mechanical advantage?
Answer: 4
The ideal mechanical advantage of a block and tackle equals the number of rope segments supporting the load.
Which type of lever has the load between the fulcrum and the effort?
Answer: Second-class lever
A second-class lever, like a wheelbarrow, has the load between the fulcrum and the effort.
To lift a 200 lb load with a mechanical advantage of 4, how much effort force is required (ignoring friction)?
Answer: 50 lb
Effort equals load divided by mechanical advantage, so 200 ÷ 4 = 50 lb.
When a movable pulley is used, what happens to the distance the rope must be pulled compared to the load's rise?
Answer: The rope is pulled twice as far
A movable pulley halves the force but requires pulling twice the length of rope as the load rises.