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OAR Mechanical Comprehension: Simple Machines Questions and Answers Flashcards

6 cards from real OAR practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 OAR Mechanical Comprehension: Simple Machines Questions and Answers flashcards as text

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

    Answer: Third class

    In a third-class lever, the effort is applied between the fulcrum and the load, which increases speed and range of motion at the cost of force.

  2. A mechanic uses a 12-inch wrench to turn a bolt with an effective radius of 0.5 inches. What is the ideal mechanical advantage?

    Answer: 24

    The wrench acts as a wheel and axle, so mechanical advantage = effort radius / load radius = 12/0.5 = 24.

  3. An inclined plane reduces the force needed to raise an object by increasing which of the following?

    Answer: The distance over which the force is applied

    An inclined plane trades increased distance for reduced force, keeping the total work the same.

  4. A fixed pulley is attached to the ceiling to lift a load. What is the primary advantage of this single fixed pulley?

    Answer: It changes the direction of the applied force

    A single fixed pulley provides a mechanical advantage of only 1 but allows the user to pull downward instead of lifting upward.

  5. A knife blade is an example of which simple machine?

    Answer: Wedge

    A knife blade is a wedge that converts the downward cutting force into two forces that push the material apart.

  6. If a screw with a pitch of 0.25 inches is turned using a screwdriver with a handle circumference of 4 inches, what is the ideal mechanical advantage?

    Answer: 16

    The mechanical advantage of a screw equals the circumference of the turning force divided by the pitch: 4/0.25 = 16.