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OAR Mechanical Comprehension: Simple Machines Flashcards

7 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 7 OAR Mechanical Comprehension: Simple Machines flashcards as text

  1. A compound pulley system has 4 rope segments supporting the load. What is the mechanical advantage?

    Answer: 4

    In a compound pulley, the mechanical advantage equals the number of rope segments supporting the load.

  2. A third-class lever has the effort applied between the fulcrum and the load. What is a real-world example?

    Answer: Fishing rod

    A fishing rod is a third-class lever where the effort (hand) is between the fulcrum (grip end) and the load (fish).

  3. If a lever arm on the effort side is 4 times longer than the resistance side, the lever provides a mechanical advantage of:

    Answer: 4

    Mechanical advantage = effort arm length / resistance arm length = 4/1 = 4.

  4. Which simple machine is essentially a circular inclined plane wrapped around a cylinder?

    Answer: Screw

    A screw is an inclined plane (ramp) wrapped helically around a cylinder.

  5. A movable pulley is attached to a load. Compared to no pulley, lifting the load requires:

    Answer: Half the force over twice the distance

    A movable pulley halves the required force but requires pulling the rope twice the distance the load travels.

  6. An axe blade is a type of which simple machine?

    Answer: Wedge

    An axe blade is a wedge — a double inclined plane that converts downward force into splitting force.

  7. A bolt and nut system works because the nut acts as which simple machine?

    Answer: A screw

    The nut traveling along the bolt threads is a screw mechanism converting rotational motion into linear clamping force.