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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.

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  1. A lever balances when the torque on each side is equal. If a 60 N load sits 2 m from the fulcrum, what effort is needed 4 m from the fulcrum?

    Answer: 30 N

    Torque balance: effort × 4 = 60 × 2, so effort = 120/4 = 30 N.

  2. Which of the following is NOT a simple machine?

    Answer: Spring

    The six simple machines are lever, wheel and axle, pulley, inclined plane, wedge, and screw — a spring is not one of them.

  3. A block and tackle system with 3 movable pulleys and 3 fixed pulleys has approximately what mechanical advantage?

    Answer: 6

    A block and tackle with 3 movable pulleys provides a mechanical advantage of 6 (twice the number of movable pulleys).

  4. When you tighten a jar lid using your fingers, the lid acts as which component of a wheel and axle?

    Answer: The axle

    The jar lid is the axle (smaller radius); your hand gripping the outside acts as the wheel (larger radius) applying torque.

  5. An inclined plane has a mechanical advantage of 5. If the load weighs 300 N, how much effort force is required (ignoring friction)?

    Answer: 60 N

    Effort = load / MA = 300 / 5 = 60 N.

  6. Which of the following best describes the trade-off when using any simple machine?

    Answer: You gain force but must apply it over a greater distance

    Simple machines conserve energy; gaining mechanical advantage (more force) always requires moving through a greater distance.

  7. A doorknob is an example of which simple machine?

    Answer: Wheel and axle

    A doorknob is a wheel and axle — the knob is the wheel (large radius) and the spindle is the axle (small radius).