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Mechanical Comprehension Flashcards

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

Read the first 7 Mechanical Comprehension flashcards as text

  1. A spring with a constant of 200 N/m is compressed 0.05 m. How much potential energy is stored?

    Answer: 0.25 J

    Spring PE = ½kx² = ½ × 200 × (0.05)² = ½ × 200 × 0.0025 = 0.25 J.

  2. Water flows through a pipe that narrows from a 4-inch diameter to a 2-inch diameter. What happens to the water's velocity?

    Answer: It quadruples

    Area decreases by a factor of 4 (radius halved → area quartered), so by continuity, velocity increases fourfold.

  3. A lever has its fulcrum at one end. A 100-lb load sits 3 ft from the fulcrum. How much force is needed 9 ft from the fulcrum to balance it?

    Answer: 33 lbs

    Torque balance: 100 × 3 = F × 9, so F = 300/9 ≈ 33 lbs.

  4. What best describes the mechanical advantage of a single fixed pulley?

    Answer: MA = 1

    A single fixed pulley changes direction of force but provides no mechanical advantage, so MA = 1.

  5. A gear train has a driver gear with 10 teeth and a driven gear with 40 teeth. If the driver spins at 200 RPM, how fast does the driven gear spin?

    Answer: 50 RPM

    Speed ratio = driver teeth / driven teeth = 10/40 = 1/4, so driven speed = 200 × (1/4) = 50 RPM.

  6. An inclined plane 10 ft long rises 2 ft. What is the ideal mechanical advantage?

    Answer: 5

    IMA of an inclined plane = length of slope / height = 10/2 = 5.

  7. Which material property allows a metal rod to return to its original shape after bending forces are removed?

    Answer: Elasticity

    Elasticity is the ability of a material to return to its original shape after deformation forces are removed.