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Physics and Simple Machines Questions and Answers Flashcards

6 cards from real SIFT 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. An object is accelerating at 3 m/s². If the net force on it is 15 N, what is its mass?

    Answer: 5 kg

    Using Newton's Second Law: F = ma, so m = F/a = 15/3 = 5 kg.

  2. What is the unit of power in the SI system?

    Answer: Watt

    The watt (W) is the SI unit of power, equal to one joule per second (J/s). Power measures the rate at which work is done or energy is transferred.

  3. An object at the top of a 50-meter cliff has potential energy of 4,900 J. What is its mass? (g = 9.8 m/s²)

    Answer: 10 kg

    PE = mgh, so m = PE/(gh) = 4,900/(9.8 × 50) = 4,900/490 = 10 kg.

  4. What is the mechanical advantage of a screw with a pitch of 0.5 cm and a handle radius of 10 cm? (MA = 2πr/p)

    Answer: ~125.7

    MA = 2πr/p = 2π(10)/0.5 = 20π/0.5 = 40π ≈ 125.7. The screw provides tremendous mechanical advantage by converting rotation into linear force.

  5. Two identical springs, each with spring constant k=100 N/m, are connected in parallel. What is the combined spring constant?

    Answer: 200 N/m

    Springs in parallel have their constants added: k_total = k₁ + k₂ = 100 + 100 = 200 N/m. They share the load, making the system stiffer.

  6. What is the velocity ratio of a block-and-tackle system with 4 rope segments supporting the load?

    Answer: 4

    The velocity ratio equals the number of rope segments supporting the movable pulley. With 4 segments, for every 4 feet of rope pulled, the load rises only 1 foot.