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Physics and Simple Machines Flashcards

7 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. A pulley system has a mechanical advantage of 4. If a 200 N load is lifted, how much effort force is required (ignoring friction)?

    Answer: 50 N

    Mechanical advantage = Load / Effort, so Effort = 200 N / 4 = 50 N.

  2. Which type of lever has the fulcrum located between the effort and the load?

    Answer: First-class lever

    In a first-class lever, the fulcrum is positioned between the effort force and the load.

  3. An inclined plane reduces the force needed to lift an object by increasing which quantity?

    Answer: The distance over which force is applied

    An inclined plane trades increased distance for reduced force, allowing the same work to be done with less effort.

  4. A wheel and axle has a wheel radius of 30 cm and an axle radius of 5 cm. What is its mechanical advantage?

    Answer: 6

    MA of a wheel and axle = wheel radius / axle radius = 30 / 5 = 6.

  5. Newton's Second Law states that force equals mass times acceleration. If a 10 kg object accelerates at 3 m/s², what net force acts on it?

    Answer: 30 N

    F = ma = 10 kg × 3 m/s² = 30 N.

  6. Which of the following best describes potential energy?

    Answer: Energy stored due to position or configuration

    Potential energy is stored energy based on an object's position or configuration, such as gravitational or elastic potential energy.

  7. A wedge is a modified version of which simple machine?

    Answer: Inclined plane

    A wedge is essentially two inclined planes joined back-to-back and converts a downward force into horizontal splitting forces.