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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.

Read the first 7 Physics and Simple Machines flashcards as text

  1. A lever has an effort arm of 3 m and a load arm of 0.5 m. What is its mechanical advantage?

    Answer: 6

    MA = effort arm / load arm = 3 m / 0.5 m = 6, meaning the lever multiplies the effort force by 6.

  2. Which of the following is an example of a second-class lever?

    Answer: Wheelbarrow

    In a wheelbarrow, the wheel (fulcrum) is at one end, the load is in the middle, and effort is at the other end — a second-class lever.

  3. Velocity differs from speed in that velocity also specifies:

    Answer: Direction

    Velocity is a vector quantity that includes both magnitude (speed) and direction, while speed is a scalar with magnitude only.

  4. A 5 kg object is lifted 3 meters. How much gravitational potential energy does it gain? (g = 10 m/s²)

    Answer: 150 J

    PE = mgh = 5 kg × 10 m/s² × 3 m = 150 J.

  5. The mechanical advantage of a fixed pulley is:

    Answer: 1

    A fixed pulley only changes the direction of the applied force; it does not multiply force, so its MA = 1.

  6. If you double the mass of an object while keeping acceleration constant, the required force:

    Answer: Doubles

    From F = ma, doubling mass while holding acceleration constant requires doubling the force.

  7. An inclined plane has a height of 2 m and a length of 8 m. What is its mechanical advantage?

    Answer: 4

    MA of an inclined plane = length / height = 8 m / 2 m = 4, meaning it takes one-fourth the force to push something up the ramp versus lifting it straight up.