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Forces, Torque, and Motion Flashcards

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

Read the first 7 Forces, Torque, and Motion flashcards as text

  1. An elevator rope stretches 0.02 m under a load of 4,000 N. If the spring constant of the rope is k, what is k?

    Answer: 200,000 N/m

    k = F / x = 4,000 / 0.02 = 200,000 N/m.

  2. An elevator car travels 30 m upward in 15 seconds at constant speed. What is its velocity?

    Answer: 2 m/s

    Velocity = distance / time = 30 / 15 = 2 m/s.

  3. A 750 kg car is supported by a rope with 2:1 roping. What tension acts in each rope segment supporting the car?

    Answer: 3,675 N

    With 2:1 roping, the car weight (750 × 9.8 = 7,350 N) is split across 2 rope segments: 7,350 / 2 = 3,675 N each.

  4. Which of the following increases the torque applied to a bolt without changing the applied force?

    Answer: Using a longer wrench

    Torque = Force × lever arm; a longer wrench increases the lever arm, increasing torque for the same force.

  5. A force of 200 N acts on an object at a 30° angle to the horizontal. What is the horizontal component of this force?

    Answer: 173 N

    Horizontal component = 200 × cos 30° = 200 × 0.866 ≈ 173 N.

  6. What happens to the tension in a hoisting rope when the elevator decelerates while moving upward?

    Answer: Tension decreases below the static load

    Decelerating while moving upward means net acceleration is downward, reducing the rope tension below the car's static weight.

  7. A flywheel stores energy primarily as:

    Answer: Rotational kinetic energy

    A flywheel stores energy in its spinning mass as rotational kinetic energy (½Iω²).