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OAR Mechanical Comprehension: Forces Flashcards

7 cards from real OAR 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 10 kg box is pushed across a frictionless surface with a net force of 30 N. What is the box's acceleration?

    Answer: 3 m/s²

    Newton's second law: a = F/m = 30/10 = 3 m/s².

  2. Two forces act on an object: 15 N to the right and 9 N to the left. What is the magnitude and direction of the net force?

    Answer: 6 N to the right

    Net force = 15 − 9 = 6 N in the direction of the larger force (right).

  3. Which of the following best describes a force couple?

    Answer: Two equal and opposite forces that produce rotation

    A couple consists of two equal, opposite, non-collinear forces that produce pure rotation (torque) with no net linear force.

  4. An object is in static equilibrium. Which statement must be true?

    Answer: The net force and net torque on it are both zero

    Static equilibrium requires both the sum of all forces and the sum of all torques to equal zero.

  5. A 500 N person stands on a scale in an elevator accelerating upward at 2 m/s². What does the scale read? (g ≈ 10 m/s²)

    Answer: 600 N

    Mass = 50 kg; scale reads N = m(g + a) = 50(10 + 2) = 600 N.

  6. If the coefficient of static friction between a box and a floor is 0.4 and the box weighs 200 N, what is the maximum static friction force?

    Answer: 80 N

    Maximum static friction = μs × Normal force = 0.4 × 200 = 80 N.

  7. A block rests on a ramp inclined at 30°. Which component of gravity acts parallel to the ramp surface?

    Answer: mg sin 30°

    The component of gravity parallel to the incline equals mg sin θ, which drives the block down the slope.