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OAR Mechanical Comprehension: Forces Questions and Answers Flashcards

6 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 1,200 kg car accelerates from rest at 3 m/s². What net force is required to produce this acceleration?

    Answer: 3,600 N

    Using Newton's Second Law, F = ma = 1,200 × 3 = 3,600 N.

  2. Three coplanar forces of 5 N, 3 N, and 7 N all act to the right on an object. What is the resultant force?

    Answer: 15 N to the right

    When forces act in the same direction, the resultant is their sum: 5 + 3 + 7 = 15 N to the right.

  3. A 20 kg crate requires 60 N of horizontal force to start sliding on a surface. What is the coefficient of static friction? (g = 10 m/s²)

    Answer: 0.3

    μs = F / (mg) = 60 / (20 × 10) = 60 / 200 = 0.3.

  4. A 15 kg object is in free fall near Earth's surface. Ignoring air resistance, what is the net force on the object? (g = 9.8 m/s²)

    Answer: 147 N downward

    The only force is gravity: F = mg = 15 × 9.8 = 147 N downward.

  5. Two ropes support a 100 N weight. If the ropes make equal angles and each rope carries an equal share, what is the vertical component of tension in each rope?

    Answer: 50 N

    Since the system is in equilibrium and the ropes share equally, each rope's vertical tension component is 100 / 2 = 50 N.

  6. A force of 40 N is applied to a 10 kg block on a frictionless surface. After 5 seconds, what is the block's velocity if it starts from rest?

    Answer: 20 m/s

    Acceleration a = F/m = 40/10 = 4 m/s², so v = at = 4 × 5 = 20 m/s.