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Question 30243
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Laws of Motion and Friction: String Over Pulley — Friction MCQ

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String Over Pulley — FrictionHardQuestion 30243

Question

A 6 kg block on a rough horizontal surface (μₖ = 0.3) is connected by a string over a pulley to a 4 kg hanging mass. The acceleration is: (g = 10 m/s²)
  1. A
    2.2 m/s²
    Correct
  2. B
    2.5 m/s²
  3. C
    1.8 m/s²
  4. D
    2 m/s²

Correct answer

2.2 m/s²

Explanation

The driving force is 4×10−0.3×6×10=224×10-0.3×6×10=22 N and the total mass is 10 kg. Therefore a=22/10=<strong>2.2 m/s2</strong>a=22/10=<strong>2.2\text{ m/s}^2</strong>.

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