To determine Minimum horse power must a motor have to be able to drag a 370 kg box along a level floor. Explanation Given: Mass of box = 370 kg Speed of box = 1.20 m/s μ = 0.45 Concept used: As per Newton’s second law of motion: ∑ F = m a Where, m is the mass and a is the acceleration. Power P = F → . V → = F V cos θ F : force v : velocity θ : Angle between force and velocity. P : power supply by force F Calculation: Consider free body diagram: F p : pulling force f : friction force N : normal force Mg : weight of box Apply Newton’s first law ( a = 0 ) N=mg F p = f = μ N = μ m g P = F V

Physics: Principles with Applications, Books a la Carte Edition & Modified Mastering Physics with Pearson eText -- ValuePack Access Card Package

1st Edition

ISBN: 9780321974990

Author: Douglas C. Giancoli

Publisher: PEARSON

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Chapter 6, Problem 70P

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Minimum horse power must a motor have to be able to drag a 370 kg box along a level floor.

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Physics: Principles with Applications, Books a la Carte Edition & Modified Mastering Physics with Pearson eText -- ValuePack Access Card Package

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