Friction A force of 28.0 N is required to start a 3.4 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 28.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic friction? 4) A box is at rest on the floor when you begin pushing on it with a 40 N force. Let the mass be 20 kg, the coefficient of static friction be 0.18, and the coefficient of kinetic friction be 0.11. Does the box move? What is the acceleration? 5) A 250.0 kg crate is being pushed across the floor at a constant speed with a rope that makes an angle of 22.0 to the horizontal. If the force applied is equal to 875 N, what is the coefficient of kinetic friction? 875 N 22.0° 250.0 kg

Friction A force of 28.0 N is required to start a 3.4 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 28.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic friction? 4) A box is at rest on the floor when you begin pushing on it with a 40 N force. Let the mass be 20 kg, the coefficient of static friction be 0.18, and the coefficient of kinetic friction be 0.11. Does the box move? What is the acceleration? 5) A 250.0 kg crate is being pushed across the floor at a constant speed with a rope that makes an angle of 22.0 to the horizontal. If the force applied is equal to 875 N, what is the coefficient of kinetic friction? 875 N 22.0° 250.0 kg

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter5: Displacement And Force In Two Dimensions

Section5.3: Forces In Two Dimensions

Problem 39PP

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