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A baggage conveyor is used to unload luggage from an airplane. The 10 -kg duffel bag $A$ is sitting on top of the 20 -kg suitcase $B$. The conveyor is moving the bags down at a constant speed of $0.5 \mathrm{m} / \mathrm{s}$ when the belt suddenly stops. Knowing that the coefficient of friction between the belt and $B$ is 0.3 and that bag $A$ does not slip on suitcase $B,$ determine the smallest allowable coefficient of static friction between the bags.

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$\mu>0.824$

Physics 101 Mechanics

Chapter 12

Kinetics of Particles: Newton’s Second Law

Newton's Laws of Motion

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Lectures

03:28

Newton's Laws of Motion are three physical laws that, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces. These three laws have been expressed in several ways, over nearly three centuries, and can be summarised as follows: In his 1687 "Philosophiæ Naturalis Principia Mathematica" ("Mathematical Principles of Natural Philosophy"), Isaac Newton set out three laws of motion. The first law defines the force F, the second law defines the mass m, and the third law defines the acceleration a. The first law states that if the net force acting upon a body is zero, its velocity will not change; the second law states that the acceleration of a body is proportional to the net force acting upon it, and the third law states that for every action there is an equal and opposite reaction.

09:37

Isaac Newton (4 January 1643 – 31 March 1727) was an English mathematician, physicist, astronomer, theologian, and author (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and a key figure in the scientific revolution. His book Philosophiæ Naturalis Principia Mathematica ("Mathematical Principles of Natural Philosophy"), first published in 1687, laid the foundations of classical mechanics. Newton also made seminal contributions to optics, and he shares credit with Gottfried Wilhelm Leibniz for developing the infinitesimal calculus.

05:38

A baggage conveyor is used…

04:20

02:15

Baggage on the floor of th…

02:57

11:18

15:10

At the airport, you pull a…

02:04

A suitcase is gently dropp…

03:57

01:29

A passenger is travelling …

04:12

A conveyer belt is used to…

09:15

A suitcase of weight $M g=…

13:36

02:32

Starting from rest, a $10.…

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