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PHYS 1501Q Lecture Notes - Lecture 13: Friction, International System Of Units

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Verified Note
coralcat765
24 Sep 2018
School
UConn
Department
Physics
Course
PHYS 1501Q
Professor
Soroush Khosravi Dehaghi, Robert McCutcheon

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PHYS 1501Q Lecture Notes - Lecture 13: Friction, International System Of Units

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Document Summary

Physics 1501q - lecture 13 - friction 9/24/18. Key (in si units): t = time (s) x = distance (m) v = velocity (m/s) a = acceleration (m/s 2 ) = change in g = gravity = 9. 81 m/s 2 m = mass (kg) The friction force has a direction in opposition to the relative motion of the surfaces. The cause of friction is the roughness of the surfaces in contact with each other. Friction depends only on the properties of each surface. The magnitude of the friction force is proportional to the magnitude of the normal force. Where f k is the force of kinetic friction, k is the coefficient of kinetic friction, and n is the normal force. Object not moving relative to the surface f s . F s must be determined by newton"s 2nd law if f s . Box sliding on a horizontal table with initial velocity and friction:

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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Related Questions

A block of mass m rests against a spring with a spring constant of k on a rough inclined plane which makes an angle of θ degrees with the horizontal. The block compresses the spring a distance d from its neutral position, and friction is preventing the block from moving up the ramp. Use Fsp as the spring force, Fs for the force of static friction, and Fk as the force of kinetic friction. Set your coordinates to have the x-axis along the surface of the plane, with up the plane as positive, and the y-axis normal to the plane, without as positive. Denoting the coefficient of static friction by us, Write an expression for the sum of the forces in the x-direction just before the block begins to slide up the inclined plane. Use defined quantities and g in your expression.

A block of mass m rests against a spring with a spring constant of k on a rough inclined plane which makes an angle of θ degrees with the horizontal. The block compresses the spring a distance d from its neutral position, and friction is preventing the block from moving up the ramp. Use Fsp as the spring force, Fs for the force of static friction, and Fk as the force of kinetic friction. Set your coordinates to have the x-axis along the surface of the plane, with up the plane as positive, and the y-axis normal to the plane, without as positive. Denoting the coefficient of static friction by us, Write an expression for the sum of the forces in the x-direction just before the block begins to slide up the inclined plane. Use defined quantities and g in your expression.

A 3.1 kg block is placed on top of a 8.22 kg block. A horizontal force of F = 55.5 N is applied to the 8.22 kg block, and the 3.1 kg block is tied to the wall. The coefficient of kinetic friction between all moving surfaces is 0.196. There is friction both between the masses and between the 8.22 kg block and the ground. The acceleration of gravity is 9.8m/s^2. Determine the magnitude of the acceleration of the 8.22 kg block. Answer in units of m/s^2.