A mass m 1 on a horizontal shelf is attached by a thin string that passes over
Question:
A mass m1 on a horizontal shelf is attached by a thin string that passes over a frictionless peg to a 2.5- kg mass m2 that hangs over the side of the shelf 1.5 m above the ground (Figure). The system is released from rest at t = 0 and the 2.5-kg mass strikes the ground at t = 0.82 s. The system is now placed in its initial position and a 1.2-kg mass is placed on top of the block of mass m1. Released from rest, the 2.5-kg mass now strikes the ground 1.3 s later. Determine the mass m1 and the coefficient of kinetic friction between m1 and the shelf.
m2
Step by Step Answer:
The freebody diagrams s 12at 2 to find the acceleration a1 of the first run a 1 3 m 082 s 2 ...View the full answer
Fundamentals of Ethics for Scientists and Engineers
ISBN: 978-0195134889
1st Edition
Authors: Edmund G. Seebauer, Robert L. Barry
Related Video
Static friction and kinetic friction are two types of friction that occur when two objects are in contact with each other. Static friction is the force that must be overcome to initiate motion between two surfaces that are in contact with each other but are not moving relative to each other. It is caused by the interlocking of rough surfaces at the microscopic level, and it increases as the force pushing the surfaces together increases. Once motion between the surfaces starts, the static friction is no longer present. Kinetic friction, also known as sliding friction, is the force that opposes the motion of two surfaces that are in contact with each other and are moving relative to each other. It is caused by the rubbing of the surfaces against each other and the resistance of the molecules in the surfaces to being moved. Kinetic friction is generally less than static friction, but it can still be a significant force, especially at high speeds. Both static and kinetic friction can be quantified using a coefficient of friction, which is a dimensionless number that represents the ratio of the frictional force between two surfaces to the normal force (the force perpendicular to the surfaces). The coefficient of static friction is typically greater than the coefficient of kinetic friction for a given pair of surfaces, because it takes more force to overcome the interlocking of the surfaces at rest than to maintain motion once it has started.
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