A force P pulls a series of blocks initially at rest as shown in the figure where all cords are frictionless and incompressible, and all pulleys are frictionless. The 8-kg Block 1 is attached to a 5-kg Block 2. The coefficients of friction between Block 1 and the horizontal surface are 0.38 (static) and 0.27 (kinetic), while between Block 2 and the surface inclined at 28° are 0.40 (static) and 0.31 (kinetic). a. Determine the angle θ at thich Block 1 is being pulled to just get it moving if force P is 71.2 N. b. If the blocks are pulled with a force of 100 N at the same angle, how fast are the blocks moving after 3 seconds? c. What is the total distance travelled?

A force P pulls a series of blocks initially at rest as shown in the figure where all cords are frictionless and incompressible, and all pulleys are frictionless. The 8-kg Block 1 is attached to a 5-kg Block 2. The coefficients of friction between Block 1 and the horizontal surface are 0.38 (static) and 0.27 (kinetic), while between Block 2 and the surface inclined at 28° are 0.40 (static) and 0.31 (kinetic). a. Determine the angle θ at thich Block 1 is being pulled to just get it moving if force P is 71.2 N. b. If the blocks are pulled with a force of 100 N at the same angle, how fast are the blocks moving after 3 seconds? c. What is the total distance travelled?

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.3P: Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair...

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Concept explainers

Basic Terminology in Mechanics

The area of science and mathematics concerned the motion of the objects, the relation between the force matter, and motion if specified. Forces exerted over the objects result in displacements or changes in the position of an object concerning its environment. This branch of physics keeps its roots in Ancient Greece in the form of the scripts of Aristotle and Archimedes.

Question

A force P pulls a series of blocks initially at rest as shown in

the figure where all cords are frictionless and incompressible, and

all pulleys are frictionless. The 8-kg Block 1 is attached to a 5-kg

Block 2. The coefficients of friction between Block 1 and the

horizontal surface are 0.38 (static) and 0.27 (kinetic), while

between Block 2 and the surface inclined at 28° are 0.40 (static)

and 0.31 (kinetic).

a. Determine the angle θ at thich Block 1 is being pulled to just get it moving if force P is

71.2 N.

b. If the blocks are pulled with a force of 100 N at the same angle, how fast are the blocks

moving after 3 seconds?

c. What is the total distance travelled?

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