Friction and tensions with two blocks on a string on an incline

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Homework Help Overview

The problem involves two blocks connected by a string over a pulley, with one block on an inclined plane and the other hanging. The blocks have specified masses and the incline has a defined angle. The scenario includes kinetic friction affecting the block on the incline.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate forces acting on the blocks, including gravitational and frictional forces, and is working towards finding acceleration and tension in the string. Some participants question the angle of inclination and its impact on calculations.

Discussion Status

The discussion is ongoing, with the original poster seeking confirmation on their calculations and understanding of tension in the string. There is a focus on ensuring all relevant factors, such as the angle of the incline, are considered.

Contextual Notes

The original poster has provided specific values for masses, friction coefficient, and incline angle, but there may be uncertainties regarding the calculations of tension and whether it varies along the string.

rnien
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Homework Statement


Two blocks are connected by a string over a frictionless, massless pulley such that one is resting on an inclined plane and the other is hanging over the top edge of the plane. the hanging block has a mass of 16 kg and the one on the plane has a mass of 8 kg. the coefficient of kinetic friction between the block and the inclined plane is 0.23. the blocks are released from rest.
Edit: The incline is at an angle of 37 degrees.

a. what is the acceleration of the blocks?
b. what is the tension in the string connecting the blocks?

Homework Equations


Ffr=Coefficient x Fn
A= Fnet / Mass

The Attempt at a Solution


I solved for the Fgx and the Fgy using cos and sine. I got Fgx= 47.18 N, and for Fgy= 62.6 N. I solved for Force of friction using equations above and got 14.4 N. Also I found the Fg for the 16 kg block to be 156.8. So I found Fnet of the whole system = 95.22. Divided by mass of 24 gives an acceleration of 4 m/s2 (I think ?)

For tension, so far I have figured the tension of the string of just the 16 kg block to be 92.8 N ? Not sure where to go now..
 
Last edited:
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It seems that you're doing it right, but what's the angle of inclination of the plane? You seem to have forgotten to tell us this.
 
Oops, sorry, the incline is at an angle of 37 degrees.
 
Then I think your calculations are fine.
 
Okay thank you! But is my tension right? I found tension for the string above the hanging block to be 92.8 N but I'm confused as to if I have to add anything to this? or the tension is the same throughout the string??
 

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