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

AI Thread Summary
The discussion focuses on a physics problem involving two blocks connected by a string over a pulley, with one block on an incline and the other hanging. The incline is at a 37-degree angle, with the hanging block weighing 16 kg and the block on the incline weighing 8 kg, while the coefficient of kinetic friction is 0.23. The user calculated the gravitational forces and friction, determining the net force of the system and an acceleration of approximately 4 m/s². They also calculated the tension in the string to be 92.8 N but expressed uncertainty about whether this value is consistent throughout the string. The conversation confirms the calculations are generally correct, emphasizing that tension remains constant in an ideal string.
rnien
Messages
4
Reaction score
0

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:
Physics news on Phys.org
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??
 
Thread 'Voltmeter readings for this circuit with switches'
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Thread 'Struggling to make relation between elastic force and height'
Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears. My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it. I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height. But the...
Back
Top