Two stacked boxes and a pulley with a weight attached

AI Thread Summary
The discussion focuses on a physics problem involving two stacked boxes and a pulley system. The goal is to determine the maximum mass for M3 that prevents mass one from sliding off mass two, given specific weights and coefficients of static friction. Calculations reveal the static friction force between the blocks and the table, which are essential for solving the problem. The equations of motion are set up to analyze the forces acting on the system, emphasizing the importance of expressing calculations in terms of variables before substituting numerical values. The conversation highlights the need for clarity in problem-solving and the application of fundamental physics principles.
donveppy
Messages
1
Reaction score
0

Homework Statement


The system shown is released from rest. Mass one (0.450 kg) rests on mass two (0.820 kg) and the coefficient of static friction between the two masses is 0.560 and the same for the mass and the table. Determine the maximum mass for M3 such that the mass one will not slide on mass two. The string can be considered massless and the pulley is frictionless

Homework Equations


fs=uk(n)
sumF=M(a)

The Attempt at a Solution


.450(9.8)(.560)= 2.46N static friction force between block one and two

(.450+.560)(9.8)(.560)= 6.96N static friction force between both blocks stacked and table

T-(6.96N)=M(1+2)(a) sum forces x direction

w2- T=M2(a) sum forces in y direction
 
Physics news on Phys.org
System shown ? Shown where ?

Oh, and: welcome to PF!

Tip: don't write calculations with numbers. Instead write expressions with variables and work with those. Only at the last step fill in values (i a numerical answer is required).
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Pulley with friction, how to get the friction in the pulley?
Replies
23
Views
2K
Newton's Second Law (Pulley Sustem)
Replies
3
Views
2K
Static Friction Required to Keep the System from Moving (Two Boxes)
Replies
16
Views
2K
Newton's law problem: Pushing 2 stacked blocks on a horizontal table
Replies
13
Views
3K
Frictional Forces: Stacked boxes, pulley with weight.
Replies
1
Views
7K
Ideal Vs Real Mass Pulley system
Replies
10
Views
5K
Two blocks, a fixed pulley and friction
Replies
4
Views
3K
Explain friction in a pulley system
Replies
13
Views
7K
Pulley and Two Masses -- Newton's Law of Motion
Replies
1
Views
3K
Force problem with three masses and two pulleys
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top