Newtons Laws applyied to pulleys

AI Thread Summary
The discussion revolves around a physics problem involving two blocks connected by a string over a massless pulley. One block weighs 416N on a table, while the other hangs off the side with a weight of 215N. Participants are encouraged to create free body diagrams (FBD) for each block to identify forces such as normal force, weight, and tension. The goal is to derive the equations of motion using the sum of forces equating to mass times acceleration (EF = ma). Assistance is sought in formulating the equations based on the drawn FBDs.
Little1
Messages
1
Reaction score
0

Homework Statement


There is a drawing with a block weight 416N on a table attached to a string that is running through a pulley at the end of the table. On the other end of the string a block that is hanging off the side of the table with a weight of 215N. Ignore all frictional effects and assume the pulley is massless. Find the acceleration of the 2 blocks and the tension of the cord.


Homework Equations


EF = ma
EFx = the sum of all the forces in the x direction
EFy= the sum of all the forces in the y direction


The Attempt at a Solution


I attempted to draw the free body diagram with all the forces labeled including the normal force, weight, and tension.
 
Physics news on Phys.org
If you can show or describe your FBD for each mass, someone will help you write the sum-of-forces = ma equation for each diagram.
 
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...
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...
Back
Top