Block on a Wedge: Solving the 0N Equation

  • Thread starter Thread starter zohapmkoftid
  • Start date Start date
  • Tags Tags
    Block Wedge
AI Thread Summary
The discussion revolves around solving the 0N equation for a block on a wedge, where the correct answer is identified as 0N, while the user initially calculated 12N. The user acknowledges that considering the block and wedge as a single system leads to the correct answer but seeks clarification on their miscalculation. Key points raised include the importance of including the entire reaction force and the friction component in the analysis. The conversation emphasizes the need for a comprehensive approach to account for all forces acting on the system. Understanding these factors is crucial for accurately solving the problem.
zohapmkoftid
Messages
27
Reaction score
1

Homework Statement


http://uploadpie.com/7kzGG

Homework Equations


The Attempt at a Solution


The correct answer is A : 0N
But my answer is B : 12 N
Here is my attempt

http://uploadpie.com/UUGwM

I know I can consider the block and the wedge as one system and I can get the correct answer. But I want to know what's wrong with this approach.
Thanks for help
 
Last edited by a moderator:
Physics news on Phys.org
Welcome to PF!

Hi zohapmkoftid! Welcome to PF! :smile:
zohapmkoftid said:
I know I can consider the block and the wedge as one system and I can get the correct answer. But I want to know what's wrong with this approach.

Yes, Rsinθ is the horizontal component of the normal component of the reaction force

But you haven't included the whole reaction force …

what about the friction component? :wink:​
 
Yes, I haven't considered f cos
thank you!
 

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

Block tied to a fixed string on an accelerating wedge
Replies
37
Views
2K
Virtual displacement for a block sliding down a wedge
Replies
3
Views
2K
A block on an accelerating wedge
Replies
4
Views
2K
Acceleration of a block on a moving wedge
Replies
6
Views
3K
Momentum conservation: block-wedge problem
Replies
4
Views
2K
Calculating the Force Required for a Moving Wedge and Block System
Replies
5
Views
2K
Block on movable wedge pulley system
Replies
5
Views
2K
Find min/max accel. for block to stay on wedge (static fric)
Replies
1
Views
2K
Maximizing Friction Coefficient for Block on a Wedge: A Calculus Approach
Replies
3
Views
2K
Block and acceleration of wedge
Replies
11
Views
6K

Hot Threads

Recent Insights

Back
Top