Determining Force applied so mass will stay at rest

AI Thread Summary
To keep a mass of 12.5 kg at rest, a force must counteract its weight, calculated as 122.5 N using the formula W = mg. Participants suggest drawing a free body diagram of the pulley above the mass to analyze the forces involved. The tension in the rope must equal the weight of the mass for it to remain stationary. Understanding the equilibrium of forces acting on the pulley is crucial to solving the problem. Proper analysis will reveal the necessary force to maintain the mass at rest.
uazaga
Messages
11
Reaction score
0
A weight of mass 12.5 Kg hangs from very light pulleys as shown in fig. What force must be applied to the rope so that the mass stays at rest.

M=12.5 Kg
W=mg
a=g=9/8 m/s^2

M=12.5 Kg
W = mg = 12.5 x 9.8 = 122.5 N
I've done this much but I have no clue what to do now. Can someone please help me out?
 

Attachments

  • Untitled.jpg
    Untitled.jpg
    7.6 KB · Views: 428
Last edited:
Physics news on Phys.org
the figure doesn't show, therefore i am unable to help u, if u want u can send it to my email so i can try it. its [email address deleted by moderator]
 
Last edited by a moderator:
Can you find the tension in each part of the rope and relate it to the weight you have calculated? Hint: Draw a free body diagram of the pulley that is directly over the hanging mass. If that pulley is at rest, what must be true about the forces acting on it?
 
Last edited:

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Similar threads

A cylinder connected to a hanging mass
Replies
21
Views
335
Distribution of Energy when work is done on a system of 2 masses connected by a spring
Replies
17
Views
2K
Calculating acceleration of a prism and block connected to a wall through a rope and pulley
Replies
4
Views
395
Finding the Force Applied by a Support on a Falling Chain
Replies
2
Views
2K
Newton's law problem: Pushing 2 stacked blocks on a horizontal table
Replies
13
Views
3K
Calculating Applied Force for a Moving Block on a Table
Replies
9
Views
4K
Calculating Net Force of 3 Blocks in an Elevator
Replies
9
Views
2K
Force applied on the pulley of a system
Replies
8
Views
3K
Find the force to push a book sideways on a table
Replies
2
Views
2K
Balancing a Seesaw: Finding Mass with Torque
Replies
7
Views
10K

Hot Threads

Recent Insights

Back
Top