Question on working out forces acting on a brick.

  • Thread starter Thread starter nxtgenlva
  • Start date Start date
  • Tags Tags
    Forces
AI Thread Summary
The discussion focuses on calculating the forces acting on a brick, specifically addressing the net force as ƩF=f1-f2, resulting in 22.19N acting downward. The participant expresses confidence in their calculations but seeks validation from others. Concerns about friction are raised, particularly regarding its impact when the brick is pulled. However, it is clarified that friction is not relevant to the specific question being addressed. The conversation emphasizes the importance of understanding the forces involved in physics problems.
nxtgenlva
Messages
3
Reaction score
0
http://imgur.com/MyxXW

Attempt at solution for the last question:
ƩF=f1-f2
Ʃf=25-2.81=22.19N
The force is acting downwards, towards the center of the earth.

Could you lovely people check this over and check if I have it right? Because I have a bad feeling about it.
 
Last edited:
Physics news on Phys.org
As far as I can see, it looks right to me.
 
Woohoo! I'm not going to fail A-level physics! Thanks man.
 
What about the friction? Imagine they put the brick on your arm. You would feel a downward force as you have calculated, yes. But if they started pulling the brick, would you feel your arm being pulled too, assuming that there was significant friction?
 
Friction has nothing to do with what the last question is asking.
 

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 »

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 'A bead-mass oscillatory system problem'

Thread 'A bead-mass oscillatory system problem'

I can't figure out how to find the velocity of the particle at 37 degrees. Basically the bead moves with velocity towards right let's call it v1. The particle moves with some velocity v2. In frame of the bead, the particle is performing circular motion. So v of particle wrt bead would be perpendicular to the string. But how would I find the velocity of particle in ground frame? I tried using vectors to figure it out and the angle is coming out to be extremely long. One equation is by work...
View full post »

Similar threads

To find the resultant of forces on a lamina
Replies
5
Views
3K
Understanding The Concept Of Moments
Replies
6
Views
2K
What's the Total Force Exerted on the Skater?
Replies
4
Views
1K
Multiple Forces Acting on Masses Attached by a String
Replies
5
Views
3K
What Is the Average Force Exerted by a Ball on a Plate During Impact?
Replies
5
Views
3K
Hydrostatics Pressure - Finding thrust and resultants
Replies
1
Views
2K
What is the Normal Force in Terms of Mass on a Ski Jump Training Hill?
Replies
2
Views
2K
Applying Newton's laws to find forces
Replies
8
Views
14K
Calculate the forces and the work
Replies
2
Views
2K
Calculation of work done by a variable force
Replies
8
Views
4K

Hot Threads

Recent Insights

Back
Top