Calculating the Force Needed to Pull a Block

Click For Summary

Homework Help Overview

The problem involves calculating the force needed to pull a block at constant velocity, taking into account the weight of the block, the friction force acting on it, and the angle of the pulling force above the horizontal. The subject area includes dynamics and forces.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the use of vector components to resolve forces, question the application of the weight of the block in the context of the problem, and suggest drawing a free body diagram to visualize the forces involved.

Discussion Status

The discussion is ongoing, with participants providing guidance on visualizing the problem through diagrams and clarifying the roles of different forces. There is an emphasis on understanding the setup rather than reaching a conclusion.

Contextual Notes

Participants note the weight of the block and the friction force, as well as the constant velocity condition, which implies that the net force is zero. There is a mention of the gravitational acceleration but no specific values are resolved into a final answer.

HodaM
Messages
6
Reaction score
0

Homework Statement


A block with eight of 455 N is being pulled at constant velocity by a force directed at 30 degrees above the horizontal. The friction force on the crate is 1163 N. What is the magnitude of the pulling force?

Homework Equations


Ft= kx
Fnet= ma


The Attempt at a Solution


I tried to use the component method to find the force in the x direction and then so that I could find the pulling force but it doesn't work!
 
Physics news on Phys.org
What, specifically, did you try?
 
I tried using 445 N cos 30 degree to find the vector on the x direction, that's how I was taught!
 
445 N is the weight of the block, which acts vertically downwards, so I'm not sure why you're resolving that into the x direction.

You have several pieces of information: the block has a weight of 445N; it is traveling at constant velocity; the pulling force is 30 degrees above the horizontal; the friction acting on the box is 1163N.

So, first things first, I would draw a free body diagram including all the forces. Can you do this?
 
sure, I do

and I did draw it

so to the left is the friction force

and 30 degrees above the horizontal is the acting force

the gravity is 9.81 and from there I can find the mass of the object

and I have to find the pulling force

thank you very much for you help

I will try my best and see what I get
 

Similar threads

Replies
2
Views
2K
Replies
6
Views
1K
Replies
13
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
Replies
2
Views
867
  • · Replies 4 ·
Replies
4
Views
3K
Replies
7
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 7 ·
Replies
7
Views
2K
Replies
7
Views
3K