Number of Forces Doing Work on Box on Incline

  • Thread starter Thread starter msattar07
  • Start date Start date
  • Tags Tags
    Forces Work
AI Thread Summary
A box is being pulled up a rough incline, and the discussion centers on identifying the forces acting on it and determining how many of those forces are doing work. Participants agree that there are multiple forces at play, including normal force, friction, and the applied force from the rope. One contributor initially counted four forces but later found that the correct number is three. The emphasis is on understanding the direction of these forces and their role in doing work on the box. Clarifying the forces involved is crucial before concluding which ones contribute to the work done.
msattar07
Messages
10
Reaction score
0

Homework Statement


A box is being pulled up a rough incline by a rope connected to a pulley as shown below. The arrows indicate the direction of motion of the blocks. How many forces are doing work on the box?
(view attachement)


Homework Equations



different forces must be taken into account

The Attempt at a Solution



ok so there's the normal force, force, friction?
 

Attachments

  • Chap+6+Conc+Question+_2.jpg
    Chap+6+Conc+Question+_2.jpg
    15.4 KB · Views: 808
Physics news on Phys.org
msattar07 said:
ok so there's the normal force, force, friction?
First figure out how many forces act on the box. In what direction do they act?

Then figure out which of those forces do work on the box.

Hint: I count 4 forces acting on the box.
 
yea...i guessed that there were four forces because i was looking over another problem in my book that resembled this problem but i don't understand what the forces are..
but then i checked the answer for this problem just now..and the answer is three froces??
 
I advise you to first understand how to identify the forces that act on the box before you worry about which of them are doing work. Start listing them and specify which way they point.
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

Finding the work done by a block
Replies
4
Views
3K
Work Pulley Problem with constant speed
Replies
2
Views
1K
Block and pulley on movable incline
Replies
2
Views
2K
Physics — Net work on a box being pulled…
Replies
6
Views
2K
External forces required to move an electric dipole quasi-statically
Replies
14
Views
1K
What is the maximum tension and friction force for a block held on an incline?
Replies
19
Views
4K
Box and a Spring on on an inclined plane
Replies
11
Views
3K
3D Statics problem: Box on an inclined plane constrained by a rope
Replies
19
Views
2K
Why is the direction of kinetic/static friction up a ramp?
Replies
7
Views
1K
Block at rest on an inclined surface
Replies
36
Views
5K

Hot Threads

Recent Insights

Back
Top