Forces Involved in an Electrical Motor According to Newton's Law

Click For Summary

Discussion Overview

The discussion revolves around the forces involved in an electrical motor as interpreted through Newton's laws. Participants explore two scenarios presented by the original poster, focusing on the calculation and interpretation of forces acting on various components of the motor while dismissing friction.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • The original poster questions the correctness of their interpretation of forces in two scenarios of their motor design according to Newton's laws.
  • In Scenario 1, the original poster seeks validation of their force interpretations.
  • In Scenario 2, the original poster expresses confusion regarding the net forces acting on the motor components, particularly the relationship between the 10N and 5N forces.
  • Some participants inquire about the meaning of the force labels "10N magnet" and "5N magnet," questioning the properties that these values represent.
  • One participant suggests that the 10N and 5N forces are the forces acting against the magnet when the electromagnet is activated.
  • Another participant challenges the scenario by stating that according to Newton's 3rd law, both magnets should experience equal and opposite forces, implying that the situation described may not be physically plausible.

Areas of Agreement / Disagreement

Participants express differing views on the interpretation of forces in the scenarios. There is no consensus on whether the original poster's interpretations are correct, and the discussion remains unresolved regarding the application of Newton's laws to the described scenarios.

Contextual Notes

Participants have not fully clarified the assumptions behind the force labels or the specific configurations of the motor components, leading to potential ambiguities in the discussion.

nelson_qna
Messages
3
Reaction score
0
Hi Everyone.

I've been trying to build an electrical motor and would like know the method to actually calculate the forces exerted on several parts in the motor according to Newton's laws. I've attached some pictures and drawings of the motor I'm trying to build. There are two scenarios that I've considered. Scenario 1 (Please see drawings Scenario 1) & Scenario 2 (Please see drawing Scenario 2)

Question 1 - "According to Drawing in Scenario 1"

Is my interpretation of all the forces involved in the motor correct according to Newton's Law? (Dismissing Friction Of Course)


Question 2 - "According to Drawing in Scenario 2"

In scenario 2 is all the forces involved in the drawing of scenario 2 correct and does it violets Newton's laws?

It feels wrong as 10N is acting on the 4 bolts in the + direction and 5N is acting on the pin (Q) in the - Direction. This 2 forces should be equal according to Newton's laws. If not there will be a nett force of -5N acting on the table. I just can't see how 10N of force is transferred from the permanent magnets to point Q where the bearing pivots.

Please Explain Thank You.
 

Attachments

  • Scenario 1.jpg
    Scenario 1.jpg
    34.3 KB · Views: 545
  • Scenario 2.jpg
    Scenario 2.jpg
    41.4 KB · Views: 554
Physics news on Phys.org
Why are the magnets labeled "10N magnet" and "5N magnet". What property of the magnets is 10 and 5 Newtons?
 
The 10N & 5N are the forces acting against the magnet when the electromagnet is turned on.
 
nelson_qna said:
The 10N & 5N are the forces acting against the magnet when the electromagnet is turned on.
Maybe I'm misunderstanding your diagram but it looks like in scenario 2 you have a 10N force acting against a 5N force. According to Newton's 3rd law, this is not something that could happen in nature. Both magnets have to be experiencing the same force.
 

Similar threads

Undergrad How does permittivity in Coulomb's law work?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Spring balance analysis from a system point of view
  • · Replies 24 ·
Replies
24
Views
2K
Graduate New Explanation to How Newton's Third Law is Satisfied in Magnetism
  • · Replies 3 ·
Replies
3
Views
5K
Undergrad Question regarding the use of Electric flux and Field Lines
  • · Replies 25 ·
Replies
25
Views
3K
Undergrad Electrostatic force exerted on an electron inside a nucleus
  • · Replies 19 ·
Replies
19
Views
2K
Undergrad Confusion over electric field inside a charged shell
  • · Replies 6 ·
Replies
6
Views
5K
Undergrad Extending Newton's laws -- Is the concept of force still defined?
  • · Replies 35 ·
2
Replies
35
Views
5K
Undergrad Are Newton's Laws just definitions?
  • · Replies 11 ·
Replies
11
Views
2K
High School What is the Absolute Value of the Normal force on a block on this wedge?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Griffith, Electrodynamics, 4th Edition, Example 4.8. (Second part)
  • · Replies 3 ·
Replies
3
Views
939