Free Body Diagrams & 3rd law pair forces.

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SUMMARY

This discussion focuses on understanding Free Body Diagrams (FBD) and Newton's Third Law of Motion in the context of two physics problems involving magnets and pendulums. The participant seeks clarification on the forces acting on a magnet and a pendulum, specifically identifying the third law pairs. Key points include the identification of weight and reaction forces on the magnet and tension forces on the pendulum. The participant expresses uncertainty about correctly representing these forces in their diagrams.

PREREQUISITES
  • Understanding of Newton's Third Law of Motion
  • Familiarity with Free Body Diagrams (FBD)
  • Basic knowledge of forces such as tension and weight
  • Ability to interpret physics problems involving multiple objects
NEXT STEPS
  • Study the principles of Free Body Diagrams in detail
  • Learn about Newton's Third Law and its application in various scenarios
  • Practice drawing Free Body Diagrams for different physical systems
  • Explore examples of tension forces in pendulum motion
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone seeking to improve their understanding of force interactions and Free Body Diagrams in mechanics.

JasonS
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Homework Statement



I have 2 questions from a practice test paper that I can't do (I missed the lessons) - I've attached them, the other questions I did fine. They should be quite basic but I'm not sure if what I'm doing is right (only done physics for 2 weeks). If anyone could correct my current solutions, and/or help on the others that would be great.2. The attempt at a solution

In Q1 (a) I put on weight/reaction force on the magnet... and I know that there would be another force acting on it (from the other magnet) but I don't know where to draw it, or what it would be called.

In Q1 (b) I put the reaction to weight, upwards in direction acting on the earth.

In Q2 (a) I drew tension/weight on the pendulum and just weight on the earth.

Q2 (b) I'm not really sure about.If anyone could help that would be greatly appreciated. Sorry for my English, it isn't my first language. Thanks in advance.
 

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JasonS said:
In Q1 (a) I put on weight/reaction force on the magnet... and I know that there would be another force acting on it (from the other magnet) but I don't know where to draw it, or what it would be called.

In Q1 (b) I put the reaction to weight, upwards in direction acting on the earth.
Three forces act on the magnet. What are they and in what direction do they act? What's the third law pair for each force?

In Q2 (a) I drew tension/weight on the pendulum and just weight on the earth.

Q2 (b) I'm not really sure about.
On the pendulum, two forces act. For the orbiting earth, how many forces act?
 

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