How Do You Solve Newton's Third Law Homework Problems?

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SUMMARY

The discussion focuses on solving Newton's Third Law homework problems involving forces and tensions in a system of masses. The key equations utilized are F=ma for calculating acceleration and the relationship between tensions T1, T2, and T3. Specifically, the participant needs to determine the acceleration of the system when a force of 100.0N is applied and the force exerted when T3 equals 15.0N. The solution involves summing the masses and formulating the resultant force based on the tensions provided.

PREREQUISITES
  • Understanding of Newton's Second Law (F=ma)
  • Knowledge of tension in a system of ropes
  • Ability to calculate resultant forces
  • Familiarity with mass and gravitational force calculations (Fg = gm)
NEXT STEPS
  • Study the application of Newton's Laws in multi-body systems
  • Learn how to calculate tensions in pulley systems
  • Explore examples of force diagrams and free-body diagrams
  • Investigate the relationship between mass, force, and acceleration in practical scenarios
USEFUL FOR

Students studying physics, particularly those tackling mechanics and forces, as well as educators looking for examples of Newton's Laws in action.

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Alright, so I have this sheet for homework and I'm not sure where to start.

Incase you are unable to see, the questions say:

a) What is the acceleration of the system and the tension in each rope if the girl lifts with a force of 100.0N?
b) What is the force that she pulls with if T3 (bottom bucket) = 15.0N?

http://imageshack.us/photo/my-images/696/photowda.jpg/

To begin, I know I need to utilize the second law's equation F=ma, but I do not know which masses I am supposed to use to find Fg = gm.

I need serious help, I am completely confused!
 
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To find the acceleration of the system, you can replace the entire system by an equivalent mass M and a tension T.

So M would be the sum of the 3 masses and T would T1+T2+T3 (they told you what 'T' was in the question.)

Just formulate the resultant force and you should get it now.
 

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