Very basic motion law - Newton's 2nd

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SUMMARY

The discussion focuses on a physics problem involving Newton's Second Law, specifically applied to a system with a 5 kg object on a frictionless table and a 9 kg hanging object. The key equations used are F = ma, which governs the acceleration of both objects. The participants conclude that the tension in the string is crucial for understanding the acceleration of both masses, as the gravitational force acting on the 9 kg object is responsible for pulling the 5 kg object across the table. A diagram is recommended to visualize the forces at play.

PREREQUISITES
  • Understanding of Newton's Second Law (F = ma)
  • Basic knowledge of tension in strings and pulleys
  • Familiarity with concepts of mass and acceleration
  • Ability to draw and interpret free-body diagrams
NEXT STEPS
  • Study the derivation of acceleration in pulley systems with multiple masses
  • Learn about free-body diagrams and their application in mechanics
  • Explore the effects of friction in similar systems
  • Investigate the role of tension in different types of pulley configurations
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and dynamics, as well as educators looking for examples of Newton's laws in action.

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Homework Statement



a 5 kg object placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging 9 kg object. Find the acceleration of the two objects and the tension in the string.


Homework Equations



F = ma

The Attempt at a Solution



It just seems to me that if there is no friction the second object on the horizontal table should travel as the same speed that the 9.00 kg object falls. If there is no friction, then I don't see what force would be needed to "pull" the second object across the table, or how it would slow down the 9 kg object.

Thank you!
 
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2clients said:

Homework Statement



a 5 kg object placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging 9 kg object. Find the acceleration of the two objects and the tension in the string.


Homework Equations



F = ma

The Attempt at a Solution



It just seems to me that if there is no friction the second object on the horizontal table should travel as the same speed that the 9.00 kg object falls. If there is no friction, then I don't see what force would be needed to "pull" the second object across the table, or how it would slow down the 9 kg object.

Thank you!

Draw a diagram. If there is tension in the line then whatever force there is from gravity on the hanging weight will be used to accelerate both weights.
 

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