How Can Net Force Be Zero When Net Torque Isn't, and Vice Versa?

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SUMMARY

The discussion clarifies the relationship between net force and net torque in physics. It establishes that net force can be zero while net torque is nonzero, exemplified by two parallel forces of equal magnitude acting in opposite directions, creating a torque without resulting in net force. Conversely, an object sliding down an incline illustrates a scenario where net torque is zero, yet net force is present due to gravitational pull. These principles are foundational in understanding rotational dynamics and equilibrium.

PREREQUISITES
  • Understanding of Newton's Laws of Motion
  • Basic knowledge of torque and its calculation
  • Familiarity with concepts of force couples
  • Knowledge of inclined plane mechanics
NEXT STEPS
  • Study the concept of torque in detail using the formula τ = r × F
  • Explore the principles of static and dynamic equilibrium
  • Learn about the effects of friction on inclined planes
  • Investigate real-world applications of torque in engineering
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Physics students, educators, and anyone interested in mechanics, particularly those studying rotational motion and equilibrium conditions.

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(a) Give an example in which the net force acting on an object is zero and yet the net torque is nonzero.


(b) Give an example in which the net torque acting on an object is zero and yet the net force is nonzero.

can b be torque= Tension(12 N)(radius 0m) ?
 
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(a) any two parallel forces with the same magnitude and opposite directions form a torque, while the net force is obvoiusly zero.

(b) consider an object sliding down an incline.
 
Last edited:
Remember that two parallel forces with the same magnitude and opposite directions have to be separated by some distance to produce a torque. These are commonly called a 'couple'.
 

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