Torque vs Force: What's the Difference?

  • Context: Undergrad 
  • Thread starter Thread starter burak_ilhan
  • Start date Start date
  • Tags Tags
    Force Torque
Click For Summary
SUMMARY

Torque and force are fundamentally different concepts in physics, despite both being involved in motion. Torque, represented by the symbol τ, is associated with rotational motion and has the same units as energy, specifically joules per radian. This relationship arises from the equations for work done in translational motion, E = ∫Fdx, and in rotational motion, E = ∫τ dθ. Understanding this distinction is crucial for accurately applying these concepts in physics.

PREREQUISITES
  • Understanding of basic physics concepts, particularly motion.
  • Familiarity with the equations for work done in both translational and rotational contexts.
  • Knowledge of units of measurement in physics, specifically joules and radians.
  • Basic grasp of calculus, particularly integration.
NEXT STEPS
  • Study the relationship between torque and angular momentum in rotational dynamics.
  • Learn about the applications of torque in engineering, particularly in mechanical systems.
  • Explore the concept of moment of inertia and its impact on rotational motion.
  • Investigate the differences between static and dynamic equilibrium in physics.
USEFUL FOR

Students of physics, engineers, and anyone interested in understanding the principles of motion and mechanics, particularly in the context of rotational dynamics.

burak_ilhan
Messages
14
Reaction score
0
as you all now torque in rotational motion has similarity with force in translational motion. but torque has the same unit as energy.it seems to me that there is a problem. Any explanation you have? (please ssmt different than " they are defined that way!"
 
Last edited:
Physics news on Phys.org
In translational motion, work done (energy) is

E=\int Fdx

In the same manner, in rotational motion,

E=\int\tau d\theta

Since \inline{\theta} is dimensionless, torque \inline{\tau} has same units as energy. If it helps in keeping things apart, you can think of the units of torque as being say joules per radian.
 

Similar threads

  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 37 ·
2
Replies
37
Views
3K
  • · Replies 19 ·
Replies
19
Views
2K
  • · Replies 30 ·
2
Replies
30
Views
2K
  • · Replies 14 ·
Replies
14
Views
1K
  • · Replies 10 ·
Replies
10
Views
4K
  • · Replies 32 ·
2
Replies
32
Views
3K
  • · Replies 10 ·
Replies
10
Views
755