Tuesday 5 June 2018

rotational dynamics - Torque from Gravity


enter image description here


If a sphere rolls on an inclined plane, why does the component of gravity parallel to the plane not exert a torque on the sphere? Shouldn't infinitesimal mass particles experience a force of (dm)gsin(theta)? Because infinitesimal mass particles experience the force at different lengths, shouldn't they experience torques and, consequently, give rise to a net torque?


I ask this question, because the following link (starting at subheader "Perspective II")


treats friction as the only torque-contributing force applied to an object on an incline.


http://physics.bu.edu/~duffy/sc527_notes06/race.html




No comments:

Post a Comment

Understanding Stagnation point in pitot fluid

What is stagnation point in fluid mechanics. At the open end of the pitot tube the velocity of the fluid becomes zero.But that should result...