a sphere performs pure rolling upon an inclined plane with inclination "theeta " with the horizontal . what is the direction of frictional force when it performs pure rolliing up the plane and then comes down the plane performing pure rolling this time too ???!!!
2006-11-04 04:19:23 · 3 answers · asked by sham 1 in Science & Mathematics ➔ Physics
PLEASE JUSTIFY UR ANSWER AS WELL !!!
2006-11-04 04:19:53 · update #1
assuming the sphere rolls and never slides, which would cause it to lose its translational as well as rotational kinetic energies, the direction of frictional force going up the plane is downward, while the direction of frictional force going down the plane is upward.
that is because the plane provides the sphere with the friction to travel in the opposite direction.
2006-11-04 05:36:13 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Assume the incline slopes down and to the left. If the ball were going up a frictionless incline, the ball's CCW rotation would continue even when it comes to a stop. But friction does stop the rotation, so the direction must have been up the slope.
When the ball starts going downslope, it starts to rotate CW. Friction is the reason it has to rotate instead of sliding down, so again, friction is a force upslope.
2006-11-04 12:49:52 · answer #2 · answered by sojsail 7 · 0⤊ 0⤋
If I could think of a purpose for this question then I could think of a purpose to answer it.
2006-11-04 12:23:16 · answer #3 · answered by Jester17 2 · 0⤊ 1⤋