Mechanics what force causes a ball rotate up an incline

[ronaldor9]

When a ball rolls down an incline without slipping friction causes the ball to rotate CCW
When a ball with an initial velocity climbs up an incline friction is now in the opposite direction as in the previous case, the problem now is which force causes the ball to rotate CW. It can't be friction because that would cause it to rotate CCW but the ball is rolling CW, could the component of gravity be causing the torque to rotate the ball CW?

 

[willem2]

Apparently you have a slope that goes upwards to the right, so the ball will go CCW if it rolls down, and CW if it rolls up.

If you launch the ball upslope and rightwards without it rotating, then the friction force on the bottom part of the ball points to the left, this will make the ball rotate more and more CW until the ball is rolling without slipping.

Once the ball is rolling without slipping, gravity will slow down the ball, so CW rotation decreases. The friction force that causes this will indeed make the ball CCW, but until the ball has stopped it will only decrease the CW rotation.

 

[kerimek]

The force that causes a ball to rotate up an incline is the component of gravity acting in the direction of the incline. When a ball rolls down an incline without slipping, the friction force acts in the opposite direction of the ball's motion, causing it to rotate counterclockwise. However, when the ball has an initial velocity and is climbing up an incline, the friction force now acts in the same direction as the ball's motion. This results in a clockwise rotation of the ball. Additionally, the component of gravity acting in the direction of the incline also contributes to the clockwise rotation by creating a torque on the ball. Therefore, both the friction force and the component of gravity play a role in causing the ball to rotate clockwise up an incline.