The discussion revolves around the coefficient of restitution and its application to the normal velocity component during a collision, specifically in the context of a ball bouncing off a wall. Participants are exploring the implications of this concept and how it relates to the velocities involved in the collision.
The conversation is actively exploring different interpretations of the coefficient of restitution and its application. Some participants have provided insights into the mechanics of the collision, while others are seeking clarification on the assumptions regarding friction and velocity components.
There are assumptions being made about the absence of friction between the ball and the wall, which influences the analysis of the collision. The complexity of oblique bouncing with friction is also noted, indicating that the discussion is considering various scenarios that could affect the outcome.
Why only to normal velocity?PeroK said:
Because the energy lost is in the compression and subsequent expansion of the object, and the extent of the compression depends on the velocity component normal to the contact surface.Vladimir_Kitanov said:
Resolve the initial velocity into components.Vladimir_Kitanov said:
Yes, and that.malawi_glenn said:
Oblique bouncing with friction is quite complicated. Assuming no slipping, as the ball compresses, the frictional component of the reaction force exerts a torque about the ball's centre, causing it to start rotating. So now we have rolling resistance as a new part of the ball starts to compress and a corresponding part starts to decompress.malawi_glenn said: