Homework Help: Dropping a Ball on a Frictionless Plane

1. Nov 10, 2009

mckaiju

1. The problem statement, all variables and given/known data

A ball is dropped from 10m at a speed of 0m/s. Ground is a frictionless plane (0, 0, 0) with a normal of (0, 0, 1). Ground absorbs 20% of incoming velocity. Find position of ball after 20 seconds.

2. Relevant equations

If the ball hits a frictionless plane would it even bounce, or would it hit take the 20% velocity reduction and go for remaining seconds.

3. The attempt at a solution

So after ball hitting ground I am calculating it having a velocity of 7.70m/s, after taking 10 seonds to hit ground and then taking the 20% reduction. This is assuming it doesnt bounce and is going to roll at the 7.70m/s for the remaining seconds.

thanks

2. Nov 10, 2009

Tzim

how is it going to roll if it is frictionless?

3. Nov 10, 2009

mckaiju

If it was frictionless, wouldn't it roll better, it would have no friction acting upon it to slow it down. right? or am I misunderstanding the of a frictionless?

4. Nov 10, 2009

Tzim

If it is frictionlss there is no force that has a torque.So it cannot roll.I think so