Register to reply 
Returning ball (kinematics) 
Share this thread: 
#1
Nov2410, 02:33 PM

P: 97

Hello!
Can someone help me define the necessary condition in which the ball returns back to the thrower? a,b and c are angles. The changeable value can be either a,b or V0, irrelevant. I don't know if there is a condition concerning the angle b, should it be 90°? In that case if a=0 the ball would just continue jumping at the spot where it hits the ground. (the dotted line should represent the parabolic flight, haven't figured out jet how to draw that nicely :) ) 


#2
Nov2510, 09:05 AM

Sci Advisor
HW Helper
Thanks
P: 26,160

hello pinsky!
the ball doesn't have to follow the same path to return to the thrower anyway, what is the coefficient of restitution (the amount of energy lost ono the bounce)? or is it completely elastic? 


#3
Nov2510, 09:55 AM

P: 97

Hello tim
The ball is completely elastic. I now see that i forgot to mention, i'm looking for the condition in which the ball returns in one bounce. (lets say that a and v0 are constants) I suppose one could also define a relation between the number of bounces and the angle b , me not being the one :) . 


#4
Nov2510, 10:26 AM

Sci Advisor
HW Helper
Thanks
P: 26,160

Returning ball (kinematics)
ok, then a 90° angle should return the ball over the same path
but there may be another solution … there are usually two angles for which a given speed will have a given range, so i suppose it could bounce in at one angle and out at the other (but i haven't done the maths to check it) 


Register to reply 
Related Discussions  
Kinematics of a ball and track  Classical Physics  4  
Kinematics of ball rolling motion  Introductory Physics Homework  4  
Kinematics ball throwing question  Introductory Physics Homework  3  
Kinematics ball thrown  Introductory Physics Homework  3  
TwoDimensional Kinematics: Ball on a string  Introductory Physics Homework  10 